Academic literature on the topic 'Gravimetric observations'
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Journal articles on the topic "Gravimetric observations"
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Bogusz, J. "Environmental Influences on Gravimetric Earth Tides Observations." Artificial Satellites 42, no. 1 (2007): 41–57. http://dx.doi.org/10.2478/v10018-007-0016-2.
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Environmental Influences on Gravimetric Earth Tides Observations The following article presents the results of the adjustment (by means of the classical least squares method) of 3-year series of gravimetric Earth tides observations recorded in Observatory at Jozefoslaw (Józefosław - Poland) using LaCoste&Romberg model ET-26 gravimeter. The set of atmospheric data (pressure, temperature and humidity) has been taken into account in the analysis. Several models of ocean's tides were compared to find out how large the indirect effect in Jozefoslaw is. Hydrological observations were made parallel to the gravity storage (soil moisture, water table changes, and rainfalls) to specify its influence to the gravity. Joint adjustment allowed us to determine reliable and precise model of gravimetric Earth tides for Jozefoslaw, which is an indispensable element for every geodynamical observatory. From 3-year data series we were able to obtain parameters (amplitude factor and phase shift) for 31 tidal components. The accuracy of single observation after adjustment (4.2 nm/s^2) and the drift (-4.5 nm/s^2 per month) are acceptable for this type of equipment. It is worth indicating that these observations are one of the most accurate that have ever been carried out in Poland.
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ETEJE, S. O., O. F. ODUYEBO, and S. A. OLULADE. "Procedure for the Determination of Local Gravimetric-Geometric Geoid Model." International Journal of Advances in Scientific Research and Engineering (ijasre) 4, no. 8 (2018): 206–14. https://doi.org/10.5281/zenodo.2525708.
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As the surface adopted for geodetic computation is a mathematical surface which is different from the physical surface, the geoid adopted as a reference for the vertical coordinate system, the ellipsoidal heights obtained from GPS observation are transformed to practical heights known as orthometric heights. The transformation of the ellipsoidal heights to orthometric heights requires the knowledge of the geoid-ellipsoid separation at the point of observation. Since the geometric method requires the computation of geoid heights of points from GPS observation and geodetic leveling carried out over long distances which are labor intensive and prone to human errors, the accurate geoid heights of the points should be obtained from gravity measurement and a geometric geoid surface fitted to the gravimetric geoid heights. This paper presents detailed procedures for determining local gravimetric-geometric geoid model of an area or a region. The detailed procedures which consist of selection of suitable/evenly distributed points, DGPS and gravity observations of selected points, processing of DGPS and gravity observations, computation of gravimetric geoid heights of the points, fitting of geometric geoid surface to the computed gravimetric geoid heights and computation of accuracy of the geoid model are presented in sequential order.
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Budanov, L. M., N. P. Senchina, O. M. Shnyukova, and G. D. Gorelik. "Study of paleochannels by means of gravimetric observations." Geosystems of Transition Zones 4, no. 3 (2020): 288–96. http://dx.doi.org/10.30730/gtrz.2020.4.3.288-296.
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Pettersen, Bjørn Ragnvald. "A historical review of gravimetric observations in Norway." History of Geo- and Space Sciences 7, no. 2 (2016): 79–89. http://dx.doi.org/10.5194/hgss-7-79-2016.
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Abstract. The first gravity determinations in Norway were made by Edward Sabine in 1823 with a pendulum instrument by Henry Kater. Seventy years later a Sterneck pendulum was acquired by the Norwegian Commission for the International Arc Measurements. It improved the precision and eventually reduced the bias of the absolute calibration from 85 to 15 mGal. The last pendulum observations in Norway were made in 1955 with an instrument from Cambridge University. At a precision of ±1 mGal, the purpose was to calibrate a section of the gravity line from Rome, Italy, to Hammerfest, Norway. Relative spring gravimeters were introduced in Norway in 1946 and were used to densify and expand the national gravity network. These data were used to produce regional geoids for Norway and adjacent ocean areas. Improved instrument precision allowed them to connect Norwegian and foreign fundamental stations as well. Extensive geophysical prospecting was made, as in other countries. The introduction of absolute gravimeters based on free-fall methods, especially after 2004, improved the calibration by 3 orders of magnitude and immediately revealed the secular changes of the gravity field in Norway. This was later confirmed by satellite gravimetry, which provides homogeneous data sets for global and regional gravity models. The first-ever determinations of gravity at sea were made by pendulum observations onboard the Norwegian polar vessel Fram during frozen-in conditions in the Arctic Ocean in 1893–1896. Simultaneously, an indirect method was developed at the University of Oslo for deducing gravity at sea with a hypsometer. The precision of both methods was greatly superseded by relative spring gravimeters 50 years later. They were employed extensively both at sea and on land. When GPS allowed precise positioning, relative gravimeters were mounted in airplanes to cover large areas of ocean faster than before. Gravimetry is currently being applied to study geodynamical phenomena relevant to climate change. The viscoelastic postglacial land uplift of Fennoscandia has been detected by terrestrial gravity time series as well as by satellite gravimetry. Corrections for local effects of snow load, hydrology, and ocean loading at coastal stations have been improved. The elastic adjustment of present-day melting of glaciers at Svalbard and in mainland Norway has been detected. Gravimetry is extensively employed at offshore oil facilities to monitor the subsidence of the ocean floor during oil and gas extraction.
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Breili, Kristian, and Bjørn Ragnvald Pettersen. "Effects of surface snow cover on gravimetric observations." Journal of Geodynamics 48, no. 1 (2009): 16–22. http://dx.doi.org/10.1016/j.jog.2009.04.001.
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Eteje, S. O., O. F. Oduyebo, and M. N. Ono. "Comparison of Three Gravimetric-Geometric Geoid Models for Best Local Geoid Model of Benin City, Nigeria." International Journal of Advanced Engineering Research and Science (IJAERS) 6, no. 12 (2019): 261–72. https://doi.org/10.22161/ijaers.612.23.
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The conversion of geometric as well as ellipsoidal heights from GNSS observations to practical heights for engineering constructions has necessitated the determination of the local geoid model of areas. Benin City is a developing area which requires a local geoid model for conversion of geometric heights to orthometric heights for physical developments in the area. This paper is on the best local geoid model of Benin City, Nigeria by comparing three gravimetric-geometric geoid models of the study area. GNSS and gravimetric observations were carried out on 49 points to respectively obtain their coordinates and absolute gravity values. The theoretical gravity values of the points were computed on the Clarke 1880 ellipsoid, subtracted from the absolute gravity values and corrected for the air (free air) to obtain the free air gravity anomalies of the points. The computed free air gravity anomalies were applied to compute the geoid heights of the points using the integration of the modified Stokes integral. Three geometric geoid surfaces (plane, second degree and third degree surfaces) were fitted to the computed gravimetric geoid heights using the least squares technique to obtain the gravimetric-geometric geoid models of the study area. The RMSE of the three gravimetric-geometric geoid models were computed to determine their (the models) accuracy. The three gravimetric-geometric geoid models were compared using their accuracy to obtain the most suitable geoid model of the study area. The results of the comparison showed that the third degree gravimetric-geometric geoid model is most suitable for application in the study area. It is recommended that ellipsoidal heights obtained from GNSS observation within Benin City, Nigeria should be converted to orthometric heights using the third degree geoid model.
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Glegola, M., P. Ditmar, R. G. G. Hanea, F. C. C. Vossepoel, R. Arts, and R. Klees. "Gravimetric Monitoring of Water Influx Into a Gas Reservoir: A Numerical Study Based on the Ensemble Kalman Filter." SPE Journal 17, no. 01 (2011): 163–76. http://dx.doi.org/10.2118/149578-pa.
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Summary Water influx into gas fields can reduce recovery factors by 10–40%. Therefore, information about the magnitude and spatial distribution of water influx is essential for efficient management of waterdrive gas reservoirs. Modern geophysical techniques such as gravimetry may provide a direct measure of mass redistribution below the surface, yielding additional and valuable information for reservoir monitoring. In this paper, we investigate the added value of gravimetric observations for water-influx monitoring into a gas field. For this purpose, we use data assimilation with the ensemble Kalman filter (EnKF) method. To understand better the limitations of the gravimetric technique, a sensitivity study is performed. For a simplified gas-reservoir model, we assimilate the synthetic gravity measurements and estimate reservoir permeability. The updated reservoir model is used to predict the water-front position. We consider a number of possible scenarios, making various assumptions on the level of gravity measurement noise and on the distance from the gravity observation network to the reservoir formation. The results show that with increasing gravimetric noise and/or distance, the updated model permeability becomes smoother and its variance higher. Finally, we investigate the effect of a combined assimilation of gravity and production data. In the case when only production observations are used, the permeability estimates far from the wells can be erroneous, despite a very accurate history match of the data. In the case when both production and gravity data are combined within a single data assimilation framework, we obtain a considerably improved estimation of the reservoir permeability and an improved understanding of the subsurface mass flow. These results illustrate the complementarity of both types of measurements, and more generally, the experiments show clearly the added value of gravity data for monitoring water influx into a gas field.
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Pivetta, Tommaso, Carla Braitenberg, Franci Gabrovšek, Gerald Gabriel, and Bruno Meurers. "Gravity as a tool to improve the hydrologic mass budget in karstic areas." Hydrology and Earth System Sciences 25, no. 11 (2021): 6001–21. http://dx.doi.org/10.5194/hess-25-6001-2021.
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Abstract. Monitoring the water movements in karstic areas is a fundamental but challenging task due to the complexity of the drainage system and the difficulty in deploying a network of observations. Gravimetry offers a valid complement to classical hydrologic measurements in order to characterize such systems in which the recharge process causes temporarily accumulation of large water volumes in the voids of the epi-phreatic system. We show an innovative integration of gravimetric and hydrologic observations that constrains a hydrodynamic model of the Škocjan cave system (Slovenia). We demonstrate how the inclusion of gravity observations improves water mass budget estimates for the Škocjan area based on hydrological observations only. Finally, the detectability of water storage variations in other karstic contexts is discussed with respect to the noise performances of spring and super-conducting gravimeters.
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Bychkov, S. G., G. V. Prostolupov, A. A. Simanov, V. V. Khokhlova, and G. P. Shcherbinina. "IDENTIFICATION OF NATURAL AND TECHNOGENIC DECOMPACTED ZONES IN THE WORKED-OUT MASSIF BASED ON HIGH-PRECISION GRAVIMETRIC OBSERVATIONS." Bulletin of Kamchatka Regional Association «Educational-Scientific Center». Earth Sciences 2(58) (2023): 101–14. http://dx.doi.org/10.31431/1816-5524-2023-2-58-101-114.
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The paper presents the results of gravimetric studies at the potassium salt deposit in order to obtain information on the development of negative engineering-geological processes in the rock mass caused by subsoil development. A methodology was developed for high-precision monitoring gravimetric observations, which makes it possible to determine the change in the field over time. A physico-geological model of gravimetric monitoring, representing a homogeneous geological medium with an isolated area in which rock density changes have occurred, has been created. For the purposes of gravimetric monitoring, a method for processing and interpreting dynamic gravity anomalies based on the synthesis of qualitative and quantitative methods for extracting geological information from gravimetric data has been adapted. The result of the interpretation is the area of distribution, the probable interval of depths of rock decompaction, as well as the magnitude of the change in rock density, which characterizes the intensity of the process of decompaction. Examples are given of testing the developed technology for dividing decompressed zones into natural and man-made zones at the Verkhnekamskoye potash deposit in order to improve the safety of its operation. It is shown that the results of monitoring gravimetric observations can predict areas of dangerous geological processes and control subsidence of the earth's surface.
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Odenwald, Sten F., and Cait M. Bailey. "Gravimetric Detection of Earth’s Rotation Using Crowdsourced Smartphone Observations." IEEE Access 7 (2019): 148131–41. http://dx.doi.org/10.1109/access.2019.2940901.
Full textDissertations / Theses on the topic "Gravimetric observations"
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Thomas, Gregory Shane. "Observations of the tapered element oscillating microbalance as compared to a gravimetric method for particulate matter measurement." Morgantown, W. Va. : [West Virginia University Libraries], 2008. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=6048.
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Thesis (M.S.)--West Virginia University, 2008.<br>Title from document title page. Document formatted into pages; contains vi, 78 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 42-44).
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Mahed, Gaathier. "Analysis of temporal and spatial variations in water storage by means of gravimetric and hydrologic methods in the region around the South African gravimetric observation station." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/6714.
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This work examines the use of gravity data and its application to subsurface water reservoirs in the immediate vicinity of the South African Geodynamic Observatory, Sutherland (SAGOS), situated in a semi-arid region of the Karoo region of South Africa, and underlain by the Karoo sedimentary rocks intruded by dolerite dykes and sills. SAGOS houses the only supergravity metre (SG) in Africa, and this thesis sets out to test its use in monitoring groundwater dynamics using hydrological and gravity data. The main aim of this work is the application of the SG data, in conjunction with hydrological data, to better understand episodic recharge of subsurface reservoirs. The importance of water as a resource, globally and specifically the Karoo, is reviewed in conjunction with supply and demand of water. This is to contextualise the socio-economic, technical as well as policy issues related to water resource management. Applicable technologies for water resource management and efficient water use are highlighted and the application of gravity to hydrology is introduced, including satellite as well as ground based tools. In addition, arid zone hydrology as well as recharge and its mechanisms are analysed in order to better understand these processes when examined from gravity measurements. Issues related to understanding flow within the vadose zone as well as in secondary aquifers are examined, and gravity residuals and subsurface hydrology are highlighted. Thereafter, a conceptual groundwater flow modelof the study area is developed using multiple tools. First, the geology around SAGOS was mapped using SPOT 5 imagery and then ground truthed. Second, stable isotopes and water chemistry analysis was undertaken on water samples from selected boreholes. The results allude to preferential flow acting as the main mechanism for groundwater recharge. Follow-up pump-tests illustrate that fracture connectivity is greatest at close proximity to the dyke. Soil mapping, using aerial photography was also undertaken. Duplex soils, enriched with clay at depth, dominate the study area. Using in-situ infiltration tests, it is shown that the alluvium, which lines the river beds, has a higher hydraulic conductivity than the other soils, confirming that these streams act as preferential conduits for subsurface recharge. Precipitation events were correlated against gravity residuals at 4 wells, over different time periods. The results are examined using time series analyses. Gravity residuals from well SA BK07, over a period of 24 hours after the rainfall event, delineate instances of negative correlations, as well as strong positive correlations (of up to 0.9). On the whole however, correlations between gravity and groundwater at SA BK07 are variable and weak, and in conjunction with water level measurements and water chemistry, the data suggest that this well is located in a dynamic conduit (throughflow) and not in a permanent groundwater reservoir. By contrast, other wells show strong positive correlations between gravity residuals and water levels following episodic recharge events for a later time series. Correlations between the water levels and gravity residuals in wells SA BK04, SA BK05 and SA BK 01 are in excess of 0.7 for specific rainfall events. In summary, the results suggests that gravity is an excellent tool for measuring episodic groundwater recharge within the immediate vicinity of the SAGOS. This implies that gravity can aid in monitoring groundwater losses/gains in arid and semi-arid areas. Recommendations for future work are highlighted at the end; these include the possible use of hydrological modelling of reservoirs at various scales and then comparing these results to the SG as well as GOCE and GRACE satellites data, and then improving numerical modelling of the groundwater dynamics for sites like Sutherland and the surrounding arid Karoo region, where sparse water shortages, and potential pollution related to fracking for shale-gas, are likely to compete with established water needs for farming and human consumption. It is also suggested that the gravity modelling be examined to better understand site specific scenarios and thus aid in improving the processing of the gravity signal.
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Saraswati, Anita Thea. "Development of a Numerical Tool for Gravimetry and Gradiometry Data Processing and Interpretation : application to GOCE Observations." Thesis, Montpellier, 2018. http://www.theses.fr/2018MONTG077/document.
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Aujourd’hui, la communauté scientifique dispose de jeux de données gravimétriques avec une précision et une résolution spatiale sans précédent qui améliorent nos connaissances du champ gravitationnel terrestre à différentes échelles et longueurs d’ondes, obtenues de mesures du sol à des satellites. Parallèlement à la gravimétrie, l’avancement des observations par satellite fournit à la communauté des modèles d’élévation numérique plus détaillés pour refléter la géométrie de la structure terrestre. Ensemble, ces nouveaux jeux de données offrent une excellente occasion de mieux comprendre les structures et la dynamique de la Terre à l’échelle locale, régionale et mondiale. L'utilisation et l'interprétation de ces données de haute qualité exigent le raffinement des approches standards dans le traitement et l'analyse des données liées à la gravité. Cette thèse consiste en une série d’études visant à améliorer la précision du traitement des données de gravité et gravité de gravité gradients pour les études géodynamiques. Pour ce faire, nous développons un outil, appelé GEEC (Gal Eötvös Earth Calculator), pour calculer précisément les effets gravimétriques dues à tout corps de masse, indépendamment de sa géométrie et de sa distance par rapport aux mesures. Les effets de gravité et des gravité gradients sont calculés analytiquement en utilisant la solution intégrale linéaire d'un polyèdre irrégulier. Les validations aux échelles locale, régionale et mondiale confirment la robustesse des performances du GEEC, où la résolution du modèle, qui dépend à la fois de la taille de la masse corporelle et de sa distance par rapport au point de mesure, contrôle fortement la précision des résultats. Nous présentons une application pour évaluer les paramètres optimaux dans le calcul des gradients de gravité et de gravité dus aux variations de topographie. La topographie joue un rôle majeur dans l'attraction gravitationnelle de la Terre; par conséquent, l'estimation des effets topographiques doit être soigneusement prise en compte dans le traitement des données gravimétriques, en particulier dans les zones de topographie accidentée ou à grande échelle. Pour les études de gravité de haute précision à l'échelle mondiale, le processus de correction de la topographie doit prendre en compte l'effet topographique de la Terre entière. Mais pour les applications locales à régionales basées sur des variations relatives à l'intérieur de la zone, nous montrons que la topographie tronquée à une distance spécifique peut être adéquate, même si ignorer la topographie de cette distance peut générer des erreurs. Pour soutenir ces arguments, nous montrons les relations entre les erreurs relatives à la gravité, la distance de troncature de la topographie et l'étendue de la zone d'étude. Enfin, nous abordons le problème: les mesures GOCE sont-elles pertinentes pour obtenir une image détaillée de la structure d'une plaque de subduction, y compris sa géométrie et ses variations latérales? Les résultats du calcul des avec des modèles de subduction synthétiques calculés à l’altitude moyenne du GOCE (255 km) démontrent que les bords de subduction et les variations latérales du pendage produisent des variations des gradients détectables avec le jeu de données GOCE. Dans l'application à la zone de subduction Izu-Bonin-Mariana (IBM), la topographie et les effets bathymétriques ont été supprimés avec succès. Cependant, dans l'application au cas réel de la zone de subduction Izu-Bonin-Mariana, les caractéristiques géométriques du second ordre du slab sont difficiles à détecter en raison de la présence des effets crustaux restants. Ceci est dû à l'imprécision du modèle crustal global existant qui est utilisée, qui conduit à une élimination impropre de l'effet crustal<br>Nowadays, the scientific community has at its disposal gravity and gravity gradient datasets with unprecedented accuracy and spatial resolution that enhances our knowledge of Earth gravitational field at various scales and wavelengths, obtained from ground to satellite measurements. In parallel with gravimetry, the advancement of satellite observations provides the community with more detailed digital elevation models to reflect the Earth’s structure geometry. Together, these novel datasets provide a great opportunity to better understand the Earth’s structures and dynamics at local, regional, and global scales. The use and interpretation of these high-quality data require refinement of standard approaches in gravity-related data processing and analysis. This thesis consists of a series of studies aiming to improve the precision in the chain of gravity and gravity gradient data processing for geodynamic studies. To that aim, we develop a tool, named GEEC (Gal Eötvös Earth Calculator) to compute precisely the gravity and gravity gradients effects of due to any mass body regardless of its geometry and its distance from measurements. The gravity and gravity gradients effects are computed analytically using the line integral solution of an irregular polyhedron. The validations at local, regional, and global scales confirm the robustness of GEEC’s performance, where the resolution of the model, that depends on both size of the body mass and its distance from the measurement point, control strongly the accuracy of the results. We present an application for assessing the optimum parameters in computing gravity and gravity gradients due to topography variations. Topography has a major contribution in Earth gravitational attraction, therefore the estimation of topography effects must be carefully considered in the processing of gravity data, especially in areas of rugged topography or in large-scale studies. For high-accuracy gravity studies at a global scale, the topography correction process must consider the topography effect of the entire Earth. But for local to regional applications based on relative variations within the zone, we show that truncated topography at a specific distance can be adequate, although, ignoring the topography pas this distance could produce errors. To support these arguments, we show the relationships between gravity relative errors, topography truncation distance, and the extent of study zone. Lastly, we approach the issue: Are GOCE measurements relevant to obtain a detailed image of the structure of a subducting plate, including its geometry and lateral variation? The results of gravity gradient forward modelling using synthetic subduction models computed at GOCE’s mean altitude (255 km) demonstrate that both subduction edges and lateral variations of subduction angle produce gravity gradient variations that are detectable with GOCE dataset (∼100 km wavelength and 10 mE amplitude). However, in the application to the real case of Izu-Bonin-Mariana subduction zone, the second-order geometric features of the subducting plate are difficult to be detected due to the presence of the remaining crustal effects. This is caused by the inaccuracy of the existing global crustal model, that leads to inaccurate crustal effect removal
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Hatam, Chavari Yaghoub. "Etablissement des nouveaux réseaux multi-observations géodésiques et gravimétriques, et détermination du géoïde en Iran." Thesis, Montpellier 2, 2010. http://www.theses.fr/2010MON20089.
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Iran couvre une grande superficie en longitude entre les méridiens 44°E et 64°E et en latitude entre les parallèles 25°N et 40°N. la cartographie de champ de pesanteur sur l'Iran est de première importance pour des considérations d'ordre géodésique, géophysique et géodynamique. Dans cette thèse, les mesures de pesanteur sont utilisées pour déterminer le géoïde gravimétrique sur l'Iran. Ce géoïde est couplé à la mesure de hauteur GPS et d'altitude (nivellement) pour réaliser une surface verticale opérationnelle sur le territoire Iranien. La contribution aux principaux travaux géodésiques et gravimétriques réalisés ces dernières années porte sur l'établissement: 1) du réseau national de gravimétrique absolu de l'Iran (NAGNI09), 2) de la ligne nationale d'étalonnage de gravimétrique de l'Iran (NGCLI10), 3) du réseau multi- observations géodésiques et gravimétriques de l'Iran (MPGGNI10). Le réseau gravimétrique absolu, comporte 24 stations où la mesure de la pesanteur a été réalisée à l'aide de gravimètres FG5, avec une précision meilleure que 5 Gal. La répétition des observations sur deux sites entre 2000 et 2007 met en évidence des variations inter-annuelles de la pesanteur en relation avec l'évolution du contenu en eau du sous-sol et (ou) la déformation tectonique. Le réseau a servi de point d'appui pour la réalisation du réseau géodésique et gravimétrique MPGGNI10 de maille 55 km sur lequel a été mesuré la pesanteur à l'aide des gravimètres relatifs CG5 et CG-3/M, la hauteur de GPS et l'altitude avec une précision respectivement de 0.010 mGal, 0.03 m et . La technique de retrait- restauration couplée à la méthode de condensation de Helmert a permis de calculer un nouveau modèle de géoïde gravimétrique, IRGeoid10, avec une précision absolue et relatif respectivement de l'ordre de 0.26 m et 2.8 ppm. Ce géoïde est ajusté aux points GPS nivelés pour définir un nouveau référentiel des altitudes sur l'Iran<br>Iran covers a large area limited in longitude by the meridians 44°E and 64°E and in latitude by the parallels 25°N and 40°N. Mapping a new gravity field over Iran is the first important data for geodetic, geophysical and geodynamical considerations. In this thesis, the gravity measurements are used to determine the gravimetric geoid over Iran. This geoid is coupled with the GPS height and altitude (levelling) to realize an operational vertical surface at the territory of Iran. The contribution of the principal geodetic and gravimetric works realized in recent years are the establishment of: 1) the national absolute gravity network of Iran (NAGNI09), 2) the national gravity calibration line of Iran (NGCLI10) and 3) the multi-observations geodetic and gravimetric network of Iran (MPGGNI10). The absolute gravity network consists in 24 stations where the gravity measurement has been realized with the help of gravimeters FG5, with a precision better than 5 Gal. The repetition of the observations at two stations between 2000 and 2007 makes obvious the inter-annual variations of gravity in relation of the amount of underground water changes and (or) tectonic deformation. The absolute gravity network has served the base stations for the realization of the MPGGNI10 geodetic and gravimetric network with a mesh of 55 km, at which the gravity is measured with the help of relative gravimeters CG-5 and CG-3/M, the GPS height and the altitude with a precision of 0.010 mGal, 0.03 m, and respectively. The remove-restore technique coupled with the Helmert's condensation method is chousen to compute a new gravimetric geoid model, IRGeoid10, with a absolute and relative precision of the order of 0.26 m and 2.8 ppm respectively. The gravimetric geoid is adjusted at the GPS/levelling points to define new vertical reference surface over Iran
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Poropat, Lea [Verfasser]. "Importance of numerical ocean modelling and in situ ocean bottom pressure observations for satellite gravimetry from GRACE and GRACE-FO / Lea Poropat." Berlin : Freie Universität Berlin, 2020. http://d-nb.info/1215571895/34.
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Hauth, Matthias. "A mobile, high-precision atom-interferometer and its application to gravity observations." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät, 2015. http://dx.doi.org/10.18452/17353.
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Atom Interferometrie ist eine sehr genaue und sensitive Methode mit einer Vielzahl von Anwendungsmöglichkeiten, zu der auch die Messung der Erdbeschleunigung zählt. Während die meisten Atom Interferometer aus großen, ortsfesten Aufbauten bestehen, werden auf diesem Gebiet häufig mobile Messgeräte benötigt. Das Gravimetric Atom Interferometer (GAIN) Projekt wurde ins Leben gerufen, um dieser zusätzlichen Anforderung bei bestmöglicher Messgenauigkeit gerecht zu werden. Es soll eine Alternative zu anderen modernsten Gravimetertypen geschaffen werden, die wichtige funktionale Eigenschaften wie eine hohe Auflösung und absolute Genauigkeit in einem Gerät vereint. Der GAIN Sensor verwendet lasergekühlte Rb87 Atome in einer 1 m hohen Fontäne. Mit Hilfe von stimulierten Raman Übergängen wird ein beschleunigungssensitives Interferometer realisiert. In dieser Arbeit wurde der Sensor mit Blick auf mobile und driftfreie Langzeitmessungen weiterentwickelt. Dafür wurden einzelne Subsysteme des Laseraufbaus auf die daraus resultierenden Anforderungen hin angepasst oder neu entwickelt. Mit derselben Zielstellung wurden weiterhin systematische Effekte in dem Messaufbau untersucht und Maßnahmen für ihre Reduzierung realisiert. Der Aufbau wurde transportiert und in relevanten Umgebungen getestet. Dabei konnte gezeigt werden, dass die Leistungsfäigkeit dieses Aufbaus mit denen der wichtigsten und modernsten Gravimeter konkurieren kann, sie teilweise übertrifft und dass dieser Sensor zur präzisen Kalibrierung der relativen Gravimeter verwendet werden kann. In den Messungen wurde eine Sensitivität von 138 nm/s^2/Sqrt(Hz) sowie eine Langzeitstabilität von 5 x 10^−11 g über 10^5 s erreicht.<br>Atom interferometry offers a very precise and sensitive measurement tool for various areas of application whereof one is the registration of the gravity acceleration. While the vast majority of atom interferometers include large and stationary setups, this field very often implies the additional request for a mobile apparatus. The Gravimetric Atom Interferometer (GAIN) project has been started to meet this requirement and to provide best possible accuracy at the same time. It aims to realize an alternative to other types of gravimeters and to combine important qualities such as high sensitivity and absolute accuracy in one instrument. The GAIN sensor is based on laser-cooled Rb87 atoms in a 1 m atomic fountain. Stimulated Raman transitions form a Mach-Zehnder type interferometer which is sensitive to accelerations. In this work it has been advanced to meet all requirements for mobile and drift-free long-term operation. Therefore, selected parts of the laser system have been improved or redeveloped. A second focus has been on systematic effects for the same objective. They have been analyzed and measures for their suppression have been undertaken. The apparatus has been transported, tested in relevant environments, and compared to the most important state-of-the-art gravimeter types where a competitive performance has been achieved. It is demonstrated, that the gravity signal of this sensor allows for a precise calibration of the relative gravimeter types. During the measurements a best sensitivity of 138 nm/s^2/Sqrt(Hz) and a stability of 5 x 10^−11 g after 10^5 s has been reached.
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Багрій, С. М. "Геофізичний моніторинг геологічного середовища в межах родовищ калійної солі (на прикладі Калуш - Голинського родовища)". Thesis, Івано-Франківський національний технічний університет нафти і газу, 2016. http://elar.nung.edu.ua/handle/123456789/31.
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Дисертацію присвячено еколо-геологічним проблемам, які виникли в районі відпрацьованих шахтних рудників Калуш-Голинського родовища калійних солей. Робота спрямована на виявлення провально-просадкових процесів в межах шахтних полів та забруднення водоносного горизонту відходами гірничовидобувних підприємств з використанням геофізичних методів. Здійснено моніторинг ділянок шахтних полів Калуш-Голи нсь кого родовища із застосуванням геофізичних методів. Показано, що першочерговим методом досліджень має бути метод ПІЕМПЗ, а також продемонстровано ефективність методу для прогнозу розвитку просідань на стадії експрес-інформації. У роботі використано комплексний підхід до застосування геофізичних методів для детального картування зон осідання земної поверхні, провально-просадкових процесів та зон забруднення водоносного горизонту. Для шахтних полів "Калуш", "Ново-Голинь" побудовані просторові моделі та карти критерію провально-просадкової небезпеки, оконтурено та встановлено зони забруднення водоносного горизонту із визначенням швидкості переміщення в бік р. Лімниця.<br>The thesis is devoted to ecological and geological problems that have arisen in the area of waste mine mines of Kalush-Holyn potassium salt deposit. The aim of the paper is using geophysical methods to detect failure-subsidence processes on mine fields and contamination of the aquifer with the waste materials from mining enterprises. The monitoring of Kalush-Holyn potassium salt deposit mine fields were conducted using geophysical methods. The author shows that NPEMFE method is the most convenient to implement such researches. For the first time the classification characteristics of NPEMFE anomalies were formed and agreed with the causes and characteristics of deformation processes. The author formed the criteria for qualitative interpretation for specific geological situations and demonstrated effectiveness of the method for the prediction of subsidence at the stage of rapid information. Author offers the method of calculating the quantitative characteristics of surface subsidence based on analysis of decompacted rocks recorded by gravimetry in monitoring mode. Options for calculating for both discrete and gradient environments are represented. The results are necessary with regard to their informativity for further substantiation of managerial decisions on further exploitation of research areas. Integrated interpretive model of VES and SFF methods was substantiated in this paper. The author has built general electric section for the separate mine fields of Kalush- Holyn deposit taking into account the development of karst processes. This enabled the correction of geological sections in the specification of the lithological composition of rocks of individual layers that allowed the opportunity to outline the area of distribution of fluid clay and establish the degree of erosion of salt mirror regardless of the filling chambers, namely, to get independent information about subsidence and landslides. The paper presents a comprehensive approach of geophysical methods for detailed mapping of the surface subsidence zones, failure-subsidence processes and contaminated zones of the aquifer. Spatial models and criterion failure maps of failure-subsidence danger were built for the mine fields "Kalush” and "Novo Holyn", contaminated zones of the aquifer were delineated and defined with the determination of velocity toward the river Limnytsya.
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Lin, Chang-Ching, and 林長青. "A Study of Combining Adjustment of Leveling and Gravimetric Observations with Different Weighting Models." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/53429387825010007204.
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碩士<br>國立中興大學<br>土木工程學系<br>88<br>The observations of both gravity and leveling have the most important information of gravity field and geometry of point vertical part. This study builds the co-adjustment models of two kind observations with different weighting models. The Taiwan first order leveling network will be used as the test network. The different determination will be discussed between co-adjustment and traditional model.
This research is aimed to propose five adjustment ways in the study, which are （1）The leveling adjustment of using only one mean sea level reference point(fixed I0007 in middle area), （2）The leveling adjustment of using only one mean sea level reference point(fixed A585 in northern area), （3）The combining adjustment of leveling and gravimetric network of using only one mean sea level reference point(fixed A585 in northern area),（4）The combining adjustment of leveling and gravimetric free network, （5）The leveling adjustment of free network. This five adjustment ways with different weighting models to analysis the accuracy. This research is aimed to propose four weighting models in the study, which are using the section length, the numbers of station, the weighting of gravity potential and the standard deviation which also computed from section discrepancies within each individual line that the systematic effects were considered.
It has been shown by this research, the largest standard deviation within all bench-marks obtained by using these four weighting models (P1,P2,P3and P4)are 2.942cm, 2.939cm, 2.979cm and 2.987cm respectively. To give a more clear idea in location, the largest standard deviation of this bench-mark obtained from these weighting models occurred on Kenting with the exception of P4, it’s occurred on Nan-Hen.
It has been shown by this research resolution, the accuracy of combining leveling and gravimetric observations adjustment are better than methods that only changes the weighting of observation in network.
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Yang, Wan-Hsin, and 楊婉歆. "Water budget variation of the South China Sea in relation to ENSO as determined from space altimetric and gravimetric observations." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/47942532895239053672.
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碩士<br>國立中央大學<br>地球科學學系<br>104<br>The South China Sea (SCS) is a semi-enclosed marginal sea surrounded by continents and islands, thus, water can only exchange through the straits. In this study, we analyze the water budget variations of SCS during 1993-2014, using (i) the AVISO-released surface geostrophic current (SGC) daily data computed by combining the satellite altimeter data in reference to the Gravity Field and Steady-State Ocean Circulation Explorer (GOCE) geoid; (ii) the Gravity Recovery and Climate Experiment (GRACE) monthly time-variable gravity signifying the water mass variation; and (iii) daily sea level variation (SLV) from AVISO satellite altimeter data. We find from (i) that SGC water intrusion into SCS through the Luzon Strait, normally stronger in winter and weaker in summer, is correlated at the coefficient of 0.28 with the Multivariate El Niño Southern Oscillation (ENSO) Index (MEI) apparently under the influence of the variation of monsoon and the strength of Kuroshio in response to the ENSO. As the water mass budget will also be reflected in the gravity and SLV, we use the GRACE data (ii) to find the water mass redistributions and the satellite altimeter data (iii) for the SLV in SCS, both showing similar annual variation patterns. We also conduct the Empirical Orthogonal Function (EOF) analysis on the non-seasonal datasets. We find both leading modes showing unison water rise-and-fall behavior in the whole SCS. Their time series have correlation coefficients up to 0.44 and 0.30, respectively, with the MI. This means SCS water budget is under ENSO influence, not only in the intrusion but also reflected in the mass and sea level height. The SCS water budget variation is larger in normal winters and smaller during El Niño years.
Book chapters on the topic "Gravimetric observations"
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Reguzzoni, M., and D. Sampietro. "An Inverse Gravimetric Problem with GOCE Data." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_60.
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Czuczor, Ernö, and Carl Gerstenecker. "“Feldgrav” A Data Bank System for High Precision Gravity Observations." In Gravity, Gradiometry and Gravimetry. Springer New York, 1990. http://dx.doi.org/10.1007/978-1-4612-3404-3_15.
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Vajda, P., A. Ellmann, B. Meurers, P. Vaníček, P. Novák, and R. Tenzer. "Harmonic Continuation and Gravimetric Inversion of Gravity in Areas of Negative Geodetic Heights." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_4.
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Tenzer, R., I. Prutkin, R. Klees, T. Rus, and N. Avramiuc. "On Modelling the Regional Distortions of the European Gravimetric Geoid EGG97 in Romania." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_46.
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Daras, I., H. Fan, K. Papazissi, and J. D. Fairhead. "Determination of a Gravimetric Geoid Model of Greece Using the Method of KTH." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_54.
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Cesare, Stefano, Sergio Mottini, Fabio Musso, et al. "Satellite Formation for a Next Generation Gravimetry Mission." In Small Satellite Missions for Earth Observation. Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03501-2_11.
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Alberts, B. A., B. C. Gunter, A. Muis, et al. "Correcting Strapdown GPS/INS Gravimetry Estimates with GPS Attitude Data." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_13.
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Gerlach, Ch, R. Dorobantu, Ch Ackermann, N. S. Kjørsvik, and G. Boedecker. "Preliminary Results of a GPS/INS Airborne Gravimetry Experiment Over the German Alps." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_1.
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Amalvict, M. "Absolute Gravimetry at BIPM, Sèvres (France), at the Time of Dr. Akihiko Sakuma." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_12.
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Appleby, G., V. Smith, M. Wilkinson, M. Ziebart, and S. Williams. "Comparison of Height Anomalies Determined from SLR, Absolute Gravimetry and GPS with High Frequency Borehole Data at Herstmonceux." In Gravity, Geoid and Earth Observation. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-10634-7_15.
Full textConference papers on the topic "Gravimetric observations"
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Fallet, Christine. "CARIOQA: A Pathfinder Mission for Quantum Space Gravimetry." In IAF Earth Observation Symposium, Held at the 75th International Astronautical Congress (IAC 2024). International Astronautical Federation (IAF), 2024. https://doi.org/10.52202/078362-0062.
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Rocchini, Gabriele, and Giorgio Perboni. "Electrochemical Characterization of Some Commercial Inhibitors Used for the Acid Cleaning of Steam Generators." In CORROSION 1986. NACE International, 1986. https://doi.org/10.5006/c1986-86352.
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Abstract The behaviour of four commercial inhibitors used for the pickling baths and acid cleaning of steam generators in thermal power stations has been investigated and their inhibitor effectiveness has been determined both with gravimetrical tests and with electrochemical measurements. The latter have shown that a complete surface impedance diagram on Argand's plane is very helpful in discriminating the behaviour of a given corrosion inhibitor, quantitatively as well as qualitatively. In addition, numerical elaboration of the polarization curves has revealed that corrosion current density gives a satisfactory reproduction of the real behaviour of the metal sample only for one commercial inhibitor. Use of the polarization resistance, however, has proved to be a valuable means of evaluating the inhibiting power. Within the concentration interval of practical interest, polarization resistance has yielded the same results as the gravimetric tests. A very interesting observation is that all four products exhibit a constant efficiency over a fairly wide concentration interval. This is of considerable importance because it is our opinion that the concentration of the inhibitor is never homogeneous during acid cleaning.
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Wang, C., A. Neville, S. Ramachandran, and V. Jovancicevic. "Understanding the Action of Inhibitors in Mitigating Erosion-Corrosion in Impinging Flows." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04658.
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Abstract Erosion-corrosion is a complex mechanism of material degradation resulting from interactions between electrochemical and mechanical processes. The consequences of erosion-corrosion are severe with economic penalties resulting from premature failure of components, increased downtime and increased maintenance costs. This paper assesses the efficiency of two commercial corrosion inhibitors in reducing material damage occurring as a consequence of erosion - corrosion processes. An assessment of the damage is made using gravimetric techniques, electrochemical measurements and visual observation. This paper identifies the role that inhibitors can play in reducing damage, in addition to that caused by corrosion processes alone. The performance of inhibitors in these extremely aggressive erosion-corrosion conditions is discussed in relation to their ability to maintain carbon steel degradation at an acceptable level.
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Bychkov, S. G., A. A. Simanov, and V. V. Khokhlova. "Control of The Process of Subsidence of The Earth's Surface by Monitoring Gravimetric Observations." In Engineering and Mining Geophysics 2021. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202152028.
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Katterbauer, Klemens, Abdallah Al Shehri, and Abdulaziz Al Qasim. "A Quantum Gravity AI Framework for CO2 Storage Monitoring and Optimization." In ADIPEC. SPE, 2022. http://dx.doi.org/10.2118/210841-ms.
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Abstract Gravimetry is a physical method with a large depth of investigation. Traditional applications include surface gravity observations for mining and oil exploration and borehole gravity logging for investigating formation bulk density. Quantum gravity sensors have recently been developed allowing to achieve considerably higher accuracy and signal to noise ratios as compared to conventional gravimetric approaches. Borehole gravity data have some advantages over the surface data, because the sensors are closer to the reservoir better spatial resolution is obtained; and because the deep borehole gravity data are less affected than surface data by near surface changes. We have developed a new AI driven framework for the interpretation and monitoring of CO2 migration for CO2 storage applications. The framework utilize an integrated LSTM -Bayesian inference framework approach that to determine the gravity gradient within the reservoir and infer from this the possible movement in the reservoir. The LSTM framework evaluates the time lapse gravity gradient changes to infer from it the migration of the CO2 movement. We evaluated the framework on a public benchmark dataset of the Pohokura field in New Zealand. The Pohokura field in New Zealand has been investigated as a reservoir for CO2 storage given its acceptable reservoir quality and seal rock structure. The framework was evaluated on simulated CO2 storage migration patterns with multiple scenarios, taking into account the uncertainties that may arise with respect to various potential CO2 migration scenarios. The study outlines the enhanced accuracy and tracking of CO2 front movement within the reservoir based on quantum gravity sensors integrated with an AI framework. The deep learning framework represents an important step at utilizing quantum borehole gravity sensing for CO2 movement monitoring and the optimization of CO2 storage. The AI framework outlined the considerable potential of quantum gravity sensing for CO2 storage monitoring and optimization.
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Kuznetsov, Andrey, Andrey Kuznetsov, Yury Fedorov, et al. "SELF-CLEANING CAPACITY OF SEACOASTS IN CASE OF OIL POLLUTION." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.31519/conferencearticle_5b1b9441ab8c21.53053195.
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The sea coasts are especially exposed to the oil pollution harmful influence as they frequently suffer from oil spills relating to the tanker accidents, port and off-shore activities. The objective of the present research is to examine the rates of spilled fuel oil natural destruction on geographically different seacoasts and to evaluate their relationship with principal environmental factors such as climatic and hydrological conditions, coast exposure and geomorphology, sediment types, intensity of biogeochemical cycles. For this purpose, a number of contaminated sectors of the Atlantic coasts of France and Spain (areas of “Erika” and “Prestige” tanker accidents), the Strait of Kerch (“Volgoneft-139” tanker accident) and the Black Sea coast in Russia (area of Novorossiysk sea port) were studied. Long-term (from 6 to 15 years) field observations were carried out there. The oiled samples were analyzed with the use of thin layer and column chromatography, optical and gravimetric methods. The results show that in the course of time, the oil slicks demonstrate an exponential diminution in their size, number and in the ratio of labile hydrocarbons content to conservative asphaltic components content. The half-period of this diminution varies from less than 1 to 12 years, subject to the forms of fuel oil traces and geographical conditions. On the Strait of Kerch coast washed by shallow, slightly salted and highly bio-productive waters of the Sea of Azov the spilled fuel oil tends to disappear twice as rapidly as on French and Spanish coasts of the Atlantic Ocean. The joint examination of the observed rates of oil pollution natural destruction and the geographical conditions of studied sites shows that temperature and seawater salinity are the crucial environmental factors of self-cleaning process.
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Kuznetsov, Andrey, Andrey Kuznetsov, Yury Fedorov, et al. "SELF-CLEANING CAPACITY OF SEACOASTS IN CASE OF OIL POLLUTION." In Managing risks to coastal regions and communities in a changing world. Academus Publishing, 2017. http://dx.doi.org/10.21610/conferencearticle_58b43166a1b2f.
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The sea coasts are especially exposed to the oil pollution harmful influence as they frequently suffer from oil spills relating to the tanker accidents, port and off-shore activities. The objective of the present research is to examine the rates of spilled fuel oil natural destruction on geographically different seacoasts and to evaluate their relationship with principal environmental factors such as climatic and hydrological conditions, coast exposure and geomorphology, sediment types, intensity of biogeochemical cycles. For this purpose, a number of contaminated sectors of the Atlantic coasts of France and Spain (areas of “Erika” and “Prestige” tanker accidents), the Strait of Kerch (“Volgoneft-139” tanker accident) and the Black Sea coast in Russia (area of Novorossiysk sea port) were studied. Long-term (from 6 to 15 years) field observations were carried out there. The oiled samples were analyzed with the use of thin layer and column chromatography, optical and gravimetric methods. The results show that in the course of time, the oil slicks demonstrate an exponential diminution in their size, number and in the ratio of labile hydrocarbons content to conservative asphaltic components content. The half-period of this diminution varies from less than 1 to 12 years, subject to the forms of fuel oil traces and geographical conditions. On the Strait of Kerch coast washed by shallow, slightly salted and highly bio-productive waters of the Sea of Azov the spilled fuel oil tends to disappear twice as rapidly as on French and Spanish coasts of the Atlantic Ocean. The joint examination of the observed rates of oil pollution natural destruction and the geographical conditions of studied sites shows that temperature and seawater salinity are the crucial environmental factors of self-cleaning process.
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Knight, Tristan, Axel Rousse, Clémence Allietta, and Benjamin Bérat. "TOLOSAT project: Gravimetry and communication." In Symposium on Space Educational Activities (SSAE). Universitat Politècnica de Catalunya, 2022. http://dx.doi.org/10.5821/conference-9788419184405.009.
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The use of Constellations for weather science, security and disaster monitoring is a major challenge for space application services. Satellite to satellite communication using existing constellations has not been extensively explored yet. It can improve the communication times for small-satellite missions which have limited access to ground stations. Thus, a mission to demonstrate the feasibility of this link is required. Another element of interest in space application is Earth Observation, especially in the context of Climate Change. Gravimetry allows an understanding of mass transport in the Earth System through the remote sensing of the time variation of the Earth gravity field. CubeSats are low-cost small-scale and hence lower risk solutions to Earth Observation missions. University CubeSats have shown their success in demonstration and scientific missions, and have a great potential in providing students with practice and application on real space systems. In this context, the student associations ASTRE and SUPAERO CubeSat Club have joined in a CubeSat program called TOLOSAT, with the hope of demonstrating such technologies. Gathering 70 students from Toulouse, the team was split into subsystems in accordance with the concurrent engineering principles. The work performed followed recommendations from experts from the French National Centre for Space Studies (CNES) and the industry. The TOLOSAT payloads have to test and demonstrate new means of measuring gravity and addressing communication issues. Firstly, for the gravimetry mission, our approach relies solely on GNSS to compute the gravity field, avoiding expensive gravimeters. For the communication mission: the Iridium constellation will be used as an intermediate between the CubeSat and the ground station. Off-the-shelf components such as patch antennas are planned to prove their efficiency in orbit. This would improve the coverage and the communication window. The preliminary design was completed. TOLOSAT was designed as a 3-unit nanosatellite, on a 97.4° inclined, 500km high orbit. Margins were also ensured to allow a third payload to be defined in the future, that will be used for finance and partnerships. Detailed designs are still required, but the educational purposes have been fulfilled, in terms of discovery of the development of space missions as well as in the teamwork culture. The team is now moving on to a new phase, dedicated to a more detailed conception with an on-going focus on the introduction to students to technical - but not only - fields of knowledge applied to space systems
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Hummel, N., K. Hindriks, K. Bisdom, A. Cilona, I. Al-Kafaji, and B. Kiani. "Unlocking New Insights into Reservoir Deformation Through Bayesian Inversion of Surveillance Data." In SPE Europe Energy Conference and Exhibition. SPE, 2025. https://doi.org/10.2118/225549-ms.
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Abstract We developed an interactive dashboard around an efficient inversion workflow to estimate spatial and temporal reservoir deformation from various geodetic displacement measurements. Our web-based application integrates surface deformation data from sources such as acoustic ranging, InSAR, GPS, gravimetry, optical leveling, and pressure monitoring transducers. The inversion algorithm produces history-matched reservoir deformation models using the Bayesian Maximum A Posterior approach. This tool enables global asset utilization, guiding engineers through a streamlined process to generate subsurface deformation maps routinely. The workflow includes interactive quality control, assurance, and diagnostics for performance evaluation. Compatible with heterogeneous Finite Element geomechanical models, our algorithm significantly accelerates the calibration of 3D models to geodetic observations compared to classical deterministic forward models. Applied to the Ormen Lange field and its geodetic displacement observations, the workflow successfully history-matches seafloor displacement measurements, indicating potential non-elastic slip deformation in the side- and/or overburden.
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Meyssignac, Benoit, Maria Hakuba, Tim Boyer, and Jérôme Benveniste. "First Earth Energy Imbalance Assessment WCRP-ESA Workshop Summary and Recommendations Executive Brief." In First Earth Energy Imbalance Assessment WCRP-ESA Workshop. ESA, 2023. http://dx.doi.org/10.5270/wcrp-esa-eeia-2023.final_report_brief.
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The first edition of the Earth Energy Imbalance Assessment Workshop series was organized by the European Space Agency (ESA) with the support from CNES and 4 others institutions, and took place on 15 to 17 May 2023 at ESA-ESRIN in Frascati (Italy). The workshop brought together 61 scientists from 14 countries. The workshop engaged a wide community with expertise in radiometric remote sensing, satellite altimetry, space gravimetry, ocean in situ measurements and ocean reanalysis to assess and intercompare estimates of Earth's energy imbalance and their time variability and uncertainties. This document is the Executive brief reporting the Summary and Recommendations of the Workshop. Published by: Jérôme Benveniste, European Space Agency (ESA-ESRIN), Directorate of Earth Observation Programmes, Largo Galileo Galilei, 1, Frascati (Roma), I-00044, Italy, email: altimetry.info@esa.int Cite as: Benoit Meyssignac, Maria Hakuba, Seiji Kato, Tim Boyer and Jérôme Benveniste (2023) First Earth Energy Imbalance Assessment WCRP-ESA Workshop Summary and Recommendations Executive Brief, ESA Publication, http://doi.org/10.5270/wcrp-esa-eeia-2023.final_report_brief