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Articles de revues sur le sujet « Evolution of seismicity »

Auteur : Grafiati

Publié le 19 juillet 2023

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1

Ma, Xu, Erik Westman, Dave Counter, Farid Malek, and Brent Slaker. "Passive Seismic Imaging of Stress Evolution with Mining-Induced Seismicity at Hard-Rock Deep Mines." Rock Mechanics and Rock Engineering 53, no. 6 (2020): 2789–804. http://dx.doi.org/10.1007/s00603-020-02076-5.

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AbstractThis work aims to examine the stress redistribution with evolving seismicity rates using a passive seismic tomographic tool. We compiled a total of 26,000 events from two underground mines and partitioned them into multiple clusters in a temporal sequence, each of which contains 1000 events. To image stress redistribution associated with seismicity rates, we then run the tomographic studies using each cluster to yield seismic tomograms and computed the corresponding seismicity rate. We found that high velocity anomalies grew with the increase of seismicity rates, and they switched to a

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Aochi, Hideo, Julie Maury, and Thomas Le Guenan. "How Do Statistical Parameters of Induced Seismicity Correlate with Fluid Injection? Case of Oklahoma." Seismological Research Letters 92, no. 4 (2021): 2573–90. http://dx.doi.org/10.1785/0220200386.

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Abstract The seismicity evolution in Oklahoma between 2010 and 2018 is analyzed systematically using an epidemic-type aftershock sequence model. To retrieve the nonstationary seismicity component, we systematically use a moving window of 200 events, each within a radius of 20 km at grid points spaced every 0.2°. Fifty-three areas in total are selected for our analysis. The evolution of the background seismicity rate μ is successfully retrieved toward its peak at the end of 2014 and during 2015, whereas the triggering parameter K is stable, slightly decreasing when the seismicity is activated.

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Badawy, A., S. M. Abdel-Monem, K. Sakr, and Sh M. Ali. "Seismicity and kinematic evolution of middle Egypt." Journal of Geodynamics 42, no. 1-3 (2006): 28–37. http://dx.doi.org/10.1016/j.jog.2006.04.003.

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Nasir, Asma, Esther Hintersberger, and Kurt Decker. "The temporal evolution of seismicity and variability of b-values along the Vienna Basin Transfer Fault System." Austrian Journal of Earth Sciences 116, no. 1 (2023): 1–15. http://dx.doi.org/10.17738/ajes.2023.0001.

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Abstract The Vienna Basin Transfer Fault System (VBTFS) is the most active fault system in the region between the Eastern Alps, the western Carpathians and the Pannonian Basin. The spatial and temporal distribution of earthquakes along the fault system shows a heterogeneous pattern including a long-time decay of seismicity at the northern part of the VBTFS, which was interpreted to result from a long aftershock sequence subsequent to the 1906 Dobrá Voda earthquake (M=5.7). In this paper we investigate if other segments of the VBTFS display similar long-term declines of seismicity that might in

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Vallianatos, Filippos, Georgios Michas, and George Hloupis. "Seismicity Patterns Prior to the Thessaly (Mw6.3) Strong Earthquake on 3 March 2021 in Terms of Multiresolution Wavelets and Natural Time Analysis." Geosciences 11, no. 9 (2021): 379. http://dx.doi.org/10.3390/geosciences11090379.

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On 3 March 2021, a strong, shallow earthquake of moment magnitude, Mw6.3, occurred in northern Thessaly (Central Greece). To investigate possible complex correlations in the evolution of seismicity in the broader area of Central Greece before the Mw6.3 event, we apply the methods of multiresolution wavelet analysis (MRWA) and natural time (NT) analysis. The description of seismicity evolution by critical parameters defined by NT analysis, integrated with the results of MRWA as the initiation point for the NT analysis, forms a new framework that may possibly lead to new universal principles tha

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Mignan, A. "Static behaviour of induced seismicity." Nonlinear Processes in Geophysics Discussions 2, no. 6 (2015): 1659–74. http://dx.doi.org/10.5194/npgd-2-1659-2015.

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Abstract. The standard paradigm to describe seismicity induced by fluid injection is to apply nonlinear diffusion dynamics in a poroelastic medium. I show that the spatiotemporal behaviour and rate evolution of induced seismicity can, instead, be expressed by geometric operations on a static stress field produced by volume change at depth. I obtain laws similar in form to the ones derived from poroelasticity while requiring a lower description length. Although fluid flow is known to occur in the ground, it is not pertinent to the behaviour of induced seismicity. The proposed model is equivalen

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Denlinger, Roger P., and Daniel R. H. O’Connell. "Evolution of Faulting Induced by Deep Fluid Injection, Paradox Valley, Colorado." Bulletin of the Seismological Society of America 110, no. 5 (2020): 2308–27. http://dx.doi.org/10.1785/0120190328.

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ABSTRACT High-pressure fluid injection into a subhorizontal confined aquifer at 4.3–4.6 km depth induced &gt;7000 earthquakes between 1991 and 2012 within once seismically quiescent Paradox Valley in Colorado, with magnitudes up to Mw 3.9. Earthquake hypocenters expanded laterally away from the well with time, defining the margins of the aquifer pressurized by injection at the well. Within 5 km of the well, alignment of earthquake hypocenters defines strikes of nine vertical fault zones. Previous studies show that these fault zones predate injection, producing left-stepping offsets in the

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Lipovsky, Bradley Paul, Colin R. Meyer, Lucas K. Zoet, et al. "Glacier sliding, seismicity and sediment entrainment." Annals of Glaciology 60, no. 79 (2019): 182–92. http://dx.doi.org/10.1017/aog.2019.24.

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ABSTRACTThe evolution of glaciers and ice sheets depends on processes in the subglacial environment. Shear seismicity along the ice–bed interface provides a window into these processes. Such seismicity requires a rapid loss of strength that is typically ascribed to rate-weakening friction, i.e., decreasing friction with sliding or sliding rate. Many friction experiments have investigated glacial materials at the temperate conditions typical of fast flowing glacier beds. To our knowledge, however, these studies have all found rate-strengthening friction. Here, we investigate the possibility tha

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Fan, Gang, Jun Wang, Shunchao Qi, Gongda Lu, Xingguo Yang, and Jiawen Zhou. "Spatiotemporal Evolution of Earthquakes in Longmenshan Fault and Adjacent Area, before and after the 2008 Wenchuan Earthquake." Shock and Vibration 2021 (November 24, 2021): 1–13. http://dx.doi.org/10.1155/2021/9400276.

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Seismicity sequence following a main earthquake usually contains much meaningful information for unveiling the focal mechanism and predicting the reoccurrence interval of large earthquakes. The spatiotemporal evolution of earthquakes before and after the 2008 Wenchuan earthquake (Ms 8.0) is analysed comprehensively in this study. The frequency-magnitude relation of the 3493 earthquake events retrieved from the database of the International Seismological Centre indicates that the adopted catalogue is complete for magnitudes ≥Ms 3.4. The seismicity during the 10 years before the Wenchuan earthqu

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Jia, Ke, Shiyong Zhou, Jiancang Zhuang, et al. "Nonstationary Background Seismicity Rate and Evolution of Stress Changes in the Changning Salt Mining and Shale-Gas Hydraulic Fracturing Region, Sichuan Basin, China." Seismological Research Letters 91, no. 4 (2020): 2170–81. http://dx.doi.org/10.1785/0220200092.

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Abstract The Ms 6.0 earthquake in Changning, Sichuan, China, on 17 June 2019 was the largest recorded earthquake in the stable Sichuan basin. It occurred in a complicated region with salt mining and shale gas production. Whether this earthquake is induced raises concerns among the public and the scientific community. Furthermore, the relation between this earthquake and nearby industrial activities has also been of great interest. To address these questions, we estimated the nonstationary background seismicity rate and inverted for spatiotemporal stress changes. The results show that the backg

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Benson, Philip M., Sergio Vinciguerra, Philip G. Meredith, and R. Paul Young. "Spatio-temporal evolution of volcano seismicity: A laboratory study." Earth and Planetary Science Letters 297, no. 1-2 (2010): 315–23. http://dx.doi.org/10.1016/j.epsl.2010.06.033.

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Durand, Virginie, Stephan Bentz, Grzegorz Kwiatek, et al. "A Two-Scale Preparation Phase Preceded an Mw 5.8 Earthquake in the Sea of Marmara Offshore Istanbul, Turkey." Seismological Research Letters 91, no. 6 (2020): 3139–47. http://dx.doi.org/10.1785/0220200110.

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Abstract We analyze the spatiotemporal evolution of seismicity during a sequence of moderate (an Mw 4.7 foreshock and Mw 5.8 mainshock) earthquakes occurring in September 2019 at the transition between a creeping and a locked segment of the North Anatolian fault in the central Sea of Marmara, northwest Turkey. To investigate in detail the seismicity evolution, we apply a matched-filter technique to continuous waveforms, thus reducing the magnitude threshold for detection. Sequences of foreshocks preceding the two largest events are clearly seen, exhibiting two different behaviors: a long-term

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Chiodini, G., C. Cardellini, F. Di Luccio, et al. "Correlation between tectonic CO2 Earth degassing and seismicity is revealed by a 10-year record in the Apennines, Italy." Science Advances 6, no. 35 (2020): eabc2938. http://dx.doi.org/10.1126/sciadv.abc2938.

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Deep CO2 emissions characterize many nonvolcanic, seismically active regions worldwide, and the involvement of deep CO2 in the earthquake cycle is now generally recognized. However, no long-time records of such emissions have been published, and the temporal relations between earthquake occurrence and tectonic CO2 release remain enigmatic. Here, we report a 10-year record (2009–2018) of tectonic CO2 flux in the Apennines (Italy) during intense seismicity. The gas emission correlates with the evolution of the seismic sequences: Peaks in the deep CO2 flux are observed in periods of high seismici

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Goltz, C. "Decomposing spatio-temporal seismicity patterns." Natural Hazards and Earth System Sciences 1, no. 1/2 (2001): 83–92. http://dx.doi.org/10.5194/nhess-1-83-2001.

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Abstract. Seismicity is a distributed process of great spatial and temporal variability and complexity. Efforts to characterise and describe the evolution of seismicity patterns have a long history. Today, the detection of changes in the spatial distribution of seismicity is still regarded as one of the most important approaches in monitoring and understanding seismicity. The problem of how to best describe these spatio-temporal changes remains, also in view of the detection of possible precursors for large earthquakes. In particular, it is difficult to separate the superimposed effects of dif

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Sakkas, Vassilis, Vasilis Kapetanidis, George Kaviris, et al. "Seismological and Ground Deformation Study of the Ionian Islands (W. Greece) during 2014–2018, a Period of Intense Seismic Activity." Applied Sciences 12, no. 5 (2022): 2331. http://dx.doi.org/10.3390/app12052331.

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Seismicity in the Ionian Sea (W. Greece) is mainly generated along the Cephalonia–Lefkada Transform Fault Zone (CLTFZ) in the central Ionian, and on the northwestern termination of the Hellenic subduction margin in the south. Joint pre-, co- and post-seismic ground deformation and seismological analysis is performed at the broad Ionian area, aiming to homogeneously study the spatiotemporal evolution of the activity prior to and after the occurrence of strong (M > 6) earthquakes during the period of 2014–2018. The 2014 Cephalonia earthquakes (Mw6.1 and Mw5.9) were generated on a faulting sys

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Huang, Qinghua. "Seismicity Pattern Changes Prior to the 2008 Ms7.3 Yutian Earthquake." Entropy 21, no. 2 (2019): 118. http://dx.doi.org/10.3390/e21020118.

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Seismicity pattern changes that are associated with strong earthquakes are an interesting topic with potential applications for natural hazard mitigation. As a retrospective case study of the Ms7.3 Yutian earthquake, which was an inland normal faulting event that occurred on 21 March 2008, the Region-Time-Length (RTL) method is applied to the seismological data of the China Earthquake Administration (CEA) to analyze the features of the seismicity pattern changes before the Yutian earthquake. The temporal variations of the RTL parameters of the earthquake epicenter showed that a quiescence anom

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Kiyashchenko, D., N. Smirnova, V. Troyan, and F. Vallianatos. "Dynamics of multifractal and correlation characteristics of the spatio-temporal distribution of regional seismicity before the strong earthquakes." Natural Hazards and Earth System Sciences 3, no. 3/4 (2003): 285–98. http://dx.doi.org/10.5194/nhess-3-285-2003.

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Abstract. Investigations of the distribution of regional seismicity and the results of numerical simulations of the seismic process show the increase of inhomogenity in spatio-temporal distribution of the seismicity prior to large earthquakes and formation of inhomogeneous clusters in a wide range of scales. Since that, the multifractal approach is appropriate to investigate the details of such dynamics. Here we analyze the dynamics of the seismicity distribution before a number of strong earthquakes occurred in two seismically active regions of the world: Japan and Southern California. In ord

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Bourne, S. J., S. J. Oates, and J. van Elk. "The exponential rise of induced seismicity with increasing stress levels in the Groningen gas field and its implications for controlling seismic risk." Geophysical Journal International 213, no. 3 (2018): 1693–700. http://dx.doi.org/10.1093/gji/ggy084.

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SUMMARY Induced seismicity typically arises from the progressive activation of recently inactive geological faults by anthropogenic activity. Faults are mechanically and geometrically heterogeneous, so their extremes of stress and strength govern the initial evolution of induced seismicity. We derive a statistical model of Coulomb stress failures and associated aftershocks within the tail of the distribution of fault stress and strength variations to show initial induced seismicity rates will increase as an exponential function of induced stress. Our model provides operational forecasts consis

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Mignan, Arnaud. "Static behaviour of induced seismicity." Nonlinear Processes in Geophysics 23, no. 2 (2016): 107–13. http://dx.doi.org/10.5194/npg-23-107-2016.

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Abstract. The standard paradigm to describe seismicity induced by fluid injection is to apply non-linear diffusion dynamics in a poroelastic medium. I show that the spatio-temporal behaviour and rate evolution of induced seismicity can, instead, be expressed by geometric operations on a static stress field produced by volume change at depth. I obtain laws similar in form to the ones derived from poroelasticity while requiring a lower description length. Although fluid flow is known to occur in the ground, it is not pertinent to the geometrical description of the spatio-temporal patterns of ind

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Grigoratos, Iason, Ellen Rathje, Paolo Bazzurro, and Alexandros Savvaidis. "Earthquakes Induced by Wastewater Injection, Part II: Statistical Evaluation of Causal Factors and Seismicity Rate Forecasting." Bulletin of the Seismological Society of America 110, no. 5 (2020): 2483–97. http://dx.doi.org/10.1785/0120200079.

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ABSTRACT Wastewater disposal has been reported as the main cause of the recent surge in seismicity rates in several parts of central United States, including Oklahoma. In this article, we employ the semi-empirical model of the companion article (Grigoratos, Rathje, et al., 2020) first to test the statistical significance of this prevailing hypothesis and then to forecast seismicity rates in Oklahoma given future injection scenarios. We also analyze the observed magnitude–frequency distributions, arguing that the reported elevated values of the Gutenberg–Richter b-value are an artifact of the f

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He, Xuan, Syed Bilal Hussain Shah, Bo Wei, and Zheng Liu. "Comparison and Analysis of Network Construction Methods for Seismicity Based on Complex Networks." Complexity 2021 (February 1, 2021): 1–11. http://dx.doi.org/10.1155/2021/6691880.

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The approach of the complex network has well described seismic complex systems. In this paper, this is the first time three classical network construction methods for seismicity are compared. By using the same dataset from the Southern California Seismic Network, three networks are constructed. They all present the scale-free, small-world properties, a strength-degree correlation, and an assortative mixing feature. However, they show some differences in the hierarchical clustering feature. On observing the evolution results, three measures show a similar correlation with seismicity dynamics, b

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Henderson, Jeremy, and Ian Main. "A simple fracture-mechanical model for the evolution of seismicity." Geophysical Research Letters 19, no. 4 (1992): 365–68. http://dx.doi.org/10.1029/92gl00274.

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Nazarov, L. A., L. A. Nazarova, A. F. Yaroslavtsev, N. A. Miroshnichenko, and E. V. Vasil’eva. "Evolution of stress fields and induced seismicity in operating mines." Journal of Mining Science 47, no. 6 (2011): 707–13. http://dx.doi.org/10.1134/s1062739147060013.

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Hummel, Nicolas, and Serge A. Shapiro. "Nonlinear diffusion-based interpretation of induced microseismicity: A Barnett Shale hydraulic fracturing case study." GEOPHYSICS 78, no. 5 (2013): B211—B226. http://dx.doi.org/10.1190/geo2012-0242.1.

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For the successful development and operation of hydrocarbon or geothermal reservoirs, knowledge of the hydraulic transport is of crucial importance. Because fundamental physical processes of borehole fluid injections are still insufficiently understood, gathering information about transport properties of rocks under field conditions is quite difficult. However, a substantial contribution in determining the permeability evolution can be obtained by understanding the distribution of induced seismicity in space and time. We have analyzed spatio-temporal characteristics of seismicity recorded duri

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Tashlykova, Tatiana G., Tamara G. Ryashchenko, Anna A. Dolgaya, and Elena A. Lukyanova. "Induced seismicity: a geo-ecological problem of a technogenic nature." Environmental & Socio-economic Studies 4, no. 3 (2016): 21–25. http://dx.doi.org/10.1515/environ-2016-0014.

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Abstract A debatable problem of the display of induced seismicity and its causes during the construction of reservoirs (Reservoir Induced Seismicity - RIS) is considered on the basis of an analysis of various publications. This paper describes the history of the evolution of ideas about the possibility of the activation of seismic events in the zones of influence of artificial reservoirs and examples of such activation in aseismic areas, which is a medium geological response to technogenic interference (e.g. Shivajisagar reservoir in West India, Mead reservoir in the USA, Danjiangkou Reservoir

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Kumar, Susheel, and Nitin Sharma. "The seismicity of central and north-east Himalayan region." Contributions to Geophysics and Geodesy 49, no. 3 (2019): 265–81. http://dx.doi.org/10.2478/congeo-2019-0014.

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Abstract The Himalayan range extends upto 2400 km arc from Indus river valley in the west to Brahmaputra river valley in the east of India. Due to distinct geological structures of Himalayan seismic belt, seismicity in Himalaya is inhomogeneous. The inhomogeneity in seismicity is responsible for a number of seismic gaps in the Himalayan seismic belt. Thus Iin the present study, we proposed the study of spatial and temporal evolution of seismicity in entire central and north-east Himalayan region by using Gutenberg-Richter relationship. A detailed study on the behavior of natural seismicity in

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Kamer, Yavor, Guy Ouillon, and Didier Sornette. "Fault network reconstruction using agglomerative clustering: applications to southern Californian seismicity." Natural Hazards and Earth System Sciences 20, no. 12 (2020): 3611–25. http://dx.doi.org/10.5194/nhess-20-3611-2020.

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Abstract. In this paper we introduce a method for fault network reconstruction based on the 3D spatial distribution of seismicity. One of the major drawbacks of statistical earthquake models is their inability to account for the highly anisotropic distribution of seismicity. Fault reconstruction has been proposed as a pattern recognition method aiming to extract this structural information from seismicity catalogs. Current methods start from simple large-scale models and gradually increase the complexity trying to explain the small-scale features. In contrast the method introduced here uses a

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Bourne, Stephen J., and Stephen J. Oates. "Development of statistical geomechanical models for forecasting seismicity induced by gas production from the Groningen field." Netherlands Journal of Geosciences 96, no. 5 (2017): s175—s182. http://dx.doi.org/10.1017/njg.2017.35.

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AbstractThis paper reviews the evolution of a sequence of seismological models developed and implemented as part of a workflow for Probabilistic Seismic Hazard and Risk Assessment of the seismicity induced by gas production from the Groningen gas field. These are semi-empirical statistical geomechanical models derived from observations of production-induced seismicity, reservoir compaction and structure of the field itself. Initial versions of the seismological model were based on a characterisation of the seismicity in terms of its moment budget. Subsequent versions of the model were formulat

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Sahay, Pratap N., and Tobias M. Müller. "Diffusion in deformable porous media: Incompressible flow limit and implications for permeability estimation from microseismicity." GEOPHYSICS 85, no. 2 (2020): A13—A17. http://dx.doi.org/10.1190/geo2019-0510.1.

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Injecting fluid in a borehole often has been observed to be causally related with seismicity. The standard explanation assumes that a stress perturbation spreads out and triggers rock failure. It has been suggested that this spreading is governed by Biot’s slow P-wave, which is a diffusion process associated with compressible fluid flow. Because the diffusion constant is proportional to the permeability, the space-time evolution of seismicity is exploited to estimate the permeability. However, the more plausible scenario of incompressible fluid flow is beyond the scope of Biot’s theory. We hav

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Bilal, Ahmad. "Time-seismicity evolution and seismic risk assessment of the Arabian plate." Natural Science 05, no. 09 (2013): 1019–24. http://dx.doi.org/10.4236/ns.2013.59126.

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Sarhosis, Vasilis, Dimitris Dais, Eleni Smyrou, İhsan Engin Bal, and Anastasios Drougkas. "Quantification of damage evolution in masonry walls subjected to induced seismicity." Engineering Structures 243 (September 2021): 112529. http://dx.doi.org/10.1016/j.engstruct.2021.112529.

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Savard, Geneviève, Michael G. Bostock, and Nikolas I. Christensen. "Seismicity, Metamorphism, and Fluid Evolution Across the Northern Cascadia Fore Arc." Geochemistry, Geophysics, Geosystems 19, no. 6 (2018): 1881–97. http://dx.doi.org/10.1029/2017gc007417.

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Do Nascimento, A. F., P. A. Cowie, R. J. Lunn, and R. G. Pearce. "Spatio-temporal evolution of induced seismicity at Açu reservoir, NE Brazil." Geophysical Journal International 158, no. 3 (2004): 1041–52. http://dx.doi.org/10.1111/j.1365-246x.2004.02351.x.

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Chen, Chien-chih, Ling-Yun Chiao, Ya-Ting Lee, Hui-wen Cheng, and Yih-Min Wu. "Long-range connective sandpile models and its implication to seismicity evolution." Tectonophysics 454, no. 1-4 (2008): 104–7. http://dx.doi.org/10.1016/j.tecto.2008.04.004.

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Wortel, M. J. R., and N. J. Vlaar. "Subduction zone seismicity and the thermo-mechanical evolution of downgoing lithosphere." Pure and Applied Geophysics PAGEOPH 128, no. 3-4 (1988): 625–59. http://dx.doi.org/10.1007/bf00874551.

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Pollitz, Fred F., and Camilla Cattania. "Connecting crustal seismicity and earthquake-driven stress evolution in Southern California." Journal of Geophysical Research: Solid Earth 122, no. 8 (2017): 6473–90. http://dx.doi.org/10.1002/2017jb014200.

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Karvounis, Dimitrios, and Stefan Wiemer. "A discrete fracture hybrid model for forecasting diffusion-induced seismicity and power generation in enhanced geothermal systems." Geophysical Journal International 230, no. 1 (2022): 84–113. http://dx.doi.org/10.1093/gji/ggac056.

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SUMMARY We describe a 3-D discrete fracture hybrid model (DFHM) that returns forecasts of both induced seismicity and of power generation in an Enhanced Geothermal System (EGS). Our model considers pore-pressure increase as the mechanism driving induced seismicity, similarly to other hybrid models, but it uses discrete fracture modelling for flow and heat that allows accurate and realistic transient solutions of pore pressure and temperature in fractured reservoirs. Earthquakes and flow are thus considered as closely coupled processes. In the DFHM model, the creation phase of an EGS is describ

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Vilarrasa, Víctor, Jesus Carrera, Sebastià Olivella, Jonny Rutqvist, and Lyesse Laloui. "Induced seismicity in geologic carbon storage." Solid Earth 10, no. 3 (2019): 871–92. http://dx.doi.org/10.5194/se-10-871-2019.

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Abstract. Geologic carbon storage, as well as other geo-energy applications, such as geothermal energy, seasonal natural gas storage and subsurface energy storage imply fluid injection and/or extraction that causes changes in rock stress field and may induce (micro)seismicity. If felt, seismicity has a negative effect on public perception and may jeopardize wellbore stability and damage infrastructure. Thus, induced earthquakes should be minimized to successfully deploy geo-energies. However, numerous processes may trigger induced seismicity, which contribute to making it complex and translate

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Pirli, Myrto, Johannes Schweitzer, Berit Paulsen, Yana V. Konechnaya, and Galina N. Antonovskaya. "Two Decades of Seismicity in Storfjorden, Svalbard Archipelago, from Regional Data." Seismological Research Letters 92, no. 5 (2021): 2695–704. http://dx.doi.org/10.1785/0220200469.

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Abstract About two decades of earthquake parametric data for the area of Storfjorden offer the best medium-term image of seismicity yet for the arctic Svalbard Archipelago. Although seismic activity is dominated by the 2008 Mw 6.1 earthquake and its compound sequence and to a far lesser extent the 2016 Mw 5.1 event near Edgeøya and its aftershocks, as well as episodic earthquake occurrence at Heerland, background levels can be established for the first time, showing that earthquake occurrence in the region shows an episodic but stable character. A certain, minimum level of coverage by the regi

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Carpinteri, A., G. Lacidogna, and G. Niccolini. "Acoustic emission monitoring of medieval towers considered as sensitive earthquake receptors." Natural Hazards and Earth System Sciences 7, no. 2 (2007): 251–61. http://dx.doi.org/10.5194/nhess-7-251-2007.

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Abstract. Many ancient masonry towers are present in Italian territory. In some cases these structures are at risk on account of the intensity of the stresses they are subjected to due to the high level of regional seismicity. In order to preserve this inestimable cultural heritage, a sound safety assessment should take into account the evolution of damage phenomena. In this connection, acoustic emission (AE) monitoring can be highly effective. This study concerns the structural stability of three medieval towers rising in the centre of Alba, a characteristic town in Piedmont (Italy). During t

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Grigoratos, Iason, Paolo Bazzurro, Ellen Rathje, and Alexandros Savvaidis. "Time-dependent seismic hazard and risk due to wastewater injection in Oklahoma." Earthquake Spectra 37, no. 3 (2021): 2084–106. http://dx.doi.org/10.1177/8755293020988020.

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In the past decade, Oklahoma has experienced unprecedented seismicity rates, following an increase in the volumes of wastewater that are being disposed underground. In this article, we perform a probabilistic assessment of the time-dependent seismic hazard in Oklahoma and incorporate these results into an integrated seismic risk model to assess the evolution of the statewide economic losses, including a conservative forecast through 2030. Our risk model employs an injection-driven earthquake rate model, a region-specific ground motion model, a recent Vs30 map, HAZUS exposure data and updated v

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Lee, D. K., Y. K. Jin, Y. Kim, and S. H. Nam. "Seismicity and tectonics around the northern Antarctic Peninsula from King Sejong station data." Antarctic Science 12, no. 2 (2000): 196–204. http://dx.doi.org/10.1017/s0954102000000250.

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Local earthquakes recorded at the King Sejong station (62° 13′31″S, 58° 47′07″W) from 1995–96 have been analysed to study the seismicity and tectonics around the northern Antarctic Peninsula. The nature of shallow-focused normal fault earthquakes along the South Shetland Platform is still unclear. Dominant normal fault earthquakes and minor strike-slip earthquakes in the Eastern Bransfield Basin suggest 1) ongoing extension, and 2) transtensional stress transmitted from the Antarctic–Scotia transform boundaries, the South Scotia Ridge and the Shackleton Fracture Zone. A lack of seismicity in t

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Baskoutas, Ioannis, George Popandopoulos, and Prasanta Chingtham. "Temporal variation of seismic parameters in the western part of the India-Eurasia plate collision zone." Research in Geophysics 1, no. 1 (2011): 3. http://dx.doi.org/10.4081/rg.2011.e3.

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We examined the temporal seismicity variation in the north-west Himalayas and the adjacent regions in relation to strong earthquake occurrences in the period 1970-2010. The aim was to promote seismic hazard assessment and to show the possibilities of strong earthquake forecasting by means of the FastBEE computer tool. The temporal variation of the seismicity is expressed in terms of three basic seismic parameters: the logarithm of the number of earthquakes logN, the seismic energy released in the mode logE2/3 and the b-value of the earthquake magnitude-frequency distribution expressed by the G

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Henderson, Jeremy, Ian G. Main, Robert G. Pearce, and Mario Takeya. "Seismicity in north-eastern Brazil: fractal clustering and the evolution of thebvalue." Geophysical Journal International 116, no. 1 (1994): 217–26. http://dx.doi.org/10.1111/j.1365-246x.1994.tb02138.x.

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Hong, Tae-Kyung, Junhyung Lee, and Soung Eil Houng. "Long-term evolution of intraplate seismicity in stress shadows after a megathrust." Physics of the Earth and Planetary Interiors 245 (August 2015): 59–70. http://dx.doi.org/10.1016/j.pepi.2015.05.009.

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Wang, Wei-Hau, and Sheng-Ming Huang. "Seismicity and stress evolution in heterogeneous faults with various degrees of roughness." Tectonophysics 424, no. 3-4 (2006): 307–18. http://dx.doi.org/10.1016/j.tecto.2006.03.042.

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Astiopoulos, A. C., E. Papadimitriou, V. Karakostas, D. Gospodinov, and G. Drakatos. "SEISMICITY CHANGES DETECTION DURING THE SEISMIC SEQUENCES EVOLUTION AS EVIDENCE OF STRESS CHANGES." Bulletin of the Geological Society of Greece 43, no. 4 (2017): 1994. http://dx.doi.org/10.12681/bgsg.11390.

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The statistical properties of the aftershock occurrence are among the main issues in investigating the earthquake generation process. Seismicity rate changes during a seismic sequence, which are detected by the application of statistical models, are proved to be precursors of strong events occurring during the seismic excitation. Application of these models provides a tool in assessing the imminent seismic hazard, oftentimes by the estimation of the expected occurrence rate and comparison of the predicted rate with the observed one. The aim of this study is to examine the temporal distribution

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Campbell, L. R., G. E. Lloyd, R. J. Phillips, R. C. Walcott, and R. E. Holdsworth. "Stress fields of ancient seismicity recorded in the dynamic geometry of pseudotachylyte in the Outer Hebrides Fault Zone, UK." Journal of the Geological Society 178, no. 1 (2020): jgs2020–101. http://dx.doi.org/10.1144/jgs2020-101.

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Heterogeneous sequences of exhumed fault rocks preserve a record of the long-term evolution of fault strength and deformation behaviour during prolonged tectonic activity. Along the Outer Hebrides Fault Zone (OHFZ) in NW Scotland, numerous pseudotachylytes record palaeoseismic slip events within sequences of mylonites, cataclasites and phyllonites. To date, the kinematics and controls on seismicity within the long active history of the OHFZ have been poorly constrained. Additional uncertainties over the relative location of a meteorite impact and possible pre-OHFZ brittle faulting also complic

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Cassidy, John F., Garry C. Rogers, and J. Ristau. "Seismicity in the vicinity of the SNORCLE corridors of the northern Canadian Cordillera." Canadian Journal of Earth Sciences 42, no. 6 (2005): 1137–48. http://dx.doi.org/10.1139/e04-063.

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The Slave Northern Cordillera Lithospheric Evolution (SNORCLE) corridors of the northern Cordillera sample some of the most, and least, seismically active regions of Canada. The earthquake history of this region is short. Precise determination of earthquake locations and depths is not possible even today. Nonetheless, significant gains in our knowledge of the seismicity of this region have been made in recent years from studies of historic earthquakes, microseismicity studies, and advances in waveform modelling techniques combined with broadband data that allow for determination of focal mec

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Tan, Fengzhou, Honn Kao, Edwin Nissen, and Ryan Visser. "Tracking earthquake sequences in real time: application of Seismicity-Scanning based on Navigated Automatic Phase-picking (S-SNAP) to the 2019 Ridgecrest, California sequence." Geophysical Journal International 223, no. 3 (2020): 1511–24. http://dx.doi.org/10.1093/gji/ggaa387.

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SUMMARY Recent improvements in seismic data processing techniques have enhanced our ability to detail the evolution of major earthquake sequences in space and time. One such advance is new scanning algorithms that allow large volumes of waveform data to be analysed automatically, removing human biases and inefficiencies that inhibit standardized monitoring. The Seismicity-Scanning based on Navigated Automatic Phase-picking (S-SNAP) workflow has previously been shown to be capable of producing high-quality earthquake catalogues for injection-induced seismicity monitoring. In this study, we modi

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