Relevant bibliographies by topics / Velocity model of the crust

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Velocity model of the crust'

Author: Grafiati
Published: 4 June 2021
Last updated: 3 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Velocity model of the crust.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Velocity model of the crust"

1

Kvapil, Jiří, Jaroslava Plomerová, Hana Kampfová Exnerová, Vladislav Babuška, and György Hetényi. "Transversely isotropic lower crust of Variscan central Europe imaged by ambient noise tomography of the Bohemian Massif." Solid Earth 12, no. 5 (May 11, 2021): 1051–74. http://dx.doi.org/10.5194/se-12-1051-2021.

Full text
Abstract:
Abstract. The recent development of ambient noise tomography, in combination with the increasing number of permanent seismic stations and dense networks of temporary stations operated during passive seismic experiments, provides a unique opportunity to build the first high-resolution 3-D shear wave velocity (vS) model of the entire crust of the Bohemian Massif (BM). This paper provides a regional-scale model of velocity distribution in the BM crust. The velocity model with a cell size of 22 km is built using a conventional two-step inversion approach from Rayleigh wave group velocity dispersion curves measured at more than 400 stations. The shear velocities within the upper crust of the BM are ∼0.2 km s−1 higher than those in its surroundings. The highest crustal velocities appear in its southern part, the Moldanubian unit. The Cadomian part of the region has a thinner crust, whereas the crust assembled, or tectonically transformed in the Variscan period, is thicker. The sharp Moho discontinuity preserves traces of its dynamic development expressed in remnants of Variscan subductions imprinted in bands of crustal thickening. A significant feature of the presented model is the velocity-drop interface (VDI) modelled in the lower part of the crust. We explain this feature by the anisotropic fabric of the lower crust, which is characterised as vertical transverse isotropy with the low velocity being the symmetry axis. The VDI is often interrupted around the boundaries of the crustal units, usually above locally increased velocities in the lowermost crust. Due to the north-west–south-east shortening of the crust and the late-Variscan strike-slip movements along the north-east–south-west oriented sutures preserved in the BM lithosphere, the anisotropic fabric of the lower crust was partly or fully erased along the boundaries of original microplates. These weakened zones accompanied by a velocity increase above the Moho (which indicate an emplacement of mantle rocks into the lower crust) can represent channels through which portions of subducted and later molten rocks have percolated upwards providing magma to subsequently form granitoid plutons.
APA, Harvard, Vancouver, ISO, and other styles
2

Sharov, N. V., L. I. Bakunovich, B. Z. Belashev, and M. Y. Nilov. "Velocity structure and density inhomogeneities of the White Sea crust." Arctic: Ecology and Economy, no. 4(40) (December 2020): 43–53. http://dx.doi.org/10.25283/2223-4594-2020-4-43-53.

Full text
Abstract:
The study area is the White Sea basin and adjacent territories. The relevance of the work carried out here is determined by active geodynamics, kimberlite magmatism, and prospects for the hydrocarbon search. The authors set the goal to model the velocity structure of the region’s crust using data from instrumental observations and the Integro software package. A comprehensive interpretation of gravimetric, magnetometric, seismic, petrophysical and geological data has been carried out. With the help of 2D models based on the DSZ profiles and digital maps of geophysical fields, refined density structures of local sections of the earth’s crust have been specified. The developed 3D density model gives a general picture of the deep structure of the region’s crust. Within its framework, the spatial positions of the layers of the velocity reference model are determined and their connections with density inhomogeneities and geophysical anomalies are established.
APA, Harvard, Vancouver, ISO, and other styles
3

Ma, Shutian, and Pascal Audet. "Seismic velocity model of the crust in the northern Canadian Cordillera from Rayleigh wave dispersion data." Canadian Journal of Earth Sciences 54, no. 2 (February 2017): 163–72. http://dx.doi.org/10.1139/cjes-2016-0115.

Full text
Abstract:
Models of the seismic velocity structure of the crust in the seismically active northern Canadian Cordillera remain poorly constrained, despite their importance in the accurate location and characterization of regional earthquakes. On 29 August 2014, a moderate earthquake with magnitude 5.0, which generated high-quality Rayleigh wave data, occurred in the Northwest Territories, Canada, ∼100 km to the east of the Cordilleran Deformation Front. We carefully selected 23 seismic stations that recorded the Rayleigh waves and divided them into 13 groups according to the azimuth angle between the earthquake and the stations; these groups mostly sample the Cordillera. In each group, we measured Rayleigh wave group velocity dispersion, which we inverted for one-dimensional shear-wave velocity models of the crust. We thus obtained 13 models that consistently show low seismic velocities with respect to reference models, with a slow upper and lower crust surrounding a relatively fast mid crustal layer. The average of the 13 models is consistent with receiver function data in the central portion of the Cordillera. Finally, we compared earthquake locations determined by the Geological Survey of Canada using a simple homogenous crust over a mantle half space with those estimated using the new crustal velocity model, and show that estimates can differ by as much as 10 km.
APA, Harvard, Vancouver, ISO, and other styles
4

Grandjean, Gilles, Hua Wu, Donald White, Marianne Mareschal, and Claude Hubert. "Crustal velocity models for the Archean Abitibi greenstone belt from seismic refraction data." Canadian Journal of Earth Sciences 32, no. 2 (February 1, 1995): 149–66. http://dx.doi.org/10.1139/e95-013.

Full text
Abstract:
We present velocity models for two seismic wide–angle-refraction profiles across the Archean Abitibi greenstone belt and the Pontiac Subprovince. The seismic profiles are 210 and 220 km long. Traveltime inversion and amplitude forward modelling were used to obtain two-dimensional velocity structure and interface geometry. The main features of the velocity models include (1) three crustal layers; (2) variable velocities (5.6–6.4 km/s) in the upper crust (~0–12 km), with the higher velocities generally associated with mafic metavolcanics and the lower velocities with metasediments and granitic plutons; (3) a relatively uniform middle crust (~12–30 km) with velocities ranging from 6.4 to 6.6 km/s; (4) a velocity increase of 0.3 km/s across the middle crust–lower crust boundary; (5) a lower crust (~30–40 km) with velocities increasing from 6.9 km/s at the top to 7.3 km/s at the base; (6) an average upper mantle velocity of 8.15 km/s; (7) depth to Moho of about 40 km in the north-central Abitibi belt, decreasing southward to 37 km beneath the Pontiac Subprovince; and (8) observed attenuation of seismic energy propagating through the Casa–Berardi deformation zone, suggesting a complex structure in this fault zone. The velocity model is generally consistent with seismic reflection interpretations that suggest that the shallow supracrustal assemblages form an allochthonous veneer, overlying a mid-crustal imbricate sequence of metaplutonic and metasedimentary rocks. The uniform-velocity structure below 12 km depth indicates that the tectonic zones juxtaposing disparate crustal blocks may have limited depth extent. The 40 km thick crust and 10 km thick high-velocity lower crustal layer exceed the thicknesses observed in other studies of Archean crust.
APA, Harvard, Vancouver, ISO, and other styles
5

Louden, Keith E., and Jianming Fan. "Crustal structures of Grenville, Makkovik, and southern Nain provinces along the Lithoprobe ECSOOT Transect: regional seismic refraction and gravity models and their tectonic implications." Canadian Journal of Earth Sciences 35, no. 5 (May 1, 1998): 583–601. http://dx.doi.org/10.1139/e98-005.

Full text
Abstract:
Crustal structures of the eastern Grenville, Makkovik, and southern Nain provinces are determined using seismic reflection-refraction and gravity data along the Lithoprobe Eastern Canadian Shield Onshore-Offshore Transect (ECSOOT). Within the Grenville Province, the velocity model contains a 5 km thick upper crust and a variable-thickness middle to lower crust. The total crustal thickness varies from 25 to 43 km, with the thickest crust in the south and thinnest crust in the north. A high-velocity, lower crustal wedge is coincident with a strong band of northward-dipping reflectors. The two-dimensional velocity structure is compatible with modelling of a 60 mGal gravity high over the Hawke River terrane. In the Makkovik Province, the thickness of upper crustal velocities increases to 17 km. The velocity decrease in the upper to middle crust from the Grenville Province to the Makkovik Province is similar to that of refraction models across the Grenville Front in Ontario and Quebec. It is possibly related to a decrease in metamorphic grade from south to north and (or) a larger volume of unmetamorphosed plutons in the Makkovik Province. A lower crustal layer is coincident with a region of increased reflectivity in the lower crust. There are no major crustal discontinuities associated with terrane boundaries within the Makkovik Province. The base of the crust is consistent with a change from north- to south-dipping reflectors beneath the Cape Harrison domain. Alternatively, it may consist of a thick zone of complex velocity variations, consistent with a zone of diffusive reflectivity observed to the north of the Allik domain.
APA, Harvard, Vancouver, ISO, and other styles
6

Corchete, V. "Crustal and upper mantle structure beneath the South China Sea and Indonesia." GSA Bulletin 133, no. 1-2 (May 28, 2020): 177–84. http://dx.doi.org/10.1130/b35641.1.

Full text
Abstract:
Abstract A three-dimensional (3-D) S-velocity model for the crust and upper mantle beneath the South China Sea and Indonesia is presented, determined by means of Rayleigh wave analysis, in the depth range from 0 km to 400 km. The crustal and lithospheric mantle structure of this study area was previously investigated using several methods and databases. Due to their low resolution, a 3-D structure for this area has not been previously determined. The determination of such a 3-D S-velocity model is the goal of the present study. The most conspicuous features of the crust and upper mantle structure include the S-velocity difference between the Java Sea and the Banda Sea regions and a transitional boundary between these two regions. This model confirms the principal structural features revealed in previous studies: an oceanic crust structure in the center of the South China Sea, crustal thinning from the northern continental margin of the South China Sea to this oceanic crust, and the existence of a high-velocity layer in the lower crust of the northern continental margin. This study concludes that the north of the South China Sea is a nonvolcanic-type continental margin, solving the open question of whether the continental margin of the northern South China Sea is volcanic or nonvolcanic. A new map of the asthenosphere’s base is also presented.
APA, Harvard, Vancouver, ISO, and other styles
7

Lu, Y., L. Stehly, R. Brossier, and A. Paul. "Imaging Alpine crust using ambient noise wave-equation tomography." Geophysical Journal International 222, no. 1 (March 24, 2020): 69–85. http://dx.doi.org/10.1093/gji/ggaa145.

Full text
Abstract:
SUMMARY We present an improved crustal Vs model and Moho depth map using ambient noise wave-equation tomography. The so-called ‘ambient noise wave-equation tomography’ is a method to invert seismic ambient noise phase dispersion data based on elastic waveform simulation, which accounts for 3-D and finite-frequency effects. We use cross-correlations of up to 4 yr of continuous vertical-component ambient seismic noise recordings from 304 high-quality broad-band stations in the Alpine region. We use model LSP_Eucrust1.0 obtained from traditional ambient noise tomography as initial model, and we iteratively improve the initial model by minimizing frequency-dependent phase traveltime differences between the observed and synthetic waveforms of Rayleigh waves in the period range 10–50 s. We obtain the final model after 15 iterations with ∼65 per cent total misfit reduction compared to the initial model. At crustal depth, the final model significantly enhances the amplitudes and adjusts the shapes of velocity anomalies. At Moho and upper-mantle depth, the final model corrects an obvious systematic velocity shift of the initial model. The resulting isovelocity Moho map confirms a Moho step along the external side of the external crystalline massifs of the northwestern Alps and reveals underplated gabbroic plutons in the lower most crust of the central and eastern Alps. Ambient noise wave-equation tomography turns out to be a useful tool to refine shear wave velocity models obtained by traditional ambient noise tomography based on ray theory.
APA, Harvard, Vancouver, ISO, and other styles
8

Zhao, Shuai, and Wenbin Guo. "Crustal Structure of Eastern North Carolina: Piedmont and Coastal Plain." Bulletin of the Seismological Society of America 109, no. 6 (October 8, 2019): 2288–304. http://dx.doi.org/10.1785/0120180281.

Full text
Abstract:
Abstract We present the results from an onshore seismic refraction and wide‐angle reflection profile, conducted in 2015, across the coastal plain and eastern Piedmont provinces of North Carolina. We use forward modeling to create 1D synthetic seismogram models and then invert first break picks to create 2D P‐ and S‐wave velocity models. The crustal thickness is 38 km beneath the Piedmont and central coastal plain, but it thins to 32 km at the coastline. The average thickness of the upper crust is 11 km with an average P‐wave velocity (VP) of 6.0 km/s and S‐wave velocity (VS) of 3.5 km/s. A prominent seismic low‐velocity zone (LVZ) (VP<6.0 and VS<3.6 km/s) exists between the depths of 6 and 11 km, beneath the western third of the seismic profile. The middle crust varies greatly in thickness, increasing from 3 km in the west (eastern Piedmont) to 13 km in the east (coastal plain), with seismic velocities of 6.5 km/s for VP and 3.8 km/s for VS. The lower crust thins significantly toward the rifted Atlantic margin, decreasing from 24 km thick in the west (Piedmont) to 8 km at the coastline, with velocities of approximately 6.9 km/s for VP and 3.9 km/s for VS. We estimate the composition of the crust by comparing the measured values of VP and Poisson’s ratio with laboratory measurements. The upper and middle crusts are in agreement with a felsic composition, while the lower crustal composition is predominately felsic to intermediate. The LVZ in the upper crust is associated with thin layers of the mylonitic rocks involved in the top and the bottom of thrusting, and the top of the lower crust could be the master detachment fault during the thin‐skinned Alleghanian orogeny. The eastward thinning of the lower crust is consistent with crustal extension during the Mesozoic rifting of the Atlantic margin.
APA, Harvard, Vancouver, ISO, and other styles
9

Meyers, Patrick M., Andrew Melatos, and Nicholas J. O’Neill. "Parameter estimation of a two-component neutron star model with spin wandering." Monthly Notices of the Royal Astronomical Society 502, no. 3 (February 1, 2021): 3113–27. http://dx.doi.org/10.1093/mnras/stab262.

Full text
Abstract:
ABSTRACT It is an open challenge to estimate systematically the physical parameters of neutron star interiors from pulsar timing data while separating spin wandering intrinsic to the pulsar (achromatic timing noise) from measurement noise and chromatic timing noise (due to propagation effects). In this paper, we formulate the classic two-component, crust-superfluid model of neutron star interiors as a noise-driven, linear dynamical system and use a state-space-based expectation–maximization method to estimate the system parameters using gravitational-wave and electromagnetic timing data. Monte Carlo simulations show that we can accurately estimate all six parameters of the two-component model provided that electromagnetic measurements of the crust angular velocity and gravitational-wave measurements of the core angular velocity are both available. When only electromagnetic data are available, we can recover the overall relaxation time-scale, the ensemble-averaged spin-down rate, and the strength of the white-noise torque on the crust. However, the estimates of the secular torques on the two components and white-noise torque on the superfluid are biased significantly.
APA, Harvard, Vancouver, ISO, and other styles
10

O'Leary, D. M., R. M. Clowes, and R. M. Ellis. "Crustal velocity structure in the southern Coast Belt, British Columbia." Canadian Journal of Earth Sciences 30, no. 12 (December 1, 1993): 2389–403. http://dx.doi.org/10.1139/e93-207.

Full text
Abstract:
We applied an iterative combination of two-dimensional traveltime inversion and amplitude forward modelling to seismic refraction data along a 350 km along-strike profile in the Coast Belt of the southern Canadian Cordillera to determine crust and upper mantle P-wave velocity structure. The crustal model features a thin (0.5–3.0 km) near-surface layer with an average velocity of 4.4 km/s, and upper-, middle-, and lower-crustal strata which are each approximately 10 km thick and have velocities ranging from 6.2 to 6.7 km/s. The Moho appears as a 2 km thick transitional layer with an average depth of 35 km and overlies an upper mantle with a poorly constrained velocity of over 8 km/s. Other interpretations indicate that this profile lies within a collision zone between the Insular superterrane and the ancient North American margin and propose two collision-zone models: (i) crustal delamination, whereby the Insular superterrane was displaced along east-vergent faults over the terranes below; and (ii) crustal wedging, in which interfingering of Insular rocks occurs throughout the crust. The latter model involves thick layers of Insular material beneath the Coast Belt profile, but crustal velocities indicate predominantly non-Insular material, thereby favoring the crustal delamination model. Comparisons of the velocity model with data from the proximate reflection lines show that the top of the Moho transition zone corresponds with the reflection Moho. Comparisons with other studies suggest that likely sources for intracrustal wide-angle reflections observed in the refraction data are structural features, lithological contrasts, and transition zones surrounding a region of layered porosity in the crust.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Velocity model of the crust"

1

Jiang, Wei Ping. "Determination of crustal velocity structures from teleseismic p waves." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25773.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Ma, Xiaofei. "USArray Imaging of North American Continental Crust." DigitalCommons@USU, 2017. https://digitalcommons.usu.edu/etd/6904.

Full text
Abstract:
The layered structure and bulk composition of continental crust contains important clues about its history of mountain-building, about its magmatic evolution, and about dynamical processes that continue to happen now. Geophysical and geological features such as gravity anomalies, surface topography, lithospheric strength and the deformation that drives the earthquake cycle are all directly related to deep crustal chemistry and the movement of materials through the crust that alter that chemistry. The North American continental crust records billions of years of history of tectonic and dynamical changes. The western U.S. is currently experiencing a diverse array of dynamical processes including modification by the Yellowstone hotspot, shortening and extension related to Pacific coast subduction and transform boundary shear, and plate interior seismicity driven by flow of the lower crust and upper mantle. The midcontinent and eastern U.S. is mostly stable but records a history of ancient continental collision and rifting. EarthScope’s USArray seismic deployment has collected massive amounts of data across the entire United States that illuminates the deep continental crust, lithosphere and deeper mantle. This study uses EarthScope data to investigate the thickness and composition of the continental crust, including properties of its upper and lower layers. One-layer and two-layer models of crustal properties exhibit interesting relationships to the history of North American continental formation and recent tectonic activities that promise to significantly improve our understanding of the deep processes that shape the Earth’s surface. Model results show that seismic velocity ratios are unusually low in the lower crust under the western U.S. Cordillera. Further modeling of how chemistry affects the seismic velocity ratio at temperatures and pressures found in the lower crust suggests that low seismic velocity ratios occur when water is mixed into the mineral matrix, and the combination of high temperature and water may point to small amounts of melt in the lower crust of Cordillera.
APA, Harvard, Vancouver, ISO, and other styles
3

Olivares, Espinosa Hugo. "Steady-state model of neutron star crust." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21975.

Full text
Abstract:
The advent of X-ray astronomy has turned the study of compact objects into one of the most active research fields in modern-day physics. Diverse luminosity phenomena have been remarked upon in neutron stars and it is believed that in many of them the neutron star crust plays a critical role. This work presents a steady-state model for the neutron star crust that describes, in particular, the profiles of temperature and flux along this region. It is divided as follows: First, a review of observational phenomena in neutron stars, where crust characteristics are thought to be crucial, are presented, alongside general aspects of the theoretical models applied. Second, the different elements that are needed to construct this model are considered. Third, the set of structure equations to be resolved and the calculations of the components of these equations are provided. Finally, the results are shown and discussed and the conclusion is presented.
L'avènement de l'astronomie des rayons X a transformé l'étude des objets compacts en un des champs de recherche des plus actifs en physique moderne. Divers phénomènes de luminosité ont été observés dans les étoiles neutron et on estime que la croûte de l'étoile neutron joue un rôle important dans beaucoup de ces phénomènes. Cet ouvrage présente un modèle d'équilibre stable pour la croûte de l'étoile neutron qui décrit, en particulier, les profiles de température et flux dans cette région. L'ouvrage est divisé comme suit: Premièrement, une révision des phénomènes observés dans les étoiles neutron, où les caractéristiques de la croûte sont supposées être cruciaux, est présentée, avec les aspects généraux des modèles théoriques utilisés. Deuxièmement, les différents éléments nécessaires pour construire ce modèle sont examinés. Troisièmement, l'ensemble des équations de structure à résoudre et les calculs des composantes de ces équations sont présentés. Finalement, les résultats sont montrés et discutés et la conclusion est présentée.
APA, Harvard, Vancouver, ISO, and other styles
4

Tay, Pui Leng. "Upper crustal velocity and structures from surface seismics : applications to the Mediterranean Ridge and West Orkney Basins." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314230.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

McCarthy, Emily Suzanne. "Investigating the velocity structure beneath the Southern and Central Atlantic : implications for evolution of oceanic crust and lithosphere." Thesis, University of Leicester, 2015. http://hdl.handle.net/2381/32528.

Full text
Abstract:
Presented here is the shear velocity structure of the crust and upper mantle beneath the central and southern Atlantic Ocean from inversion of high resolution group velocity tomography. The path average group velocities from Rayleigh waves were picked using multi filter technique and phase match filtering for 14,000 paths. They were then combined within a tomographic inversion, to obtain the regional variations of velocity structure at a range of short to intermediate periods (14 s - 100 s). These group velocities have depth sensitivities from the surface to approximately 90 km depth, constraining the focus to velocity variations within the crust and mantle lithosphere. Tomographic results highlight short wavelength variations at periods sensitive to shallow depths, implying the possibility for a more complex velocity structure than currently expected for the oceanic region. The results show a clear relationship between increasing group velocities and increasing sea floor age. Group models are then inverted to obtain the shear velocity structure with respect to depth. The shear velocity model highlights slow velocities beneath the ridge, interpreted as the upwelling of asthenosphere between depths between 30 km and 50 km. Models of crustal and lithospheric thickness are extrapolated from the data. These models suggest the evolution of the Atlantic Ocean is more complex than the simple mathematical cooling models. It is suggested that the main control on crustal thickness is tectonic processes associated with the slow spreading rate and not controlled by to the mantle potential temperature. Additionally, results are presented which incorporate 2 azimuthal anisotropy in the tomographic inversions. At the longest periods test show that the recovered anisotropy is an artefact of the inversion process, and cannot be interpreted in terms of mantle flow. At the shortest periods there is a possible relationship between the fast direction and the stress field.
APA, Harvard, Vancouver, ISO, and other styles
6

Christodoulou, Apostolos A. "Etude sismotectonique et inversion tridimensionnelle en Grèce du Nord." Grenoble 1, 1986. http://www.theses.fr/1986GRE10086.

Full text
Abstract:
Première Partie: Etude sismotectonique d'un graben complexe, exemple: le graben Mygdonien (Grèce du Nord). Durant les printemps de 1984 et 1985 nous avons installé un réseau sismologique de 29 stations portables dans la région du graben Mydgonien près de Thessaloniki. La sismicité et les mécanismes au foyer ont montré une structure complexe. Des phénomènes compressifs ont été observés au centre du graben. Nous proposons un modèle pour la formation et l'évolution du graben. Au départ la déformation a lieu le long des failles pré-existantes de direction NW-SE ou NNE-SSW avec des mouvements normaux ou décrochants. Dans une deuxième étape il y a formation d'une nouvelle famille de failles normales, dirigées E-W. Cette famille a une direction perpendiculaire à l'axe T moyen, trouvé par les mécanismes au foyer et vient se superposer aux failles initiales. Elle devient rapidement la famille principale et les failles initiales jouent un rôle d'ajusteur de déformation dans cet ensemble. En outre les anciennes failles fonctionnent comme des barrières à l'évo lution des failles dirigées E-W. Deuxième partie: Etudes tridimensionnelle de la croûte et du manteau supérieur à partir de l'inversion des ondes P des téléséismes. A partir des résidus relatifs de temps de parcours des ondes P des téléséismes, enregistrés par le réseau permanent du laboratoire de Géophysique de Thessaloniki, nous avons tenté une inversion tridimensionnelle selon la méthode de Aki, Christofferson et Husebye. Nous avons obtenu des modèles de vitesse en 3D pour les ondes P sous la Grèce du nord, jusqu'à une profondeur de 250 km. Nous avons essayé d'expliquer les variations latérales des vitesses observées, à l'aide de l'isostasie, du flux de chaleur et de la sismicité
APA, Harvard, Vancouver, ISO, and other styles
7

Salstrand, Daniel Koewing. "A mathematical model for magma-hydrothermal systems in the oceanic crust." Thesis, Georgia Institute of Technology, 1989. http://hdl.handle.net/1853/25700.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Håkman, Olof. "Boltzmann Equation and Discrete Velocity Models : A discrete velocity model for polyatomic molecules." Thesis, Karlstads universitet, Institutionen för matematik och datavetenskap (from 2013), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-76143.

Full text
Abstract:
In the study of kinetic theory and especially in the study of rarefied gas dynamics one often turns to the Boltzmann equation. The mathematical theory developed by Ludwig Boltzmann was at first sight applicable in aerospace engineering and fluid mechanics. As of today, the methods in kinetic theory are extended to other fields, for instance, molecular biology and socioeconomics, which makes the need of finding efficient solution methods still important. In this thesis, we study the underlying theory of the continuous and discrete Boltzmann equation for monatomic gases. We extend the theory where needed, such that, we cover the case of colliding molecules that possess different levels of internal energy. Mainly, we discuss discrete velocity models and present explicit calculations for a model of a gas consisting of polyatomic molecules modelled with two levels of internal energy.
I studiet av kinetisk teori och speciellt i studiet av dynamik för tunna gaser vänder man sig ofta till Boltzmannekvationen. Den matematiska teorien utvecklad av Ludwig Boltzmann var vid första anblicken tillämpbar i flyg- och rymdteknik och strömningsmekanik. Idag generaliseras metoder i kinetisk teori till andra områden, till exempel inom molekylärbiologi och socioekonomi, vilket gör att vi har ett fortsatt behov av att finna effektiva lösningsmetoder. Vi studerar i denna uppsats den underliggande teorin av den kontinuerliga och diskreta Boltzmannekvationen för monatomiska gaser. Vi utvidgar teorin där det behövs för att täcka fallet då kolliderande molekyler innehar olika nivåer av intern energi. Vi diskuterar huvudsakligen diskreta hastighetsmodeller och presenterar explicita beräkningar för en modell av en gas bestående av polyatomiska molekyler modellerad med två lägen av intern energi.
APA, Harvard, Vancouver, ISO, and other styles
9

Berg, Peter. "Optimal-velocity models of motorway traffic." Thesis, University of Bristol, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.367664.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Makin, Alexis David James. "Velocity memory." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/velocity-memory(c5c1c28d-0a23-44a5-93bc-21f993d2e7ad).html.

Full text
Abstract:
It is known that primates are sensitive to the velocity of moving objects. We can also remember velocity information after moving objects disappear. This cognitive faculty has been investigated before, however, the literature on velocity memory to date has been fragmented. For example, velocity memory has been disparately described as a system that controls eye movements and delayed discrimination. Furthermore, velocity memory may have a role in motion extrapolation, i.e. the ability to judge the position of a moving target after it becomes occluded. This thesis provides a unifying account of velocity memory, and uses electroencephalography (EEG) to explore its neural basis. In Chapter 2, the relationship between oculomotor control and motion extrapolation was investigated. Two forms of motion extrapolation task were presented. In the first, participants observed a moving target disappear then reappear further along its path. Reappearance could be at the correct time, too early or too late. Participants discriminated reappearance error with a two-alternative forced choice button press. In the second task, participants saw identical targets travel behind a visible occluder, and they attempted to press a button at the exact time that it reached the other side. Tasks were completed under fixation and free viewing conditions. The accuracy of participant's judgments was reduced by fixation in both tasks. In addition, eye movements were systematically related to behavioural responses, and small eye movements during fixation were affected by occluded motion. These three results imply that common velocity memory and pre-motor systems mediate eye movements and motion extrapolation. In Chapter 3, different types of velocity representation were explored. Another motion extrapolation task was presented, and targets of a particular colour were associated with fast or slow motion. On identical-velocity probe trials, colour still influenced response times. This indicates that long-term colour-velocity associations influence motion extrapolation. In Chapter 4, interference between subsequently encoded velocities was explored. There was robust interference between motion extrapolation and delayed discrimination tasks, suggesting that common processes are involved in both. In Chapter 5, EEG was used to investigate when memory-guided tracking begins during motion extrapolation. This study compared conditions where participants covertly tracked visible and occluded targets. It was found that a specific event related potential (ERP) appeared around 200 ms post occlusion, irrespective of target location or velocity. This component could delineate the onset of memory guided tracking during occlusion. Finally, Chapter 6 presents evidence that a change in alpha band activity is associated with information processing during motion extrapolation tasks. In light of these results, it is concluded that a common velocity memory system is involved a variety of tasks. In the general discussion (Chapter 7), a new account of velocity memory is proposed. It is suggested that a velocity memory reflects persistent synchronization across several velocity sensitive neural populations after stimulus offset. This distributed network is involved in sensory-motor integration, and can remain active without visual input. Theoretical work on eye movements, delayed discrimination and motion extrapolation could benefit from this account of velocity memory.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Velocity model of the crust"

1

Distinguished Instructor Short Course (2nd 1999 Tulsa, Okla.). The seismic velocity model as an interpretation asset. Tulsa, OK: Society of Exploration Geophysicists, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Simon, Frederick F. Jet model for slot film cooling with effect of free-stream and coolant turbulence. Cleveland, Ohio: Lewis Research Center, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Berry, John D. Unsteady velocity measurements taken behind a model helicopter rotor hub in forward flight. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Laenen, Antonius. Simulation of three lahars in the Mount St. Helens area, Washington using a one-dimensional, unsteady-state streamflow model. Portland, Or: Dept. of the Interior, U.S. Geological Survey, 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Swift, Calvin T. Development of a validation model for the Defense meteorological satellite program's special sensor microwave imager. [Washington, DC: National Aeronautics and Space Administration, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Khazanehdari, Jalal. A model of the velocity structure of the Ivrea-Verbano lower crustal section, Northern Italy. Manchester: University of Manchester, 1996.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bollinger, G. A. Development of a velocity model for locating aftershocks in the Sierra Pie de Palo region of western Argentina. Washington: U.S. G.P.O., 1988.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Lemon, Michael R. Comparison of Los Alamos National Laboratory (LANL) Parallel Ocean Program (POP) model velocity fields with Pacific surface drifter measurements. Monterey, Calif: Naval Postgraduate School, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Fernando, Alvarez. On the sluggish response of prices to money in an inventory-theoretic model of money demand. Cambridge, Mass: National Bureau of Economic Research, 2003.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Pelton, Jimmy W. A comparison of output from the Los Alamos National Laboratory (LANL) Parallel Ocean Program (POP) model with surface velocity data from drifting Buoys in the North Atlantic Ocean. Monterey, Calif: Naval Postgraduate School, 2000.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Velocity model of the crust"

1

Holliger, Klaus, and John A. Goff. "A Generic Model for the 1/f-Nature of Seismic Velocity Fluctuations." In Heterogeneity in the Crust and Upper Mantle, 131–54. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0103-9_5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Tarakanov, R. Z., and N. V. Leviy. "A Model for the Upper Mantle with Several Channels of Low Velocity and Strength." In The Crust and Upper Mantle of the Pacific Area, 43–50. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm012p0043.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Gajewski, Dirk. "Compressional and Shear-Wave Velocity Models of the Schwarzwald Derived from Seismic Refraction Data." In Exploration of the Deep Continental Crust, 363–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74588-1_15.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Ruzhich, Valery V., and Evgeny V. Shilko. "A New Method for Seismically Safe Managing of Seismotectonic Deformations in Fault Zones." In Springer Tracts in Mechanical Engineering, 45–66. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_3.

Full text
Abstract:
AbstractThe authors outline the results of long-term interdisciplinary research aimed at identifying the possibility and the methods of controlling tangential displacements in seismically dangerous faults to reduce the seismic risk of potential earthquakes. The studies include full-scale physical and numerical modeling of P-T conditions in the earth’s crust contributing to the initiation of displacement in the stick-slip regime and associated seismic radiation. A cooperation of specialists in physical mesomechanics, seismogeology, geomechanics, and tribology made it possible to combine and generalize data on the mechanisms for the formation of the sources of dangerous earthquakes in the highly stressed segments of faults. We consider the prospect of man-caused actions on the deep horizons of fault zones using powerful shocks or vibrations in combination with injecting aqueous solutions through deep wells to manage the slip mode. We show that such actions contribute to a decrease in the coseismic slip velocity in the fault zone, and, therefore, cause a decrease in the amplitude and energy of seismic vibrations. In conclusion, we substantiate the efficiency of the use of combined impacts on potentially seismically hazardous segments of fault zones identified in the medium-term seismic prognosis. Finally, we discuss the importance of the full-scale validation of the proposed approach to managing the displacement regime in highly-stressed segments of fault zones. Validation should be based on large-scale tests involving advanced technologies for drilling deep multidirectional wells, injection of complex fluids, and localized vibrational or pulse impacts on deep horizons.
APA, Harvard, Vancouver, ISO, and other styles
5

Marquis, Guy, and Roy D. Hyndman. "Velocity-resistivity correlations in the deep crust." In Continental Lithosphere: Deep Seismic Reflections, 329–33. Washington, D. C.: American Geophysical Union, 1991. http://dx.doi.org/10.1029/gd022p0329.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Magnitsky, V. A., and V. N. Zharkov. "Low-Velocity Layers in the Upper Mantle." In The Earth's Crust and Upper Mantle, 664–75. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm013p0664.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

VaněK, Jiřř. "Upper Mantle Structure and Velocity Distribution in Eurasia." In The Earth's Crust and Upper Mantle, 246–50. Washington, D. C.: American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm013p0246.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Schmoll, J., R. Bittner, H. J. Dürbaum, T. Heinrichs, R. Meißner, C. Reichert, T. Rühl, and H. Wiederhold. "Oberpfalz Deep Seismic Reflection Survey and Velocity Studies." In Exploration of the Deep Continental Crust, 99–149. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74588-1_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Long, Leland T., and Jeih-San Liow. "Crustal thickness, velocity structure, and the isostatic response function in the southern Appalachians." In Reflection Seismology: The Continental Crust, 215–22. Washington, D. C.: American Geophysical Union, 1986. http://dx.doi.org/10.1029/gd014p0215.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Okumura, A., and S. Tadaki. "Asymmetric Optimal Velocity Model." In Traffic and Granular Flow’01, 115–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-662-10583-2_11.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Velocity model of the crust"

1

Zheng, Xuefeng, Yuwei Sun, and Xiong Xu. "Data Management and Three-dimensional Visualization of Global Velocity Model Crust 2.0." In International Conference on Promotion of Information Technology (ICPIT 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icpit-16.2016.1.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kovalevsky, Valery V., Lyudmila P. Braginskaya, and Andrey P. Grigoryuk. "An information technology of verification of earth's crust velocity models." In 2016 13th International Scientific-Technical Conference on Actual Problems of Electronics Instrument Engineering (APEIE). IEEE, 2016. http://dx.doi.org/10.1109/apeie.2016.7806369.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Zhang, Yongqian, Qingtian Lü, Jiayong Yan, and Jinhua Zhao. "Composition model of the deep crust beneath the Middle and Lower Reaches of the Yangtze River Metallogenic Belt in China, based on seismic velocity, gravity and heat flow data." In International Workshop and Gravity, Electrical & Magnetic Methods and their Applications, Chenghu, China, 19-22 April 2015. Society of Exploration Geophysicists and and Chinese Geophysical Society, 2015. http://dx.doi.org/10.1190/gem2015-067.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Birknes, Jørn, Øistein Hagen, Thomas B. Johannessen, Øystein Lande, and Arne Nestegård. "Second-Order Kinematics Underneath Irregular Waves." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11629.

Full text
Abstract:
The present paper is concerned with the prediction of horizontal velocities underneath measured irregular wave surface elevations. The simple case of unidirectional waves in deep water is considered. The main challenge in calculating accurately the kinematics in the crest region is related to the treatment of the contribution from wave components with frequencies much higher than the frequencies near the spectral peak. When using linear or weakly nonlinear perturbation methods, the wave components are superimposed at the still water level and it is necessary to truncate the tail of the spectrum in order to calculate accurately the velocity in the crest region. In the present paper, results from three methods of calculating the crest kinematics are compared with the model test results of Skjelbreia et al. [1]: • The second-order model of Stansberg et al. [5] which truncates consistently the high frequency part of the spectrum. • The second-order model of Johannessen [13] which calculates the velocity directly at the instantaneous free surface. • The Wheeler [3] stretching method which stretches the linear velocity profile from the still water level to the instantaneous free surface. In addition to comparing the horizontal velocity profiles underneath the crest, time traces of horizontal velocity is compared at the free surface in the vicinity of a large crest. The latter comparison highlights the differences between the models and the challenge of accurate predictions close to top of crest. All three models show a reasonable agreement with model test results although it is clear that the first two methods are superior to the Wheeler method.
APA, Harvard, Vancouver, ISO, and other styles
5

Kazemnia Kakhki, M., and M. Ansaripour. "Crust Velocity Structure of Bushehr." In 77th EAGE Conference and Exhibition 2015. Netherlands: EAGE Publications BV, 2015. http://dx.doi.org/10.3997/2214-4609.201412463.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Sproson, Richard A. "Extreme Values of Total Water Level and Total Water Velocity in the Arabian Gulf." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57152.

Full text
Abstract:
PERGOS hindcast model data from the north-east coast of Qatar has been analysed in order to estimate extreme values of total water level (crest height + surge height) and total water velocity (wave orbital velocity + in-line current velocity) based on analysis of 103 storms that occurred between 1961 and 2002. The PERGOS hindcast includes significant wave height, peak period, mean wave direction, surge height, depth-mean current speed and depth-mean current direction. Crest height has been derived from the source parameters using Fugro GEOS’ proprietary EXWAN program. Wave orbital velocity has been derived using stream function theory. Extreme values of total water level and total water velocity were estimated by: (i) univariate extremal analysis of the structure variable components, (ii) univariate extremal analysis of the structure variable, and (iii) bivariate extremal analysis of the structure variable components using Fugro GEOS’ proprietary GTMFIT program. The effect of the lag between the peak wave, current and surge events on extreme values of total water level and total water velocity has also been assessed. A reduction in the 10,000-year extreme water velocity of 14–21% and a reduction in the 10,000-year extreme water level of 3–14% have been achieved using the structure variable methods.
APA, Harvard, Vancouver, ISO, and other styles
7

Miassoedov, Alexei, Thomas Cron, Jerzy Foit, Xiaoyang Gaus-Liu, Silke Schmidt-Stiefel, and Thomas Wenz. "LIVE Experiments on Melt Behavior in the RPV Lower Head." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48650.

Full text
Abstract:
Behavior of the corium pool in the lower head is still a critical issue in understanding of PWR core meltdown accidents. One of the key parameter for assessing the vessel mechanical strength is the resulting heat flux at the pool-vessel interface. A number of studies [1]–[3] have already been performed to pursue the understanding of a severe accident with core melting, its course, major critical phases and timing and the influence of these processes on the accident progression. Uncertainties in modeling these phenomena and in the application to reactor scale will undoubtedly persist. These include e.g. formation and growth of the in-core melt pool, relocation of molten material after the failure of the surrounding crust, characteristics of corium arrival in residual water in the lower head, corium stratifications in the lower head after the debris re-melting [4]. These phenomena have a strong impact on a potential termination of a severe accident. The main objective of the LIVE program [5] at FZK is to study the core melt phenomena both experimentally in large-scale 3D geometry and in supporting separate-effects tests, and analytically using CFD codes in order to provide a reasonable estimate of the remaining uncertainty band under the aspect of safety assessment. Within the LIVE experimental program several tests have been performed with water and with non-eutectic melts (mixture of KNO3 and NaNO3) as simulant fluids. The results of these experiments, performed in nearly adiabatic and in isothermal conditions, allow a direct comparison with findings obtained earlier in other experimental programs (SIMECO, ACOPO, BALI, etc.) and will be used for the assessment of the correlations derived for the molten pool behavior. The information obtained from the LIVE experiments includes heat flux distribution through the reactor pressure vessel wall in transient and steady state conditions, crust growth velocity and dependence of the crust formation on the heat flux distribution through the vessel wall. Supporting post-test analysis contributes to characterization of solidification processes of binary non-eutectic melts. Complimentary to other international programs with real corium melts, the results of the LIVE activities provide data for a better understanding of in-core corium pool behavior. The experimental results are being used for development of mechanistic models to describe the in-core molten pool behavior and their implementation in the severe accident codes like ASTEC. The paper summarizes the objectives of the LIVE program and presents the main results obtained in the LIVE experiments up to now.
APA, Harvard, Vancouver, ISO, and other styles
8

Rimbert, Nicolas, M. Hadj-Achour, and M. Gradeck. "Liquid-Liquid Secondary Fragmentation with Solidification." In ILASS2017 - 28th European Conference on Liquid Atomization and Spray Systems. Valencia: Universitat Politècnica València, 2017. http://dx.doi.org/10.4995/ilass2017.2017.5034.

Full text
Abstract:
In the event of a hypothetical core disruptive accident in nuclear power plants, the molten core may flow out thereactor vessel and interact with the cold water. The evolution of the accident is strongly affected by the fragmentation of the jet of molten metallic fuel due to its interaction with the water (i.e. this situation is known as fuel coolant interaction, FCI). In order to evaluate and predict the various consequences of a FCI, many researches are conducted with either corium or high melting temperature molten metal, where premixing stage evolves with an important production of steam. This steam production that is unavoidable because the high temperature of corium leads to difficulties for using optical diagnostics. Hence, in our case, we use a eutectic alloy (Field’s metal) with a low melting point (62°C) in order to be able to visualize correctly the droplet fragmentation processes.The present work focuses on the fragmentation of a single Field’s metal liquid droplet with mass equals to 0.27g (±0.01g). The liquid droplet interacts with a water pool whose temperature range between 20°C to 60°C. According to its Weber number, it fragments in different ways. For each experiment, a single droplet has been visualized using a high-speed camera (at 8000 fps). All measurements (drop size, velocity, impact parameter and geometrical properties of the drops after the penetration) into the pool are evaluated using an open source image processing. Solidified fragments can then be sieved and the size PDF determined. Focus of the present work is put on the evolution of the Sauter Mean Diameter with increasing Weber number and varying bath pool temperature. It is shown that using a simple crust model during solidification and defining an effective Weber number which include the crust elasticity all the curves collapse on the same master curve for all the water bathtemperature considered.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.5034
APA, Harvard, Vancouver, ISO, and other styles
9

Muthanna, Chittiappa, Carl Trygve Stansberg, Rolf Baarholm, Astrid Harendza, and Mia Priscic. "Experimental Study of the Local Wave Velocity Field During a Wave Impact Occurrence." In ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2009. http://dx.doi.org/10.1115/omae2009-79375.

Full text
Abstract:
The velocity field in the wave crest zone during wave impact phenomena was successfully measured using a 2 component PIV technique with a simplified two dimensional box model in a wave tank. Measurements were made for two different regular wave conditions and of the undisturbed wave field for the two wave conditions in order to study the influence of the modeled platform deck. The measurements of the wave velocity field showed that for the higher amplitude wave condition, vertical velocity components were amplified in the wave run up region, and away from this region, were not as heavily influenced as the horizontal velocity component. For the smaller wave amplitude vertical velocity components were reduced slightly, whereas the horizontal velocity components did not seem to be influenced. The measurements showed that the PIV technique is a practical and feasible tool in which to study and measure the wave velocity field, but it does come with some limitations.
APA, Harvard, Vancouver, ISO, and other styles
10

Lei, Zhijun, Ali Mahallati, Mark Cunningham, and Patrick Germain. "Influence of Inlet Swirl on the Aerodynamics of a Model Turbofan Lobed Mixer." In ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-39116.

Full text
Abstract:
This paper presents a detailed experimental investigation of the influence of core flow inlet swirl on the mixing and performance of a 12-lobe un-scalloped turbofan mixer. Measurements were made downstream of the mixer in a co-annular wind tunnel. The core-to-bypass velocity ratio was set to 2:1, temperature ratio to 1.0, and pressure ratio to 1.03, giving a Reynolds number of 5.2×105, based on the core flow inlet velocity and equivalent hydraulic diameter. In the core flow, the background turbulence intensity was raised to 5% and the swirl angle was varied using five vane geometries, with nominally uniform swirl angles of 0°, 5°, 10°, 20° and 30°. Flow measurements captured flow structures involved in the mixing process. Most of mixing took place immediately downstream of the exit nozzle. The vane wake slightly enhanced large scale mixing of streamwise vortices. At low swirl angles, mixing was found to be mainly due to the interaction between streamwise vortices and normal vortices. At high swirl angles, the lobed mixer acted similar to a guide vane and removed most of the inlet swirl between the crest and trough of the mixer. However, the upstream swirling flow persisted in the core region between the center-body and lobed mixer trough, causing a reverse flow zone downstream of the centre-body. As the reversed flow became larger with increasing swirl, the swirling flow in the core region moved radially outwards and further interacted with the outer region flow. The stronger interaction of streamwise vortices with normal vortex improved mixing from the trough to the crest of the lobed mixer. The balance between enhanced mixing and increased reversed flow downstream of the centre-body, resulted in increased overall total pressure losses with increasing inlet swirl angles.
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Velocity model of the crust"

1

Symes, William W. Layered Velocity Inversion: A Model Problem from Reflection Seismology. Fort Belvoir, VA: Defense Technical Information Center, October 1988. http://dx.doi.org/10.21236/ada455256.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Robin, C. M. I., M. Craymer, R. Ferland, T. S. James, E. Lapelle, M. Piraszewski, and Y. Zhao. NAD83v70VG: a new national crustal velocity model for Canada. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2020. http://dx.doi.org/10.4095/327592.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Toksoez, M. N., and Youshun Sun. P and S Wave Velocity Structure of the Crust and Upper Mantle Under China and Surrounding Areas From Body and Surface Wave Tomography. Fort Belvoir, VA: Defense Technical Information Center, March 2008. http://dx.doi.org/10.21236/ada486734.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Viecelli, J. A. Thermal blooming threshold computations with a Markov model of velocity turbulence. Office of Scientific and Technical Information (OSTI), November 1988. http://dx.doi.org/10.2172/6285080.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Rohay, Alan C., and Thomas M. Brouns. Site-Specific Velocity and Density Model for the Waste Treatment Plant, Hanford, Washington. Office of Scientific and Technical Information (OSTI), June 2007. http://dx.doi.org/10.2172/912736.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Hoppel, William A., Peter Caffrey, and Glendon M. Frick. Addition of Vertical Velocity to a One-Dimensional Aerosol and Trace Gas Model. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada430126.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Chesnakas, Christopher J. Velocity Measurements Through the Pump of the X-Craft Tow Tank Model 5612. Fort Belvoir, VA: Defense Technical Information Center, May 2007. http://dx.doi.org/10.21236/ada470270.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Smith, Kevin B. Numerical Studies of Acoustic Particle Velocity and Acoustic Variability with a SSF/PE Model. Fort Belvoir, VA: Defense Technical Information Center, September 2006. http://dx.doi.org/10.21236/ada612414.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Chesnakas, Christopher J. Velocity Measurements Inside the Pump of the Gulf Coast Waterjet Tow Tank Model 5600. Fort Belvoir, VA: Defense Technical Information Center, February 2003. http://dx.doi.org/10.21236/ada415284.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Iwasaki, T., and H. Shimamura. Velocity structure model determined from onshore-offshore seismic profiling across Vancouver Island and adjacent continental margin. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1990. http://dx.doi.org/10.4095/129019.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Velocity model of the crust' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography