Zobrazeno 1 - 10
of 114
pro vyhledávání: '"Imagerie sismique"'
Autor:
Desquilbet, François
Publikováno v:
Geophysics [physics.geo-ph]. Université Grenoble Alpes [2020-..], 2022. English. ⟨NNT : 2022GRALM055⟩
The first arrival traveltime for the propagation of a wave, in the high frequency approximation, is described by the eikonal equation, or possibly a variant with coefficients depending on the medium properties. We present numerical schemes for the co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______165::738aafb98a9bd7f464453f2c100ea463
https://theses.hal.science/tel-04112041/document
https://theses.hal.science/tel-04112041/document
Autor:
Hussni, Sara Ghalya
Publikováno v:
Sciences de la Terre. Université Côte d'Azur, 2021. Français. ⟨NNT : 2021COAZ4049⟩
The study of crustal structures in subduction zones by seismic imaging has always been a challenge. Their complexity and the depth of the objectives generally pursued mean that good imaging quality can only be achieved by using acquisitions that cove
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::556ce8b78c6d23869f986edaa3b847c5
https://tel.archives-ouvertes.fr/tel-03463095/file/2021COAZ4049.pdf
https://tel.archives-ouvertes.fr/tel-03463095/file/2021COAZ4049.pdf
Autor:
Sambolian, Serge
Publikováno v:
Earth Sciences. Université Côte d'Azur, 2021. English. ⟨NNT : 2021COAZ4002⟩
Velocity model building is a key step of seismic imaging since inferring high-resolution subsurface model by migration or full waveform inversion (FWI) is highly dependent on the kinematic accuracy of the retrieved velocity model. Stereotomography, a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::dd7d53a6c121b1a826761c4dc2527490
https://theses.hal.science/tel-03267676/file/2021COAZ4002.pdf
https://theses.hal.science/tel-03267676/file/2021COAZ4002.pdf
Autor:
Van dinther, Chantal
Publikováno v:
Earth Sciences. Université Grenoble Alpes [2020-..], 2021. English. ⟨NNT : 2021GRALU014⟩
Intrinsic absorption and scattering properties provide us with information about the physical state and heterogeneity of the Earth's crust. Moreover, they are important input parameters for spatial sensitivity kernels in coda wave monitoring applicat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::e865b6bd71a2bda28e00c11990e20c53
https://theses.hal.science/tel-03275905
https://theses.hal.science/tel-03275905
Autor:
Gao, Guochao
Publikováno v:
Earth Sciences. Ecole Centrale Marseille, 2020. English. ⟨NNT : 2020ECDM0010⟩
Due to various geological processes and crustal movements, rough interfaces widely exist within the Earth. The rough interface can strongly affect seismic wave propagation, manifested as changes in the amplitude, phase, scattering angle, frequency co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::f25519a3e74f7673cda20bbc0aa42463
https://theses.hal.science/tel-03215030
https://theses.hal.science/tel-03215030
Autor:
Zhou, Tianyou
Publikováno v:
Géophysique [physics.geo-ph]. Université Paris sciences et lettres, 2020. Français. ⟨NNT : 2020UPSLM046⟩
Seismic imaging is the technique used to determine the structures of the subsurface from seismic signals. One of the most important parameters is the velocity model, that can be split into the macromodel controlling the kinematics of wave propagation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2592::8de28b77db8835a66103fb1c6d805fbe
https://pastel.archives-ouvertes.fr/tel-03135664
https://pastel.archives-ouvertes.fr/tel-03135664
Publikováno v:
Geophysics [physics.geo-ph]. COMUE Université Côte d'Azur (2015-2019); University of Teheran, 2019. English. ⟨NNT : 2019AZUR4090⟩
Full Waveform Inversion (FWI) is a PDE-constrained optimization which reconstructs subsurface parameters from sparse measurements of seismic wavefields. FWI generally relies on local optimization techniques and a reduced-space approach where the wave
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::9e96f8ee07779eadc8edbd1aa60b65d2
https://theses.hal.science/tel-02870242
https://theses.hal.science/tel-02870242
Autor:
Jiang, Hao
L’atténuation sismique est un paramètre physique très utile pour décrire et imager les propriétés du sous-sol, et tout particulièrement les roches saturées et les nuages de gaz. Les approches classiques analysent l’amplitude du spectre de
Externí odkaz:
http://www.theses.fr/2019PSLEM013/document
Autor:
Jiang, Hao
Publikováno v:
Earth Sciences. Université Paris sciences et lettres, 2019. English. ⟨NNT : 2019PSLEM013⟩
Seismic attenuation is a useful physical parameter to describe and to image the properties of specific geological bodies, e.g., saturated rocks and gas clouds. Classical approaches consist of analyzing seismic spectrum amplitudes or spectrum distorti
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od_______212::f77ddfef469ed201847b0d9a9f9f21ea
https://pastel.archives-ouvertes.fr/tel-02310410/document
https://pastel.archives-ouvertes.fr/tel-02310410/document
Autor:
Irakarama, Modeste
Les modèles géologiques sont couramment utilisés pour estimer les ressources souterraines, pour faire des simulations numériques, et pour évaluer les risques naturels ; il est donc important que les modèles géologiques représentent la géomé
Externí odkaz:
http://www.theses.fr/2019LORR0060/document