On the practical convergence of coda-based correlations: a window optimization approach
International audience We present a novel optimization approach to improve the convergence of interstation coda correlation functions towards the medium's empirical Green's function. For two stations recording a series of impulsive events in a multiply scattering medium, we explore the imp...
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Online Access: | https://insu.hal.science/insu-03596388 https://insu.hal.science/insu-03596388/document https://insu.hal.science/insu-03596388/file/ggv476.pdf https://doi.org/10.1093/gji/ggv476 |
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ftccsdartic:oai:HAL:insu-03596388v1 2023-09-05T13:14:02+02:00 On the practical convergence of coda-based correlations: a window optimization approach Chaput, J. Clerc, V. Campillo, M. Roux, P. Knox, H. Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) 2016 https://insu.hal.science/insu-03596388 https://insu.hal.science/insu-03596388/document https://insu.hal.science/insu-03596388/file/ggv476.pdf https://doi.org/10.1093/gji/ggv476 en eng HAL CCSD Oxford University Press (OUP) info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggv476 insu-03596388 https://insu.hal.science/insu-03596388 https://insu.hal.science/insu-03596388/document https://insu.hal.science/insu-03596388/file/ggv476.pdf BIBCODE: 2016GeoJI.204.736C doi:10.1093/gji/ggv476 http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://insu.hal.science/insu-03596388 Geophysical Journal International, 2016, 204, pp.736-747. ⟨10.1093/gji/ggv476⟩ Inverse theory Interferometry Volcano seismology Antarctica [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftccsdartic https://doi.org/10.1093/gji/ggv476 2023-08-12T22:58:43Z International audience We present a novel optimization approach to improve the convergence of interstation coda correlation functions towards the medium's empirical Green's function. For two stations recording a series of impulsive events in a multiply scattering medium, we explore the impact of coda window selection through a Markov Chain Monte Carlo scheme, with the aim of generating a gather of correlation functions that is the most coherent and symmetric over events, thus recovering intuitive elements of the interstation Green's function without any nonlinear post-processing techniques. This approach is tested here for a 2-D acoustic finite difference model, where a much improved correlation function is obtained, as well as for a database of small impulsive icequakes recorded on Erebus Volcano, Antarctica, where similar robust results are shown. The average coda solutions, as deduced from the posterior probability distributions of the optimization, are further representative of the scattering strength of the medium, with stronger scattering resulting in a slightly delayed overall coda sampling. The recovery of singly scattered arrivals in the coda of correlation functions are also shown to be possible through this approach, and surface wave reflections from outer craters on Erebus volcano were mapped in this fashion. We also note that, due to the improvement of correlation functions over subsequent events, this approach can further be used to improve the resolution of passive temporal monitoring. Article in Journal/Newspaper Antarc* Antarctica Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Geophysical Journal International 204 2 736 747 |
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Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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ftccsdartic |
language |
English |
topic |
Inverse theory Interferometry Volcano seismology Antarctica [SDU]Sciences of the Universe [physics] |
spellingShingle |
Inverse theory Interferometry Volcano seismology Antarctica [SDU]Sciences of the Universe [physics] Chaput, J. Clerc, V. Campillo, M. Roux, P. Knox, H. On the practical convergence of coda-based correlations: a window optimization approach |
topic_facet |
Inverse theory Interferometry Volcano seismology Antarctica [SDU]Sciences of the Universe [physics] |
description |
International audience We present a novel optimization approach to improve the convergence of interstation coda correlation functions towards the medium's empirical Green's function. For two stations recording a series of impulsive events in a multiply scattering medium, we explore the impact of coda window selection through a Markov Chain Monte Carlo scheme, with the aim of generating a gather of correlation functions that is the most coherent and symmetric over events, thus recovering intuitive elements of the interstation Green's function without any nonlinear post-processing techniques. This approach is tested here for a 2-D acoustic finite difference model, where a much improved correlation function is obtained, as well as for a database of small impulsive icequakes recorded on Erebus Volcano, Antarctica, where similar robust results are shown. The average coda solutions, as deduced from the posterior probability distributions of the optimization, are further representative of the scattering strength of the medium, with stronger scattering resulting in a slightly delayed overall coda sampling. The recovery of singly scattered arrivals in the coda of correlation functions are also shown to be possible through this approach, and surface wave reflections from outer craters on Erebus volcano were mapped in this fashion. We also note that, due to the improvement of correlation functions over subsequent events, this approach can further be used to improve the resolution of passive temporal monitoring. |
author2 |
Institut des Sciences de la Terre (ISTerre) Université Joseph Fourier - Grenoble 1 (UJF)-Institut Français des Sciences et Technologies des Transports, de l'Aménagement et des Réseaux (IFSTTAR)-Institut national des sciences de l'Univers (INSU - CNRS)-Institut de recherche pour le développement IRD : UR219-PRES Université de Grenoble-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Chaput, J. Clerc, V. Campillo, M. Roux, P. Knox, H. |
author_facet |
Chaput, J. Clerc, V. Campillo, M. Roux, P. Knox, H. |
author_sort |
Chaput, J. |
title |
On the practical convergence of coda-based correlations: a window optimization approach |
title_short |
On the practical convergence of coda-based correlations: a window optimization approach |
title_full |
On the practical convergence of coda-based correlations: a window optimization approach |
title_fullStr |
On the practical convergence of coda-based correlations: a window optimization approach |
title_full_unstemmed |
On the practical convergence of coda-based correlations: a window optimization approach |
title_sort |
on the practical convergence of coda-based correlations: a window optimization approach |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://insu.hal.science/insu-03596388 https://insu.hal.science/insu-03596388/document https://insu.hal.science/insu-03596388/file/ggv476.pdf https://doi.org/10.1093/gji/ggv476 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0956-540X EISSN: 1365-246X Geophysical Journal International https://insu.hal.science/insu-03596388 Geophysical Journal International, 2016, 204, pp.736-747. ⟨10.1093/gji/ggv476⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1093/gji/ggv476 insu-03596388 https://insu.hal.science/insu-03596388 https://insu.hal.science/insu-03596388/document https://insu.hal.science/insu-03596388/file/ggv476.pdf BIBCODE: 2016GeoJI.204.736C doi:10.1093/gji/ggv476 |
op_rights |
http://creativecommons.org/licenses/by/ info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1093/gji/ggv476 |
container_title |
Geophysical Journal International |
container_volume |
204 |
container_issue |
2 |
container_start_page |
736 |
op_container_end_page |
747 |
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1776205103293792256 |