Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica
Multiple scattering of seismic waves is often seen as a nightmare for conventional migration techniques that generally rely on a ballistic or a single scattering assumption. In heterogeneous areas such as volcanoes, the multiple scattering contribution limits the imaging-depth to one scattering mean...
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ftdatacite:10.48550/arxiv.1901.00338 2023-05-15T13:59:09+02:00 Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica Blondel, Thibaud Chaput, Julien Derode, Arnaud Campillo, Michel Aubry, Alexandre 2019 https://dx.doi.org/10.48550/arxiv.1901.00338 https://arxiv.org/abs/1901.00338 unknown arXiv https://dx.doi.org/10.1029/2018jb016361 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Geophysics physics.geo-ph Data Analysis, Statistics and Probability physics.data-an FOS Physical sciences article-journal Article ScholarlyArticle Text 2019 ftdatacite https://doi.org/10.48550/arxiv.1901.00338 https://doi.org/10.1029/2018jb016361 2022-04-01T08:38:23Z Multiple scattering of seismic waves is often seen as a nightmare for conventional migration techniques that generally rely on a ballistic or a single scattering assumption. In heterogeneous areas such as volcanoes, the multiple scattering contribution limits the imaging-depth to one scattering mean free path, the mean distance between two successive scattering events for body waves. In this Letter, we propose a matrix approach of passive seismic imaging that pushes back this fundamental limit by making an efficient use of scattered body waves drowned into a noisy seismic coda. As a proof-of-concept, the case of the Erebus volcano in Antarctica is considered. The Green's functions between a set of geophones placed on top of the volcano are first retrieved by the cross-correlation of coda waves induced by multiple icequakes. This set of impulse responses forms a reflection matrix. By combining a matrix discrimination of singly-scattered waves with iterative time reversal, we are able to push back the multiple scattering limit beyond 10 scattering mean free paths. The matrix approach reveals the internal structure of the Erebus volcano: A chimney-shaped structure at shallow depths, a magma reservoir at 2500 m and several cavities at sea level and below it. The matrix approach paves the way towards a greatly improved monitoring of volcanic structures at depth. Beyond this specific case, the matrix approach of seismic imaging can generally be applied to all scales and areas where multiple scattering events undergone by body waves prevent in-depth imaging of the Earth's crust. : 14 pages, 7 figures Text Antarc* Antarctica DataCite Metadata Store (German National Library of Science and Technology) |
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Geophysics physics.geo-ph Data Analysis, Statistics and Probability physics.data-an FOS Physical sciences |
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Geophysics physics.geo-ph Data Analysis, Statistics and Probability physics.data-an FOS Physical sciences Blondel, Thibaud Chaput, Julien Derode, Arnaud Campillo, Michel Aubry, Alexandre Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica |
topic_facet |
Geophysics physics.geo-ph Data Analysis, Statistics and Probability physics.data-an FOS Physical sciences |
description |
Multiple scattering of seismic waves is often seen as a nightmare for conventional migration techniques that generally rely on a ballistic or a single scattering assumption. In heterogeneous areas such as volcanoes, the multiple scattering contribution limits the imaging-depth to one scattering mean free path, the mean distance between two successive scattering events for body waves. In this Letter, we propose a matrix approach of passive seismic imaging that pushes back this fundamental limit by making an efficient use of scattered body waves drowned into a noisy seismic coda. As a proof-of-concept, the case of the Erebus volcano in Antarctica is considered. The Green's functions between a set of geophones placed on top of the volcano are first retrieved by the cross-correlation of coda waves induced by multiple icequakes. This set of impulse responses forms a reflection matrix. By combining a matrix discrimination of singly-scattered waves with iterative time reversal, we are able to push back the multiple scattering limit beyond 10 scattering mean free paths. The matrix approach reveals the internal structure of the Erebus volcano: A chimney-shaped structure at shallow depths, a magma reservoir at 2500 m and several cavities at sea level and below it. The matrix approach paves the way towards a greatly improved monitoring of volcanic structures at depth. Beyond this specific case, the matrix approach of seismic imaging can generally be applied to all scales and areas where multiple scattering events undergone by body waves prevent in-depth imaging of the Earth's crust. : 14 pages, 7 figures |
format |
Text |
author |
Blondel, Thibaud Chaput, Julien Derode, Arnaud Campillo, Michel Aubry, Alexandre |
author_facet |
Blondel, Thibaud Chaput, Julien Derode, Arnaud Campillo, Michel Aubry, Alexandre |
author_sort |
Blondel, Thibaud |
title |
Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica |
title_short |
Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica |
title_full |
Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica |
title_fullStr |
Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica |
title_full_unstemmed |
Matrix Approach of Seismic Imaging: Application to the Erebus Volcano, Antarctica |
title_sort |
matrix approach of seismic imaging: application to the erebus volcano, antarctica |
publisher |
arXiv |
publishDate |
2019 |
url |
https://dx.doi.org/10.48550/arxiv.1901.00338 https://arxiv.org/abs/1901.00338 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_relation |
https://dx.doi.org/10.1029/2018jb016361 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1901.00338 https://doi.org/10.1029/2018jb016361 |
_version_ |
1766267599644000256 |