Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves
Seismic coda measurements retrieve parameters linked to the physical characteristics of rock volumes illuminated by high frequency scattered waves. Space weighting functions (SWF) and kernels are different tools that model the spatial sensitivity of coda envelopes to scattering and absorption anomal...
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Online Access: | http://hdl.handle.net/2122/11966 https://doi.org/10.3390/geosciences8050175 |
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ftingv:oai:www.earth-prints.org:2122/11966 2023-05-15T14:01:37+02:00 Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves Del Pezzo, Edoardo De la Torre, Angel Bianco, Francesca Ibanez, Jesús Gabrielli, Simona De Siena, Luca Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia #PLACEHOLDER_PARENT_METADATA_VALUE# 2018 http://hdl.handle.net/2122/11966 https://doi.org/10.3390/geosciences8050175 en eng Geosciences /8 (2018) http://hdl.handle.net/2122/11966 doi:10.3390/geosciences8050175 open Coda waves Seismic imaging 3D Kernel functions for scattered waves article 2018 ftingv https://doi.org/10.3390/geosciences8050175 2022-07-29T06:07:36Z Seismic coda measurements retrieve parameters linked to the physical characteristics of rock volumes illuminated by high frequency scattered waves. Space weighting functions (SWF) and kernels are different tools that model the spatial sensitivity of coda envelopes to scattering and absorption anomalies in these rock matrices, allowing coda-wave attenuation (Qcoda) imaging. This note clarifies the difference between SWF and sensitivity kernels developed for coda wave imaging. It extends the SWF previously developed in 2D to the third dimension by using radiative transfer and the diffusion equation, based on the assumption that variations of Qcoda depend solely on variations of the extinction length. When applied to active data (Deception Island, Antarctica), 3D SWF images strongly resemble 2D images, making this 3D extension redundant. On the other hand, diffusion does not efficiently model coda waveforms when using earthquake datasets spanning depths between 0 and 20 km, such as at Mount St. Helens volcano. In this setting, scattering attenuation and absorption suffer tradeoffs and cannot be separated by fitting a single seismogram energy envelope for SWF imaging. We propose that an approximate analytical 3D SWF, similar in shape to the common coda kernels used in literature, can still be used in a space weighted back-projection approach. While Qcoda is not a physical parameter of the propagation medium, its spatially-dependent modeling allows improved reconstruction of crustal-scale tectonic and geological features. It is even more efficient as a velocity independent imaging tool for magma and fluid storage when applied to deep volcanism Published id 175 5T. Sismologia, geofisica e geologia per l'ingegneria sismica JCR Journal Article in Journal/Newspaper Antarc* Antarctica Deception Island Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) Deception Island ENVELOPE(-60.633,-60.633,-62.950,-62.950) Geosciences 8 5 175 |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
Coda waves Seismic imaging 3D Kernel functions for scattered waves |
spellingShingle |
Coda waves Seismic imaging 3D Kernel functions for scattered waves Del Pezzo, Edoardo De la Torre, Angel Bianco, Francesca Ibanez, Jesús Gabrielli, Simona De Siena, Luca Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
topic_facet |
Coda waves Seismic imaging 3D Kernel functions for scattered waves |
description |
Seismic coda measurements retrieve parameters linked to the physical characteristics of rock volumes illuminated by high frequency scattered waves. Space weighting functions (SWF) and kernels are different tools that model the spatial sensitivity of coda envelopes to scattering and absorption anomalies in these rock matrices, allowing coda-wave attenuation (Qcoda) imaging. This note clarifies the difference between SWF and sensitivity kernels developed for coda wave imaging. It extends the SWF previously developed in 2D to the third dimension by using radiative transfer and the diffusion equation, based on the assumption that variations of Qcoda depend solely on variations of the extinction length. When applied to active data (Deception Island, Antarctica), 3D SWF images strongly resemble 2D images, making this 3D extension redundant. On the other hand, diffusion does not efficiently model coda waveforms when using earthquake datasets spanning depths between 0 and 20 km, such as at Mount St. Helens volcano. In this setting, scattering attenuation and absorption suffer tradeoffs and cannot be separated by fitting a single seismogram energy envelope for SWF imaging. We propose that an approximate analytical 3D SWF, similar in shape to the common coda kernels used in literature, can still be used in a space weighted back-projection approach. While Qcoda is not a physical parameter of the propagation medium, its spatially-dependent modeling allows improved reconstruction of crustal-scale tectonic and geological features. It is even more efficient as a velocity independent imaging tool for magma and fluid storage when applied to deep volcanism Published id 175 5T. Sismologia, geofisica e geologia per l'ingegneria sismica JCR Journal |
author2 |
Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OV, Napoli, Italia #PLACEHOLDER_PARENT_METADATA_VALUE# |
format |
Article in Journal/Newspaper |
author |
Del Pezzo, Edoardo De la Torre, Angel Bianco, Francesca Ibanez, Jesús Gabrielli, Simona De Siena, Luca |
author_facet |
Del Pezzo, Edoardo De la Torre, Angel Bianco, Francesca Ibanez, Jesús Gabrielli, Simona De Siena, Luca |
author_sort |
Del Pezzo, Edoardo |
title |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_short |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_full |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_fullStr |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_full_unstemmed |
Numerically Calculated 3D Space-Weighting Functions to Image Crustal Volcanic Structures Using Diffuse Coda Waves |
title_sort |
numerically calculated 3d space-weighting functions to image crustal volcanic structures using diffuse coda waves |
publishDate |
2018 |
url |
http://hdl.handle.net/2122/11966 https://doi.org/10.3390/geosciences8050175 |
long_lat |
ENVELOPE(-60.633,-60.633,-62.950,-62.950) |
geographic |
Deception Island |
geographic_facet |
Deception Island |
genre |
Antarc* Antarctica Deception Island |
genre_facet |
Antarc* Antarctica Deception Island |
op_relation |
Geosciences /8 (2018) http://hdl.handle.net/2122/11966 doi:10.3390/geosciences8050175 |
op_rights |
open |
op_doi |
https://doi.org/10.3390/geosciences8050175 |
container_title |
Geosciences |
container_volume |
8 |
container_issue |
5 |
container_start_page |
175 |
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1766271570864504832 |