Cargando…

Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes

Although moderate‐size earthquakes are poorly studied by lack of near‐fault observations, they can provide key information about larger damaging earthquakes. Here we propose a new approach, inspired by double‐difference relocation, that uses high‐coherency waveforms recorded at neighboring sensors,...

Descripción completa

Detalles Bibliográficos
Autores principales: Mordret, A., Brenguier, F., Causse, M., Boué, P., Voisin, C., Dumont, I., Vernon, F. L., Ampuero, J. P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7583370/
https://www.ncbi.nlm.nih.gov/pubmed/33132459
http://dx.doi.org/10.1029/2020GL088563
_version_ 1783599382431531008
author Mordret, A.
Brenguier, F.
Causse, M.
Boué, P.
Voisin, C.
Dumont, I.
Vernon, F. L.
Ampuero, J. P.
author_facet Mordret, A.
Brenguier, F.
Causse, M.
Boué, P.
Voisin, C.
Dumont, I.
Vernon, F. L.
Ampuero, J. P.
author_sort Mordret, A.
collection PubMed
description Although moderate‐size earthquakes are poorly studied by lack of near‐fault observations, they can provide key information about larger damaging earthquakes. Here we propose a new approach, inspired by double‐difference relocation, that uses high‐coherency waveforms recorded at neighboring sensors, to study the preparation phase and dynamics of moderate‐size earthquakes. We validate this technique by analyzing the 2016, M(w)5.2 Borrego Springs earthquake in Southern California and find consistent rupture velocities of 2 km/s highlighting two main rupture asperities. The analysis of the 2019, Ml5.2 Le Teil earthquake in France reveals slow nucleation at depth that migrates to the surface and propagates northward with a velocity of ∼2.8 km/s, highlighting two main rupture events also imaged by InSAR. By providing unprecedented resolution in our observation of the rupture dynamics, this approach will be useful in better understanding the preparation phase and rupture of both tectonic and induced earthquakes.
format Online
Article
Text
id pubmed-7583370
institution National Center for Biotechnology Information
language English
publishDate 2020
publisher John Wiley and Sons Inc.
record_format MEDLINE/PubMed
spelling pubmed-75833702020-10-29 Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes Mordret, A. Brenguier, F. Causse, M. Boué, P. Voisin, C. Dumont, I. Vernon, F. L. Ampuero, J. P. Geophys Res Lett Research Letters Although moderate‐size earthquakes are poorly studied by lack of near‐fault observations, they can provide key information about larger damaging earthquakes. Here we propose a new approach, inspired by double‐difference relocation, that uses high‐coherency waveforms recorded at neighboring sensors, to study the preparation phase and dynamics of moderate‐size earthquakes. We validate this technique by analyzing the 2016, M(w)5.2 Borrego Springs earthquake in Southern California and find consistent rupture velocities of 2 km/s highlighting two main rupture asperities. The analysis of the 2019, Ml5.2 Le Teil earthquake in France reveals slow nucleation at depth that migrates to the surface and propagates northward with a velocity of ∼2.8 km/s, highlighting two main rupture events also imaged by InSAR. By providing unprecedented resolution in our observation of the rupture dynamics, this approach will be useful in better understanding the preparation phase and rupture of both tectonic and induced earthquakes. John Wiley and Sons Inc. 2020-09-02 2020-09-16 /pmc/articles/PMC7583370/ /pubmed/33132459 http://dx.doi.org/10.1029/2020GL088563 Text en ©2020. The Authors. This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Research Letters
Mordret, A.
Brenguier, F.
Causse, M.
Boué, P.
Voisin, C.
Dumont, I.
Vernon, F. L.
Ampuero, J. P.
Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes
title Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes
title_full Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes
title_fullStr Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes
title_full_unstemmed Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes
title_short Seismic Stereometry Reveals Preparatory Behavior and Source Kinematics of Intermediate‐Size Earthquakes
title_sort seismic stereometry reveals preparatory behavior and source kinematics of intermediate‐size earthquakes
topic Research Letters
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7583370/
https://www.ncbi.nlm.nih.gov/pubmed/33132459
http://dx.doi.org/10.1029/2020GL088563
work_keys_str_mv AT mordreta seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes
AT brenguierf seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes
AT caussem seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes
AT bouep seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes
AT voisinc seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes
AT dumonti seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes
AT vernonfl seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes
AT ampuerojp seismicstereometryrevealspreparatorybehaviorandsourcekinematicsofintermediatesizeearthquakes