Arrêt de service lundi 11 juillet de 12h30 à 13h : tous les sites du CCSD (HAL, EpiSciences, SciencesConf, AureHAL) seront inaccessibles (branchement réseau à modifier)
Accéder directement au contenu Accéder directement à la navigation
Article dans une revue

Depth Constraints on Coseismic Velocity Changes From Frequency Dependent Measurements of Repeating Earthquake Waveforms

Abstract : We revisit velocity changes caused by the 2004 Parkfield earthquake through the analysis of the coda of repeating earthquakes. Our results reveal the change to be strongly frequency dependent. Low frequency components of the coda of repeating earthquakes are more affected by the velocity alteration than high frequency components. We interpret this to indicate that the coseismic velocity reduction primarily occurs at a shallow depth, and is expressed in low frequency energy resulting from reverberations near the Earth's surface. This can only be observed at low frequencies because the shallow crust is highly dissipative. The high frequency component is relatively unaffected, as it is comprised of body waves scattered throughout the crust. We support this argument with direct observations of seismic wavefields across a wide range of depths in the shallow crust, supplemented by using downhole geophones and distributed acoustic sensing measurements.
Type de document :
Article dans une revue
Liste complète des métadonnées

https://hal-insu.archives-ouvertes.fr/insu-03594415
Contributeur : Nathalie POTHIER Connectez-vous pour contacter le contributeur
Soumis le : jeudi 23 juin 2022 - 10:33:10
Dernière modification le : vendredi 24 juin 2022 - 03:05:02

Fichier

JGR Solid Earth - 2021 - Sheng...
Fichiers éditeurs autorisés sur une archive ouverte

Licence

Copyright (Tous droits réservés)

Identifiants

Collections

Citation

yixiao Sheng, William L. Ellsworth, Ariel Lellouch, Gregory C. Beroza. Depth Constraints on Coseismic Velocity Changes From Frequency Dependent Measurements of Repeating Earthquake Waveforms. Journal of Geophysical Research: Solid Earth, 2021, 126, pp.1053-1064. ⟨10.1029/2020JB020421⟩. ⟨insu-03594415⟩

Partager

Métriques

Consultations de la notice

0

Téléchargements de fichiers

0