High Temporal Resolution Monitoring of Small Variations in Crustal Strain by Dense Seismic Arrays - Université Grenoble Alpes Accéder directement au contenu
Article Dans Une Revue Geophysical Research Letters Année : 2019

High Temporal Resolution Monitoring of Small Variations in Crustal Strain by Dense Seismic Arrays

Résumé

We demonstrate the feasibility of detecting very weak deformation in the shallow crust with high temporal resolution by monitoring the relative changes in seismic wave velocity (dv/v) using dense arrays of seismometers. We show that the dv/v variations are consistent between independent measurements from two seismic arrays. Dominant peaks in the observed dv/v spectrum suggest that tides and temperature changes are the major causes of daily and subdaily velocity changes, in accordance with theoretical strain modeling. Our analysis illustrates that dv/v perturbations of the order of 10−4, corresponding to crustal strain changes of the order of 10−8, can be measured from ambient seismic noise with a temporal resolution of 1 hr. This represents a low‐cost technique for high precision and high time‐resolution monitoring of crustal deformation that is complementary to existing geodetic measurements and is instrumental in both the detection and understanding of low‐amplitude precursory processes of natural catastrophic events.
Fichier principal
Vignette du fichier
4. Geophysical Research Letters | Mao_2019.pdf (1.26 Mo) Télécharger le fichier
Origine Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02927992 , version 1 (02-09-2020)

Identifiants

Citer

Shujuan Mao, Michel Campillo, Robert D van Der Hilst, Florent Brenguier, Laurent Stehly, et al.. High Temporal Resolution Monitoring of Small Variations in Crustal Strain by Dense Seismic Arrays. Geophysical Research Letters, 2019, 46 (1), pp.128-137. ⟨10.1029/2018GL079944⟩. ⟨hal-02927992⟩
79 Consultations
135 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More