High temporal resolution monitoring of small variations in crustal strain by dense seismic arrays

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http://hdl.handle.net/10138/302162

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Mao , S , Campillo , M , Hilst , R D , Brenguier , F , Stehly , L & Hillers , G 2019 , ' High temporal resolution monitoring of small variations in crustal strain by dense seismic arrays ' , Geophysical Research Letters , vol. 46 , no. 1 , pp. 128-137 . https://doi.org/10.1029/2018GL079944

Title: High temporal resolution monitoring of small variations in crustal strain by dense seismic arrays
Author: Mao, Shujuan; Campillo, Michel; Hilst, Robert D.; Brenguier, Florent; Stehly, Laurent; Hillers, Gregor
Contributor: University of Helsinki, Department of Geosciences and Geography
Date: 2019-01
Language: eng
Belongs to series: Geophysical Research Letters
ISSN: 0094-8276
URI: http://hdl.handle.net/10138/302162
Abstract: Abstract 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 sub-daily 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 one hour. 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.
Subject: 1171 Geosciences
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