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Detection of ground motions using high-rate GPS time-series

Psimoulis, Panos; Houlié, Nicolas; Habboub, Mohammed; Michel, Clotaire; Rothacher, Markus

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Authors

Nicolas Houlié

Mohammed Habboub

Clotaire Michel

Markus Rothacher



Abstract

Monitoring surface deformation in real-time help at planning and protecting infrastructures and populations, manage sensitive production (i.e. SEVESO-type) and mitigate long-term consequences of modifications implemented. We present RT-SHAKE, an algorithm developed to detect ground motions associated with landslides, sub-surface collapses, subsidences, earthquakes or rock falls. RT-SHAKE detects first transient changes in individual GPS time series before investigating for spatial correlation(s) of observations made at neighbouring GPS sites and eventually issue a motion warning. In order to assess our algorithm on fast (seconds to minute), large (from 1cm to meters) and spatially consistent surface motions, we use the 1Hz GEONET GNSS network data of the Tohoku-Oki MW9.0 2011 as a test scenario. We show the delay of detection of seismic wave arrival by GPS records is of ~10 seconds with respect to an identical analysis based on strong-motion data and this time delay depends on the level of the time-variable noise. Nevertheless, based on the analysis of the GPS network noise level and ground motion stochastic model, we show that RT-SHAKE can narrow the range of earthquake magnitude, by setting a lower threshold of detected earthquakes to MW6.5-7, if associated with a real-time automatic earthquake location system.

Journal Article Type Article
Acceptance Date May 17, 2018
Online Publication Date May 18, 2018
Publication Date 2018-08
Deposit Date May 30, 2018
Publicly Available Date May 30, 2018
Journal Geophysical Journal International
Print ISSN 0956-540X
Electronic ISSN 1365-246X
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 214
Issue 2
Pages 1237–1251
DOI https://doi.org/10.1093/gji/ggy198
Keywords Earthquake Early Warning, GPS, detection, seismic signal, 2011 Tohoku-Oki, RT-SHAKE
Public URL https://nottingham-repository.worktribe.com/output/932953
Publisher URL https://academic.oup.com/gji/advance-article/doi/10.1093/gji/ggy198/4999902
Additional Information This article has been accepted for publication in Geophysical Journal International ©:2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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