The scaling of PGA with IV2p and its potential for Earthquake Early Warning in Thessaly (Central Greece)

PDF FIG.1 FIG.4 FIG.5 FIG.6
Published: Sep 13, 2021
DOI: https://doi.org/10.12681/bgsg.27062
Keywords:
earthquake early warning system on-site Thessaly IV2p
Ioannis Spingos
Section of Geophysics–Geothermics, Department of Geology and Geoenvironment, National and Kapodistrian University of Athens Institute of Physics of the Earth’s Interior and Geohazards, UNESCO Chair on Solid Earth Physics and Geohazards Risk Reduction, Hellenic Mediterranean University Research Center
https://orcid.org/0000-0002-5850-5736
Filippos Vallianatos
Section of Geophysics–Geothermics, Department of Geology and Geoenvironment, National and Kapodistrian University of Athens Institute of Physics of the Earth’s Interior and Geohazards, UNESCO Chair on Solid Earth Physics and Geohazards Risk Reduction, Hellenic Mediterranean University Research Center
George Kaviris
Section of Geophysics–Geothermics, Department of Geology and Geoenvironment, National and Kapodistrian University of Athens Institute of Physics of the Earth’s Interior and Geohazards, UNESCO Chair on Solid Earth Physics and Geohazards Risk Reduction, Hellenic Mediterranean University Research Center
https://orcid.org/0000-0001-8956-4299
Abstract

The main goal of an Earthquake Early Warning System (EEWS) is to estimate the expected peak ground motion of the destructive S-waves using the first few seconds of P-waves, thus becoming an operational tool for real-time seismic risk management in a short timescale. EEWSs are based on the use of scaling relations between parameters measured on the initial portion of the seismic signal, after the arrival of the first wave. Herein, using the abundant seismicity that followed the 3 March 2021 Mw=6.3 earthquake in Thessaly we propose scaling relations for PGA, from data recorded by local permanent stations, as a function of the integral of the squared velocity (IV2p). The IV2p parameter was estimated directly from the first few seconds-long signal window (tw) after the P-wave arrival. Scaling laws are extrapolated for both individual and across sites (i.e., between a near-source reference instrument and a station located close to a target). The latter approach is newly investigated, as local site effects could have a significant impact on recorded data. Considering that further study on the behavior of IV2p is necessary, there are indications that this parameter could be used in future on-site single‐station earthquake early warning operations for areas affected by earthquakes located in Thessaly, as itpresents significant stability.

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  • Natural Hazards
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