Evidence of site amplification from ground motion of the last two large crustal earthquakes in central-western Argentina

Patricia Alvarado (), Rodolfo Christiansen (), Salvador Daniel Gregori and Mauro Saez
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Patricia Alvarado: Centro de Investigaciones de la Geósfera y Biósfera CIGEOBIO (CONICET-Universidad Nacional de San Juan UNSJ)
Rodolfo Christiansen: Universidad Nacional de San Juan
Salvador Daniel Gregori: Universidad Nacional de San Juan
Mauro Saez: Centro de Investigaciones de la Geósfera y Biósfera CIGEOBIO (CONICET-Universidad Nacional de San Juan UNSJ)

Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, 2020, vol. 102, issue 3, No 13, 1031 pages

Abstract: Abstract The present study has investigated site amplification effects from the analysis of peak ground accelerations (PGA) and spectral accelerations (SA) of the last two major crustal earthquakes in central-western Argentina. These data were obtained from 15 accelerometers and 57 seismoscopes, which recorded ground motions during the 1977 (Mw 7.5) San Juan earthquake, and the 1985 (Mw 5.9) Mendoza earthquake. PGA and SA measurements were compared with average values predicted by global attenuation empirical relationships for the same type of crustal earthquakes. The amplifications in ground accelerations were analyzed according to their distribution and compared with the average shear wave velocities at 30 m depth (Vs30) where the stations are located. Our results definitively show that site effects and direction of maximum surface wave radiation strongly amplify the ground acceleration during moderate to large earthquakes near San Juan and Mendoza (Argentina); this is of importance in seismic hazard analyses.

Keywords: Seismic hazard; Peak ground acceleration; Spectral acceleration; Surface wave radiation pattern (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1007/s11069-020-03943-8

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