CIGEOBIO   24054
CENTRO DE INVESTIGACIONES DE LA GEOSFERA Y BIOSFERA
Unidad Ejecutora - UE
artículos
Título:
Evidence of site amplification from ground motion of the last two large crustal earthquakes in central-western Argentina
Autor/es:
CHRISTIANSEN, R.; GREGORI, D.; ALVARADO, P.; SAEZ, M.
Revista:
NATURAL HAZARDS (DORDRECHT)
Editorial:
SPRINGER
Referencias:
Año: 2020 vol. 102 p. 1011 - 1031
ISSN:
0921-030X
Resumen:
The present study has investigated site amplifcation efects from the analysis of peakground accelerations (PGA) and spectral accelerations (SA) of the last two major crustalearthquakes in central-western Argentina. These data were obtained from 15 accelerometers and 57 seismoscopes, which recorded ground motions during the 1977 (Mw 7.5) SanJuan earthquake, and the 1985 (Mw 5.9) Mendoza earthquake. PGA and SA measurementswere compared with average values predicted by global attenuation empirical relationshipsfor the same type of crustal earthquakes. The amplifcations in ground accelerations wereanalyzed according to their distribution and compared with the average shear wave velocities at 30 m depth (Vs30) where the stations are located. Our results defnitively show thatsite efects and direction of maximum surface wave radiation strongly amplify the groundacceleration during moderate to large earthquakes near San Juan and Mendoza (Argentina); this is of importance in seismic hazard analyses.