H/V Microtremor Measurements in Pisco, Peru after the 2007 August 15 Earthquake

Abstract eng:
The 2007 August 15, Pisco, Peru earthquake caused a lot of damages to both adobe dwellings and substandard engineered buildings in Pisco. Liquefaction was wide spread in the city, with very large deformations observed in the areas closest to the ocean. Existing seismic wave amplification studies, based on soil classification, SPT and ground water levels, have identified 3 zones in Pisco, with amplification levels varying from 1.5 to more than 3. However, the distribution of MSK intensities, reported by Agüero et. al., differed somewhat from the above zonation. During our damage survey of Pisco we performed microtremor measurements at 34 points, collaborating with the Japan-Peruvian Centre of Seismic Investigations and Disaster Mitigation (CISMID). Our H/V evaluated frequencies are in fair agreement with the lithology and geotechnical characteristics and the frequencies distribution coincide partially the with MSK intensities. We hope our findings can complement the existing zonation and hazard maps.

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