Evaluation of local site effects in Lima City, Peru from ground motion data

The present study aims to examine thoroughly the relation between the local site effects and the local subsurface conditions in Lima city, due to the fact that there is little information related to the seismic amplification in this city. Using ground motion records, the amplification effects are studied empirically, in the frequency range from 0.1 to 20 Hz. This study analyzes the seismic events observed along the Pacific coast of Lima city, which were recorded by 10 stations. Because of the limitation in data, site amplification factors are evaluated by using three different methods: the standard spectral ratio, the spectral inversion method and the H/V ratio, so as to identify the significant peaks and troughs at all sites. Results show that most of the stations present relatively large amplifications in the high-frequency range over 3 Hz, moreover RIN station. Nonetheless, CAL site has a different behavior of amplification.

Author: Selene Quispe, Zenon Aguilar, Fernando Lazares, Hernando Tavera, Hiroaki Yamanaka, and Fumio Yamazaki.

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