Abstract: Amplification factors for two soil types and 23 periods were obtained using accelerographic records and their correlation with seismic parameters and soil condition for Costa Rica. The factors were obtained from regressions analysis between PSA for 5% damping as the dependent variable and three independent variables: magnitude. hypocentral distance, and soil type at each site, defined as S II (hard to medium soil) and S III (soft soil). It was assumed that the condition S I (rock) did not amplify. Factors obtained for S II show an almost constant value throughout the range of periods for the three different considered data sets (subduction. crustal or crustal + subduction combined) and compared with amplifications obtained by other authors, especially for Japan. For S III, amplification factors obtained in this investigation for the entire data set (subduction + crustal origin) are clearly higher mainly above period of 0.4 s.
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Author:
Víctor Schmidt