利用不同方法估算流动台站的场地响应

Abstract

Abstract: Site response characteristics in Dayao area were analyzed using various methods such as ground-motion-inversion method (Moya′s method) and horizontal-to-vertical-spectral ratio (Nakamura′s method) and reference-site method, using the records of earthquake sequences of the 21 July 2003 Dayao (M6.2), Yunnan province. Our results show that ① Site response results by Moya′s method indicate that the site amplifications in the Dayao area are apparent, between 3 and 20 times, up to 40 times at the most. The dominant frequency is between 3 and 6 Hz, but the site responses decay very fast at the high frequency (≥10 Hz). There are some differences among the site responses for the stations with different rock base. Site responses appear more flat for the stations with efflorescent conglomerate base and their values are smaller than other stations with soil base. ② Site responses by Nakamura′s method with the angle of incidence bigger or smaller than 40°appear to be different, but with no obvious dependence on the angle of incidence in its own ranges. ③ Site responses by these three methods with the seismic data recorded by the same station in different times appear to have good stability. Site responses by Moya′s method are bigger than that of Nakamura′s method at the frequency <10 Hz due to the existing of amplification in the vertical component, but their forms are coherent. ④ Moya′s method is a source-dependent approach to estimate absolute site effects and the other two methods are reference-dependent approaches to obtain relative site effects and are deeply affected by the reference site.

Key words: Site response, Dayao earthquake sequence, Temporary station

CLC Number:

P315

HUA Wei, CHEN Zhang-li, ZHENG Si-hua. Estimation of Site Responses for Temporary Stations Using Various Methods[J]. EARTHQUAKE, 2010, 30(3): 30-44.

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Estimation of Site Responses for Temporary Stations Using Various Methods

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