地震学报（英文版）2007，Vol.20Issue(6)：605-616,12.
An inversion of site response and Lg attenuation using Lg waveform
An inversion of site response and Lg attenuation using Lg waveform
摘要
Abstract
Based on spectral ratio method, a joint inversion method was used to obtain parameters of Lg wave attenuation and site response. The inversion method allows simple and direct (two-parameter) determination of Lg wave attenuation and site response from sparse spectral data, which are not affected by radiation pattern factor and different response of same instrument after geometrical spreading. The method was used successfully for estimating site response of stations of Zhejiang Seismic Network and measuring Lg wave attenuation. The study is based on 20 earthquakes occurred in northeast of Taiwan with magnitude Ms5.0～6.7 and 960 seismic wave records from 16 stations in Zhejiang area from 2002 to 2005. The parameters of site response and Lg attenuation were calculated with a frequency interval of 0.2 Hz in the range of 0.5 Hz to 10 Hz. Lg wave attenuation coefficient corresponding to U-D,E-W and N-S components are γ(f)=0.00175f0.43485, γ(f)=0.00145f0.48467 and γ(f)=0.0021f0.41241, respectively.It is found that the site response is component-independent. It is also found that the site response of QIY station is significant above the frequency of 1.5 Hz, and that the site response of NIB station is low for most frequency关键词
Lg wave/ site response/ parameters of attenuation/ joint inversionKey words
Lg wave/ site response/ parameters of attenuation/ joint inversion分类
天文与地球科学引用本文复制引用
ZHU Xin-yun,CHEN Yun-tai..An inversion of site response and Lg attenuation using Lg waveform[J].地震学报（英文版）,2007,20(6):605-616,12.基金项目
Zhejiang Province Science and Technology Plan (2007C33060) and National Science and Technology Support Plan (2006BAC01B03-04-02). （2007C33060）
