云南永胜期纳盆地的场地放大  

Site Amplification of Qina Basin in Yongsheng, Yunnan

作　　者：李白基[1] 秦嘉政[1] 叶建庆[1] 钱晓东[1] 

机构地区：[1]云南省地震局,昆明650041

出　　处：《地震研究》2005年第2期157-161,共5页Journal of Seismological Research

基　　金：云南省"十五"科技攻关项目"云南强震中短期预测技术研究"(2001NG46)资助.

摘　　要：根据2001年云南永胜MS6.0地震的57个余震的304条数字地震记录,用线性反演法得出了期纳盆地相对于三道河台频率1.5～20Hz的S波场地放大。有实际放大作用的频率在10Hz以下,期纳台、半屏台和黄泥田台的放大峰值在4.5Hz处,糖厂台和龙门村台的放大峰值在7.5Hz处。所有台的峰值都约为三道河台的两倍。用永胜(基岩)区域数字地震台的记录作参考核算,10Hz以下,三道河台的场地放大约为1,其余台约为2,所以三道河台可作为基岩台看待。Taking the Sandaohe station as a standard station, we calculated the relative site amplification of Qina Basin at 1.5-20.0 Hz with linear inversion method on the basis of the 304S-wave spectra values from 57 aftershocks of the 2001 Yongsheng, Yunnan, M S 6.0 earthquake. The result indicates that the effective amplification frequency is less than 10Hz. The site amplification peak value is at 4.5Hz at the Qina, Banping, and Huangnitian stations, but at 7.5Hz at the Suger Finery station and Longmen Village station. All the peak values are about two times as big as that at the Sandaohe station. In addition, if we take the Yongsheng station (bedrock station) as a reference, below 10Hz, the site amplification is about 1 at the Sandaohe station, about 2 at other stations. This demenstrates it is reasonable taking the Sandaohe station as bedrock station (standard station).

关 键 词：场地放大 数字地震记录 S波 线性反演 云南永胜 

分 类 号：P315.31[天文地球—地震学]