用广义反演方法估算首都圈地区台站场地效应  

Site Effects Estimation for the Stations of the Capital Region,China Using Generalized Inversion Method

作　　者：史海霞[1] 修济刚[2] 陈章立[2] 王勤彩[1] 华卫[1] 

机构地区：[1]中国地震局地震预测研究所,北京100036 [2]中国地震局,北京100036

出　　处：《地震》2009年第2期1-11,共11页Earthquake

基　　金：中国地震局行业基金专项(20078-26)资助

摘　　要：本文利用2001--2006年首都圈地区的SH波数字化地震资料，用广义逆矩阵联合反演的方法得到了63个台站的场地效应值。基岩场地的场地效应比较稳定，在1～10Hz范围内为1左右；沉积场地在低频场地效应较高，在1～8Hz范围内在3～7之间，5Hz左右场地效应有明显的突起，以后随频率增加降低。结果表明，台站岩性是影响场地效应形态和大小的主要因素，此外其场地效应还可能与所处的局部地质构造等因素有关。Generalized inversion method has been used to estimate the spatial variation of site effects, using the digital data of SH-Waves recorded by 63 stations from 2001 to 2006 in the Capital region of China. It has been found that the site effects of base rock are stable and about 1.0 in the frequency range of 1.0 Hz to 10.0 Hz; while the site effects of depos- it are high in the low frequency, about 3-7 from 1.0 Hz to 8.0 Hz and the site effect was protuberant at about 5.0 Hz, then fall as the frequency increases. These results show that the shape and intensity of station site effects are mainly influenced by the lithology below the station and also influenced by local geological conformation.

关 键 词：首都圈 场地效应 广义逆反演法 SH波 

分 类 号：P315.7[天文地球—地震学]