利用远震接收函数反演重庆地震台下方的速度结构  

Velocity structure inversion beneath Chongqing Seismic Station using teleseismic receiver function

作　　者：郭欣 王小龙 勾宪斌 余国政 

机构地区：[1]重庆市地震局,中国重庆401147

出　　处：《地震地磁观测与研究》2013年第5期13-18,共6页Seismological and Geomagnetic Observation and Research

基　　金：重庆市地震局科研课题资助

摘　　要：选取重庆地震台2010年至2012年记录的60个远震宽频带数字地震记录,采用频率域反褶积法获得台站的接收函数,采用H-Kappa叠加方法反演台站下方的地壳厚度和泊松比,作为台站下方波速反演的约束条件,以减少反演的非唯一性。计算结果显示,重庆地震台下方地壳厚度为42 km,与中国大陆中西部地区Moho面深度在38—45 km保持一致。该研究对增强该区的深部地质构造特征、分析孕震机制等具有积极意义。On basis of 60 teleseismic broadband digital seismic records from 2010 to 2012 recorded by Chongqing Seismic Station,frequency deconvolution method is used to calculate receiver functions and H-Kappa stacking method is adopted to inverse the thickness and Poisson ratio in crust of this area.Then the crustal thickness inversed by H-Kappa stacking method is used as a constraint for velocity inversion beneath the seismic network in order to reduce inversion non-uniqueness.The result shows that the crustal thickness beneath Chongqing Seismic Station is about 42 km.This is consistent with the Moho depth （between 38 km and 45 km） in the central and western regions in China.It has a positive meaning for enhancing this area＇s characteristics of deep geological structure,earthquake nucleate analysis,and so on.

关 键 词：接收函数 地震反演 HK法 速度结构 

分 类 号：P315[天文地球—地震学]