利用H/V谱比法研究长江中下游地区沉积层厚度  

Sedimentary thickness of the middle and lower Yangtze River region obtained from H/V spectral ratio

作　　者：孙晓倩 李信富[1] SUN XiaoQian;LI XinFu(School of Geophysics and Information Technology,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区：[1]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《地球物理学进展》2022年第6期2301-2307,共7页Progress in Geophysics

基　　金：国家自然科学基金面上项目“长江中下游成矿带东北段盆岭地区壳幔结构与各向异性特征重构”(41474045)资助。

摘　　要：利用地脉动数据可以确定地震动对地表介质产生的响应,传统的H/V谱比法是针对于地脉动数据而发展起来的,本文将H/V谱比法应用于处理宽频带地震数据.本研究以长江中下游地区为研究对象,对68个宽频地震台站采集到的数据去除地震波形事件后的时间序列进行H/V谱比处理,得到了长江中下游不同区域的沉积厚度.河淮盆地的沉积层厚度大于3000 m.铜陵与安庆,庐棕三个矿区及其附近邻区其卓越频率位于0.05~0.1 Hz,沉积厚度3000 m左右,由西向东逐渐减薄为2000 m左右,且矿区沉积层横向变化大.江汉盆地的沉积层较厚,其边缘沉积层厚度可达3000 m.The response of ground motion to surface medium can be determined by using the data of ground motion.The traditional H/V spectral ratio method is developed for the data of ground pulsation.In this paper,the H/V spectral ratio method is applied to broadband seismic data.This study takes the middle and lower Yangtze River region as the research area,the H/V spectral ratio method is used to process the time series after the removal of seismic waveform from the data collected by 68 broadband seismic stations.The sedimentary thickness of different areas in the middle and lower Yangtze River region is obtained.The thickness of sedimentary layer in Hehuai basin is more than 3000 m.Tongling,Anqing and Luzhou mining areas and their adjacent areas have a dominant frequency of 0.05~0.1 Hz.The sedimentary thickness is about 3000 m,which is gradually thinned to about 2000 m from west to East,and the lateral variation of sedimentary layer in the mining area is large.The sedimentary layer of Jianghan Basin is relatively thick,and the thickness of its marginal sedimentary layer can reach 3000 m.

关 键 词：H/V谱比 宽频地震数据 长江中下游地区 沉积层厚度 

分 类 号：P315[天文地球—地震学]