摘要
利用三峡台网及其周边10个台站2001～2006年的17243条P波初至记录,研究了三峡地区的P波速度结构。结果表明:三峡地区P波速度横向差异明显,浅层的速度变化与地表构造关系密切;从上到下的速度等值线走向变化体现了该地区的构造应力场演化历史;1979年秭归5.1级地震发生在介质速度剧烈变化的部位,位于高速体与低速体之间。
The P wave velocity structure is studied on the basis of the 17 324 P wave arrive data recorded by the Three Gorges seismic telemetry network and other ten stations around it from 2001 to 2006. The result of the tomography indicates that the lateral inhomogeneity of the P wave velocity structure in the region is significant. The distribution of the velocity in shallow layer is closely related to the geological tectonic of the surface. The change of the P wave velocity from upper crust to lower crust is consistent with the evolution history of the tectonic stress filed. The Zigni MS. 1 earthquake occured in sharp gradient zones of velocity and located between the zones of low velocity and high velocity zone.
出处
《大地测量与地球动力学》
CSCD
北大核心
2007年第3期80-84,共5页
Journal of Geodesy and Geodynamics
基金
中国科技部社会公益研究专项(2004DIB3J131)
长江三峡工程开发总公司专项(CT-06-07-03)
关键词
层析成像
三峡地区
P波速度
横向不均匀性
应力场
tomography, the Three Gorges region, P wave velocity,lateral inhomogeneity, stress field
作者简介
廖武林：男,1976年生,博士研究生,目前主要从事地震波各向异性研究.E-mail：lwldy@163.com
