邢台震源区波速比异常与地震的关系  

V_p/V_s ANOMALY AND EARTHQUAKE IN XINGTAI EPICENTRAL REGION

作　　者：嘉世旭[1] 刘昌铨[1] 

机构地区：[1]国家地震局地球物理勘探中心

出　　处：《地球物理学报》1996年第S1期205-215,共11页Chinese Journal of Geophysics

基　　金：地震科学联合基金

摘　　要：通过对忻州─泰安人工地震测深剖面Ｐ波、Ｓ波的联合解释，得到沿剖面不同地质单元隆起区与裂陷区、震源区与非震区的速度和波速比结构．鲁西隆起和太行、山西隆起为较均匀的成层构造，地壳厚度分别为３２ｋｍ和４０－４３ｋｍ，波速比为１．７４．中段裂陷区构造变化较大，地壳厚度约３０－３３ｋｍ，波速比为１．７５－１．７７．邢台地震区上地壳下部和中地壳出现高波速比１．７７的异常，与裂陷区东的１．７３形成明显的差异．由此推测，地震的发生不仅与震源区的构造有关，更主要是与震源区岩石的性质有关。By studing, interpreting the Information of P-wave and S-wave of Taian-Longyaon-Xingzhou DSS Profile. We get the velocity and Vp/Vs ratio structure in different geologic units,upheaval and depression,earthquake and nonearthquake region.western shandeng upheaval and Taihang,Shanxi upheaval are more homogeneous layering structure, the crustal thickness are 32 km and 40-43 km,the Vp/Vs ratio is 1. 74.The structural anisotropy are greater in North China depression region, the crustal thickness are 30-33 km, the Vp/Vs ratio are1.75-1.77. There are Vp/Vs(1.77) anomaly in lower of Upper CruSt and middle crust of Xingtai earthquake region, it appear the obvious difference of the Vp/ Vs ratio(1.73)in the East of North China depression. The result indicate that preparation and occurrence earthquake relate with not only the structure but also the rock characteristic in hypocertral region.

关 键 词：地震测深 波速比 震源岩性 邢台震源区 

分 类 号：P315[天文地球—地震学]