中国东部及其相邻海域S波三维速度结构  

THE 3-D SHEAR WAVE VELOCITY STRUCTURE BENEATH THE EASTERN CHINA AND ITS ADJACENT SEAS

作　　者：宋仲和[1] 陈国英[1] 安昌强 陈立华[1] 庄真[2] 傅竹武[2] 吕梓龄[2] 胡家富[2] 

机构地区：[1]国家地震局地球物理研究所,北京100081 [2]云南大学地球物理系,昆明650091

出　　处：《地球物理学报》1992年第3期316-330,共15页Chinese Journal of Geophysics

基　　金：国家自然科学基金

摘　　要：本文选用了中国27个基准台763长周期地震仪和WWSSN 3个地震台长周期地震仪记录的238条瑞利波路径资料,用适配滤波频时分析和改进的网格反演方法,研究了中国及邻海170km深度范围内S波三维速度结构.本文只给出中国东部及邻海的研究结果. 结果表明,该研究区内直到170km深度范围内的速度结构,具有以40°—44°N,28°—32°N和20°N左右为界南北分块以及大体沿岛弧走向呈条带状的特征.这些特征与大地构造单元的划分有明显的关系.同时发现布格重力异常基本上受莫霍面的控制,地表热流值与上地幔低速层的埋深也有明显的相关性.In this paper, 238 long period Rayleigh wave records from 30 seismic stations and 75 earthquakes are selected. Matched-Filtering and improved Grid Dispersion Inversion are performed on these data to give the pure-path dispersion curves of group velocities in the periods from 10 to 113 secends. Finally, the 3-D velocity model to a depth of 170km is given, In this paper, only the results obtained in the eastern China and its margin seas are shown.The shear wave velocity structure reveals following characters: there appears the division of researched region into blocks in south-north directions with the latitudes about 40°-44°N, 28°-32°N, 2°N as thier boundaries and shows the beltform distribution along the strike of island arc. The different characters of velocity structure in crust and upper mantle closely relate to the division of the first and second order tectonic elements. In addition, it is found that the Bouguer gravity anomaly is mainly under the control of the distribution of Moho depth and the depth of low velocity layer in upper mantle has clear concerned with surface heat flow values.

关 键 词：地震 S波 三维 速度结构 邻海 中国 

分 类 号：P315.3[天文地球—地震学]