摘要
通过对两条测深剖面资料的处理计算和综合研究后发现 ,研究区壳幔结构具有明显的分层性 ,不同的地质构造块体在速度结构、构造特征上显示出较大差异。上、下地壳的分界C界面和M界面是具有较大起伏变化的界面 ,由伽师下方最浅的 30 0km(C界面 )、4 5 5km(M界面 )向西昆仑山区急剧加深至 4 4 0km和 70 0km ;塔里木块体较高的速度结构意味着地壳结构相对“稳定”的特性 ;根据伽师地区震源深度大多分布在 2 0～ 4 0km这一现象 ,可以认为 ,C、M界面的局部隆起。
By means of calculation and synthetic study, two profiles records have been used. The result shows as follows: there are conspicuous layers of the crust mantle structure in the studied area. The diversity is obvious on velocity structure and tectonic feature between different tectonic bodies. The C and M interfaces, which are discontinuities between upper and low crust, have evidence fluctuation. The depth from 30 0km(C interface), 45 5km(M interface) beneath the Jiashi area increase sharply to 44 0km(C interface) and 70km(M interface) beneath the west of the Kunlun Mountains. The high velocity structure of the Tarim tectonics body means the relative stable of the crust structure there. That the seismic focus of Jiashi area distributes at depth of 20～40km concludes the existence of the local uplift of C and M interface, the low velocity abnormal bodies and the deep great faults has some controlling effect on the breeding and occurrence of Jiashi meizoseismal area.
出处
《中国地震》
CSCD
北大核心
2002年第4期317-325,共9页
Earthquake Research in China
基金
国家重点基础研究发展规划项目<大陆强震机理与预测>(G19980 40 70 2 )
国家科技部
中国地震局联合主持的国家重点科技攻关计划课题(96913 0 7)共同资助项目
