摘要
通过计算机反复重演浅源大震分布图象,划分出五种发震主导方向:NW向、NNW向、SN向、NE向与NEE向。我国地震活动受三个不同层次的主导构造的制约:表层地壳块体活动边界断层的活动决定了地震的复发周期与震源机制,地块活动主要受到印度板块向北推挤的影响;深层是走向与形态相似的三大弧形构造:西太平洋弧形地震带,东亚弧形地震带与中亚弧形地震带,它们控制了几乎所有8级大震的分布;中间层次表现为某种塑性流动网络。
Based on analyzing the configurations of earthquake distribution in China and its surrounding area, 5 prevailing orientations of strong events can be recognized. They are NW, NNW, SN, NE and NEE direction, respectively. The dominative structures of seismicity in China are varied in different layers: in shallow crust are the boundary faults of the crustal blocks; in deep layer are three arcuate seismic belts: the west-pacific seismic belt, east-Asia seismic belt and middle-Asia seismic belt; in the middle layer is a kind of plastic flow network.
出处
《地震》
CSCD
北大核心
1994年第S1期102-109,共8页
Earthquake
基金
"八五"攻关课题(85-04-06-01-02)研究成果
关键词
地震分布
主导构造
主导方向
动力学条件
弧形地震带
earthquake distribution
prevailing orientation
dominative structure
arcuate seismic belt
