昆仑山口西8.1级地震前青藏块体边界断层异常活动

Anomalous fault activity along the boundary of Qinghai-Xizang block before the kunlunshankou earthquake with M=8.1

系统分析了青藏块体边界断层的形变资料,研究了断层活动的动态过程及空间分布。结果表明,昆仑山口西8.1级地震前孕震影响范围达到青藏块体的周边地区;发震断层所在的构造带震前断层活动最为剧烈;加强对构造块体断层整体活动的宏观动态比较和分析,有助于判定未来强震发生的危险地段;震后应力将转移并集中到西秦岭构造带及其邻近地区。

In this paper the authors have analyzed the data of mobile geodetic deformations across faults along the boundary of Qinghai-Xizang block. Studied dynamic evolution and spatial distribution of fault movement. The results show that the incidence area of earthquake preparation of the Kunlunshankou earthquake (Ms=8.1) reached the peripheral region of Qinghai-Xizang block. The fault movement is the strongest in the tectonic belt, where the seismogenic fault is situated. Comparing and analyzing the macroscopic dynamics of integral faulting activity of tectonic block is useful to judge the danger zone for strong earthquakes. The stress after earthquakes will be migrated and concentrated to Xiqinling tectonic belt and its neighboring area.