摘要
1988年至2001年,青藏块体中部的巴颜喀拉块体沿其北部边界的东昆仑断裂带连续发生了3次7级以上和1次8.1级地震。之后,在其西部边界于2008年发生了于田7.3级地震,东部边界的龙门山断裂带发生了2008年汶川8.0级地震,在南部边界的甘孜—玉树—风火山断裂带上发生了2010年玉树7.1级地震。对这一系列地震的震源机制解分析,结果表明,除西边界的于田7.3级地震为正断层性质、东边界的汶川8.0级地震为逆断层性质以外,其他断裂带上的地震性质均以走滑为主,总体表明巴颜喀拉块体具有向东走滑的特性。本文尝试根据构造相互作用和块体运移特征等对这几次地震进行相关分析。
There occurred 3 times Ms≥7 and 1 time Ms8 earthquakes along the northern boundary of Kunlun fault in the Central area of Tibet block of Bayankala block from 1988 to 2001. And after 6 years later, there occurred Ms7.3 earthquakes in the western border area of Yutian in 2008,and the eastern boundary of Longmen mountain fault occurred Wenchuan Ms8.0 earthquake. After 2 years quiet, the southern boundary of Yushu - Ganzi-Fenghuoshan fault occurred MsT. 1 earthquake. The focal mechanism solution from this series of earth- quake is analyzed, the results indicate that except Yutian Ms7.3 earthquake is normal fault and Wenchuan MsS. 0 earthquake is reverse fault, the others are mainly slip faults. It shows that the Bayankala active block is squeezed out of from Tibet block to the east. In this paper,we attempt to analyze the relationship according to the structural interactions and block movement of these earthquakes.
出处
《高原地震》
2013年第1期15-21,共7页
Plateau Earthquake Research
基金
国家留学基金
中国地震局星火计划(XH12051Y)
青海省地震工程研究院课题联合资助
关键词
青藏块体
强地震
触发作用
Qinghai-Tibet block
Strong earthquake
Triggering effect
