摘要
利用祁连县地应变观测资料,对1992年6月青海祁连克克里5.1级地震信息进行了综合分析。提出了主应变比异常理论,在该理论的基础上探讨了该次地震的发震机制。同时分析了祁连建站以来的地应变观测资料,认为肃南～祁连断裂段上及附近发生的地震具有相似性,是在变化的附加引张应力场作用下,载荷弱化,促使正断层或正走滑断层易于活动所导致的。
Based on the observed data of the crustal strain in Qilian County, the information of Kekeli earthquake (Ms = 5.1) in June 1992. in Qilian County, Qinghai Province is comprehensively analyzed. The theory of the principal strain ratio anomaly is advanced. The seismogenic mechanism is explored using this theory. Analyses of observed ground strain data from Jun. 1990 to Oct. 1992 show the similarity of earthquakes occurred along Qilian-Sunan fracture zone and in nearby regions. The similarity is resulted from activities along normal or strike-slip faults caused by the load-weakening due to change of additional tensional stress field.
出处
《地震》
CSCD
北大核心
1996年第4期409-416,共8页
Earthquake
基金
甘肃省自然科学基金资助项目(ZR-93-036)
关键词
地震前兆
应力场
青海
应变比分析
Earthquake precursor, Stress field, Principal strain ratio, Loading
