2007年宁洱6.4级地震前地震学异常的动态演化  

Dynamic Evolution of Seismological Anomalies before the 2007 Ning'er,Yunnan,M_S6.4 Earthquake

作　　者：李永莉[1] 毛慧玲[1] 付虹[1] 

机构地区：[1]云南省地震局,昆明650224

出　　处：《地震研究》2007年第4期318-323,共6页Journal of Seismological Research

基　　金：国家科技支撑计划(2006BAC01B03-02-01)资助.

摘　　要：2007年宁洱6.4级地震前,在中国大陆和云南省6级强震平静及滇西南地区5、6级地震出现丛集现象的背景下,动态追踪了滇西南地区各项地震学参数异常的中、短临演化过程。结果表明,2005、2006年滇西南地区近同步出现中小地震活跃、调制小震频发、震源深度加深、b值由高到低等中短期异常,而2007年云南省内大于等于25天的3级地震平静异常和滇西南3级震群的密集,则预示着强震的逼近,尤其是3级地震时空密集,是宁洱6.4级地震的显著短临标志。Before the 2007 Ning＇er Ms6.4 earthquake, M ≥6 earthquakes kept quiet during a long time in China Mainland and Yunnan Province, and M5.0-6.0 earthquakes occurred clusteringly in Southwest Yunnan. Under this background, we dynamically traced the evolution process of seismological anomalies during the Ning ＇er earthquake preparation. In 2005-2006, many medium-, short-term anomalies, such as active medium-small shocks, frequent modulating small shocks, deepening focal depth and b-values varying from high to low, appeared almost synchronously in Southwest Yunnan. In 2007, appeared the M3.0 earthquake quiescence beyond 25 days in Yunnan and dense M3.0 earthquake swarms in Southwest Yunnan, which predicts that a strong earthquake is impending. The denseness of M3.0 earthquakes in time and space can be seen as an obvious im- pending-earthquake mark of the Ning＇er earthquake.

关 键 词：宁洱地震 中期异常 短临异常 云南地区 

分 类 号：P315.75[天文地球—地震学]