青藏高原6.0～6.9级地震前M_L≥4地震平静异常研究  

Research on Quiescence Anomaly of M_L≥4.0 Earthquakes before M6.0～6.9 Earthquakes in Qinghai-Tibetan Plateau

作　　者：陈玉华[1] 姚家骏[1] 马玉虎[1] 

机构地区：[1]青海省地震局,青海西宁810001

出　　处：《地震研究》2014年第S1期1-7,共7页Journal of Seismological Research

基　　金：青海省地震科学基金项目(2012A05);国家"十二五"科技支撑计划子专题"南北地震带强震综合预测与跟踪方法研究(2012BAK19B01-07)"联合资助

摘　　要：对1975年以来青藏高原36个(25组)6.0~6.9级强震前ML≥4地震活动图像演化特征跟踪分析,发现92%的地震前震源区及外围出现清晰的ML≥4地震平静区。平静面积多在1×106km2内,平静时段多集中在200~700 d,92%的地震发生在平静区内部。从地震预测角度认为,ML≥4地震大面积平静为青藏高原6.0~6.9级地震前一个具有鲜明特征的共性异常,它可以为青藏高原6级地震发生地点的判定、场的追踪提供依据。Tracing and analyzing the seismic activity evolution characteristic of ML≥4 earthquakes before 36( 25groups) M6.0 ~ 6.9 strong earthquakes in Qinghai-Tibetan Plateau since 1975,we found that there appeared the clear seismic quiescence area of ML≥4 earthquakes in epicenter and its periphery before 92% earthquakes.The area of seismic quiet was less than 1 × 106km2,the quiet period focused on 200 ~ 700 d,and the 92%earthquakes occurred inside the seismic quiet area.On the aspect of earthquake prediction,we considered that the large area of seismic quiet of ML≥4 earthquakes was the common anomaly with distinct characteristic before M6.0 ~ 6.9 earthquakes in Qinghai-Tibetan Plateau,which could be used to judge the location of M6.0 earthquake in Qinghai-Tibetan Plateau,and provide the basis of field tracing.

关 键 词：6.0~6.9级地震 地震平静 青藏高原 

分 类 号：P315.72[天文地球—地震学]