西北地区M_S≥7强震前地震活动特征和近期强震趋势研究  

Research on Seismic Activity Characteristics before M_S7.0 Strong Earthquakes and Recent Trend of Strong Earthquake in Northern Qinghai-Tibetan Plateau and Northwest of Qinghai

作　　者：马玉虎[1] 殷翔[1] 苏有锦[2] 

机构地区：[1]青海省地震局,青海西宁810001 [2]云南省地震局,云南昆明650224

出　　处：《地震研究》2014年第S1期8-15,共8页Journal of Seismological Research

基　　金：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);青海省科技厅项目(2013-Z-710)联合资助

摘　　要：通过对西北地区8次MS≥7强震前的MS≥5地震活动特征和3次MS≥7强震前的ML4地震演化的研究,发现西北地区7级强震前存在较大范围的MS≥5地震平静或MS5地震空区。该地区强震前存在ML≥4地震空区的演化,一般表现为孕震区周围出现平静—活跃、持续平静和平静区逐步向未来震中收缩的特征。Analysis on the seismic activity characteristics of MS≥5 earthquakes before eight MS7 strong earthquakes and seismic activity evolution of ML4 earthquakes before three MS7 strong earthquakes in the Northwest region,we found that there exited a large range of seismic quiet area of MS5 earthquakes and seismic gap of MS5 earthquakes.The evolution of seismic gap of ML4 earthquakes exited before MS7 strong earthquake in Northwest region,and its characteristic appeared the quiet-active、sustained quiet and the quiet area gradually coming to the epicenter in the future in generally.

关 键 词：西北地区 MS≥7级强震 地震活动 强震趋势 

分 类 号：P315[天文地球—地震学]