青藏高原北部地区地震空区初步研究  

Preliminary Study on the Seismic Gap in the Northern Area of the Qinghai-Tibet Plateau

作　　者：董治平[1] 杨立明[1] 姚军[1] 

机构地区：[1]中国地震局兰州地震研究所,兰州730000

出　　处：《地震研究》2005年第1期6-11,共6页Journal of Seismological Research

基　　金：中国地震局"十五"科技攻关子专题(2001BA601B01-03-01);地震联合基金资助课题(197025)资助;中国地震局兰州地震研究所论著编号:LC20040065.

摘　　要：研究了青藏高原北部地区地震空区的时空演化特征,结果表明大部分MS≥5地震在孕育发展过程中会形成空区,从孕震空区形成到发震,最短时间1个月,最长时间2a,优势发震时段为4～15个月。孕震空区可作为青藏高原北部地区MS≥5地震1年尺度的中期预报指标;逼近地震的出现可作为孕震空区形成之后半年内发震的短期指标。In this paper, the features of spatial-temporal distribution and processes of evolution of seismic gap are studied in the northern area of Tibet Plateau. The results show the seismic gap may form in the process of preparation and development of major M_S≥5.0 earthquakes in this area. The duration from the forming of the seismogenic gap to the occurrence of the earthquake is 1 (the shortest time) to 24 (the longest time) months and the most possible occurrence time is 4-15 months. So it can be regarded as a mid-term (one year) prediction index of M_S≥5.0 earthquakes in the northern area of Tibet Plateau, and the imminent earthquake may be taken as a short-term index of half a year in earthquake prediction after a seismogenic gap forms.

关 键 词：地震空区 孕震空区 时空演化特征 青藏高原北部地区 

分 类 号：P315.5[天文地球—地震学]