地震强度因子M_f值在华南和东北地区中强以上地震前的中短期异常变化  

SHORT MEDIUM TERM ANOMALOUS VARIATION OF SEISMIC STRENGTH FACTOR M_f VALUE PRIOR TO EARTHQUAKES OVER MODERATE MAGNITUDE IN SOUTH AND NORTHEAST CHINA

作　　者：王炜[1] 章纯[1] 

机构地区：[1]上海市地震局,上海200062

出　　处：《地震学刊》1999年第4期1-6,共6页Journal of Seismology

基　　金：中国地震局九五基金!(19950406)

摘　　要：用反映地震活动增强特征的地震强度因子Mf 值,系统研究了其在华南和东北地区中强以上地震前的中短期( T≤1 年) 异常变化。结果发现在震前1 年左右,半数震例的震中附近地区出现Mf 值中期异常区明显收缩,即可认为出现Mf 值中短期异常,亦即认为当前已进入地震孕育的中短期阶段。笔者通过对MfThe short medium term(T≤1 year) anomalous variations prior to the earthquake over moderate magnitude are systematically studied for south and northeast China using the seismic strength factor M f value reflecting seismicity increase characteristics. It is found that the medium term anomalous area of M f value near epicentre obviously decrease in 50% earthquake cases in some 1 year before earthquake, which is considered as the short medium term anomaly of M f value.

关 键 词：地震强度因子M_f值 地震活动性 地震预报 

分 类 号：P315.7[天文地球—地震学]