巨大地震前一种与活动地块相关联的5级地震异常活动现象  

Anomaly phenomenon of seismicity with M≈5.0 associated with active block before great strong earthquakes

作　　者：张晓东[1] 王慧敏[1] 吕梅梅[1] 

机构地区：[1]中国地震局分析预报中心,北京100036

出　　处：《地震》2004年第1期1-6,共6页Earthquake

基　　金：十五"国家科技攻关项目(01 05 07);国家863项目(2001AA115012)

摘　　要：通过对中国大陆1900年以来所有的12次M≥7.7地震前5级地震活动特征进行详细的研究和分析,包括分析发生的5级以上地震距未来巨大地震的时间间隔,5级以上地震发震位置和未来巨大地震位置的关系。结果表明,在M≥7.7地震前1年内,在600km范围内至少发生1次5级以上地震。发生的5级地震位置一般在未来M≥7.7地震所在的活动地块同一边或对边。研究认为,无论未来M≥7.7地震前5级以上地震是活跃还是平静状态,这一现象都存在,具有普适性特点。By studying and analyzing the characteristics of seismicity with M_S≥5.0 before twelve great strong earthquakes (M_S≥7.7), the time interval of M_S≥5.0 earthquakes and great strong earthquakes, and the location of the earthquakes with M_S≥5.0 and M_S≥7.7, it indicates that one year before the earthquakes with M≥7.7 and within the range of 600 km^2, at least one earthquake with M>5.0 occurs. The location of earthquakes with M>5.0 are usually situated on the same or opposite side of the active block, where the earthquakes with M≥7.7 will occur. No matter what seismicity with M_S≥5.0 is active and quiet, this phenomenon occurs everywhere and typical.

关 键 词：活动地块 地震活动性 地震构造 震源 地震前兆 

分 类 号：P315.72[天文地球—地震学]