【摘要】 2006年7月4日河北文安5.1级地震属于孤立型地震,无法根据地震序列提取更多信息,故将该地震与1967年3月27日河间6.3级地震、1973年12月31日河间5.3级地震合并作为一个整体,与邢台地区部分地震作对比分析。由此总结出文安及附近地区地震的活动特点:①呈NNE和NWW共轭分布;②各次地震的时间间隔大幅增长;③余震频度逐渐降低,衰减逐渐加快;④类型向孤立型地震过渡;⑤宏观烈度均比估算烈度低1度左右;⑥震源机制趋于一致。更多还原

【Abstract】 Wenan M5.1 earthquake in Hebei on Jul.4 in 2006 is isolated type,and cannot extract more information from the earthquake sequence,so we combine this earthquake with Hejian M6.3 earthquake on Mar.27 in 1967 and the Hejian M5.3 earthquake on Dec.31 in 1973 as a whole,compared with some earthquakes occurred in Xingtai region,and summed up the earthquake activity characteristics in Wenan and its surrounding area:NNE—NWW conjugate distribution,the earthquake time interval increased significantly,the aftershocks frequency reduced gradually;the attenuation accelerated gradually,transition to isolated types,all the macro intensity was about one degree lower than the estimated;the coherence parameter of focal mechanism became consistent.更多还原