用现今小震推断洪洞、临汾两次历史大震的震源断层  

Application of Present Small Earthquakes to Infer the Focal Faults of Two Large Historical Earthquakes in Hongdong and Linfen, Shanxi Province

作　　者：胡新亮[1] 刁桂苓[1] 高景春[1] 张四昌[1] 啜永清[2] 段跃荣[2] 赵英萍[1] 刘胜国[1] 朱振兴[1] 张彦清[1] 秦清娟[1] 

机构地区：[1]河北省地震局,中国石家庄050021 [2]山西省地震局,中国太原030002

出　　处：《中国地震》2002年第1期76-85,共10页Earthquake Research in China

基　　金：国家重点基础研究发展规划 (D19980 40 70 40 1);山西省自然科学基金 (2 0 0 110 2 7)资助

摘　　要：山西临汾地区是一个历史强震多发区 ,130 3年和 16 95年发生了洪洞 (M =8)和临汾(M =7 )两次特大地震。这两次地震所在区域至今仍有持续不断的小地震活动 ,具有明显的大震区地震长期活动特征。我们对临汾无线传输地震台网记录的 1987～ 1999年期间发生的16 70次中、小地震重新进行了震源定位。根据对这些地震震源位置三维空间分布特征和震源机制解的分析 ,认为洪洞地震的震源断层应是长 80km ,埋深 5～ 2 6km的NNE走向、高倾角的右旋走滑型断层 ,而临汾地震的震源断层是长 70km ,埋深 5～ 2 2km的NWW走向、高倾角的左旋走滑型断层。这与洪洞。Linfen, located in Shanxi Province, is a seismic area in China, where many strong earthquakes occurred in history, among those are the famous Hongdong M8.0 earthquake (1303) and Linfen earthquake (1695). A large number of small earthquakes have been recorded continually for the years in the areas where the two earthquakes occurred, showing the long-term seismic active feature of the earthquake areas. We relocated 1670 small earthquakes from 1987 to 1999 recorded by Linfen wireless seismic network. Based on the analysis to the feature of spatial distribution of hypocenters and focal mechanisms, the focal fault of Hongdong earthquake is inferred to be a right-lateral slip fault, which is striking to NNE with high dip, 80km in length, and 5～26km in depth, while the Linfen earthquake's to be a left-lateral slip fault, striking to NWW with high dip, and 70km in length, and 5～22km in depth. The fault planes inferred are consistent with the direction of isoseisms, stress field and tectonic feature of Hongdong and Linfen earthquake areas.

关 键 词：震源断层 洪洞地震 临汾地震 小地震 应力场 构造环境 

分 类 号：P315.2[天文地球—地震学] P316.2[天文地球—固体地球物理学]