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2013年甘肃岷县-漳县6.6级地震烈度异常点分布及成因
陈正位1) 土登次仁2) 闫小兵3)
1) 中国地震局地震预测研究所,北京市复兴路63 号100036;2) 西藏自治区地震局,拉萨850000;3) 山西省地震局,太原030021
摘要:
2013年7月22日甘肃岷县-漳县Ms6.6地震发生在临潭-宕昌断裂的东段,遥感和DEM研究表明,该断裂东段在晚第四纪以来仍有活动,自岷县至宕昌,断裂由左旋走滑兼具逆冲性质转为以左旋走滑性质为主。现场烈度和灾害调查发现,Ⅶ度区内形成Ⅷ度的异常点,在Ⅵ度区内形成Ⅶ度的异常点,这些异常点分布在沿断裂带附近约2km 的范围内,主要分布在断层的上盘。进一步研究表明,由于临潭-宕昌断裂在岷县以南以走滑运动为主,强震动主要沿断裂传播,同时由于断裂活动形成软弱地基,强震动引起地基失效造成灾害,形成了烈度异常点。
关键词:  岷县-漳县6.6 级地震  临潭-宕昌断裂  地震烈度  灾害
DOI:
分类号:
基金项目:中国地震局地震预测研究所基本科研业务费专项(2012IES010202)资助
Abnormal earthquake intensity points and its mechanism of the Minxian-Zhangxian MS6. 6 earthquake on July 22,2013,Gansu
Chen Zhengwei1) Tudeng Ciren2) Yan Xiaobing3)
1) Institute of Earthquake Science,CEA,Beijing 100036,China;2) Earthquake Administration of Xizang Autonomous Region,Lhasa 850000,China;3) Earthquake Administration of Shanxi Province,Taiyuan 030021,China
Abstract:
On July 22,2013,the Minxian-Zhangxian MS6. 6 earthquake occurred on the east segment of Lintan-Dangchang fault. The analysis of digital elevation and remote sense image shows that the east segment of Lintan-Dangchang fault is still active and the main thrust feature of the fault switches to left lateral slip. With the field research of intensity and damages,several abnormal points of 8 degree spread in isoseismal line of 7 degree and some abnormal points of 7 degree spread in isoseismal line of 6 degree. These abnormal points distribute along the hanging wall of the fault in width of 2km. The analysis based on remote sense and digital elevation model shows that the segment of the Lintan-Dangchang fault south Minxian mainly slips in left literal. The fault movement made the soil soft in the fault zone. The earthquake motion propagates along the fault zone. The strong earthquake motion causes foundation failure in the soft soil along the fault zone and the abnormal intense points of disaster formed.
Key words:  Minxian-Zhangxian MS6.6 earthquake  Lintan-Dangchang fault  Earthquake intensity  Disaster