2013年甘肃岷县漳县6.6级地震震害分布特征及发震构造分析

doi:10.3969/j.issn.0253-4967.2013.03.014

地震地质 ›› 2013, Vol. 35 ›› Issue (3): 604-615.DOI: 10.3969/j.issn.0253-4967.2013.03.014

• 岷县漳县M_S6.6地震科考 • 上一篇下一篇

2013年甘肃岷县漳县6.6级地震震害分布特征及发震构造分析

郑文俊¹, 闵伟², 何文贵³, 任治坤¹, 刘兴旺³, 王爱国³, 许冲², 李峰^2,4

1. 中国地震局地质研究所, 地震动力学国家重点实验室, 北京 100029;
2. 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029;
3. 中国地震局兰州地震研究所, 兰州 730000;
4. 中国地震灾害防御中心, 北京 100029

收稿日期:2013-08-15 修回日期:2013-08-28 出版日期:2013-09-30 发布日期:2013-10-12
作者简介:郑文俊,男,1972年生,2003年在中国地震局兰州地震研究所获构造地质学专业硕士学位,2009年在中国地震局地质研究所获构造地质学专业博士学位,副研究员,主要从事活动构造、新构造及构造地貌等方面的研究工作,电话:010-62009433,E-mail:gszhwj@163.com。
基金资助:
中国地震局地震行业科研专项(201008003);中国地震局地质研究所基本科研业务专项 (IGCEA1220)和国家自然科学基金(41172194,41030317)共同资助

DISTRIBUTION OF THE RELATED DISASTER AND THE CAUSATIVE TECTONIC OF THE MINXIAN-ZHANXIAN M_S6.6 EARTHQUAKE ON JULY 22,2013,GANSU,CHINA

ZHENG Wen-jun¹, MIN Wei², HE Wen-gui³, REN Zhi-kun¹, LIU Xing-wang³, WANG Ai-guo³, XU Chong², LI Feng^2,4

1. State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
3. Lanzhou Institute of Seismology, China Earthquake Administration, Lanzhou 730000, China;
4. China Earthquake Disaster Prevention Center, Beijing 100029, China

Received:2013-08-15 Revised:2013-08-28 Online:2013-09-30 Published:2013-10-12

摘要/Abstract

摘要：

2013年7月22日,甘肃岷县漳县M_S 6.6地震发生在南北地震带的中北段,东昆仑断裂和西秦岭北缘断裂是该地区复杂多样的构造几何特征中2条主要的边界控制断裂。这次地震的震害分布与临潭-宕昌断裂的走向基本一致,为长轴走向NWW的椭圆,极震区内严重破坏范围也完全位于该断裂带内,这与临潭-宕昌断裂复杂的几何结构密切相关,也说明地震的发生是多条次级断裂共同作用的结果。综合分析认为,受西秦岭北缘断裂带向南侧的扩展和青藏高原向NE扩展过程中东昆仑断裂带的NE向挤压作用共同影响下的临潭-宕昌断裂是这次地震的发震构造。

关键词: 岷县漳县6.6级地震, 地震震害, 发震构造, 临潭-宕昌断裂, 甘东南地区

Abstract:

On July 22,2013,the Minxian-Zhanxian M_S 6.6 earthquake occurred at the central-northern part of the South-North Seismic Belt. In the area,complicated structural geometries are controlled by major strike-slip fault zones,i.e.the Eastern Kunlun Fault and the Northern Frontal Fault of West Qinling. The distribution of related seismic disasters,namely,the ellipse with its major axis trending NWW,is in good accord with the strike of the Lintan-Tanchang Fault. Severe damages in the meizoseismal area of the Minxian-Zhangxian M_S 6.6 earthquake are located within the fault zone. So it is considered that the earthquake related damages are closely related to the complicated geometry of the Lintan-Tanchang Fault,and it also indicates that the earthquake is the outcome of joint action of its secondary faults. Based on field investigations,and by integrating the results of previous studies on active tectonics,structural deformation and geophysical data,it can be inferred that the southward extension of the Northern Frontal Fault of West Qinling and the northeastward extrusion of the Eastern Kunlun Fault in the process of northeastward growth of Tibetan plateau are the main source of tectonic stress. Basic tectonic model is provided for strong earthquake generation on the Lintan-Tanchang Fault.

Key words: Minxian-Zhanxian M_S 6.6 earthquake, related disaster, causative tectonic, Lintan-Tanchang Fault, southeastern Gansu

中图分类号:

P315.5

郑文俊, 闵伟, 何文贵, 任治坤, 刘兴旺, 王爱国, 许冲, 李峰. 2013年甘肃岷县漳县6.6级地震震害分布特征及发震构造分析[J]. 地震地质, 2013, 35(3): 604-615.

ZHENG Wen-jun, MIN Wei, HE Wen-gui, REN Zhi-kun, LIU Xing-wang, WANG Ai-guo, XU Chong, LI Feng. DISTRIBUTION OF THE RELATED DISASTER AND THE CAUSATIVE TECTONIC OF THE MINXIAN-ZHANXIAN M_S6.6 EARTHQUAKE ON JULY 22,2013,GANSU,CHINA[J]. SEISMOLOGY AND GEOLOGY, 2013, 35(3): 604-615.

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2013年甘肃岷县漳县6.6级地震震害分布特征及发震构造分析

DISTRIBUTION OF THE RELATED DISASTER AND THE CAUSATIVE TECTONIC OF THE MINXIAN-ZHANXIAN M_S6.6 EARTHQUAKE ON JULY 22,2013,GANSU,CHINA

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2013年甘肃岷县漳县6.6级地震震害分布特征及发震构造分析

DISTRIBUTION OF THE RELATED DISASTER AND THE CAUSATIVE TECTONIC OF THE MINXIAN-ZHANXIAN MS6.6 EARTHQUAKE ON JULY 22,2013,GANSU,CHINA

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DISTRIBUTION OF THE RELATED DISASTER AND THE CAUSATIVE TECTONIC OF THE MINXIAN-ZHANXIAN M_S6.6 EARTHQUAKE ON JULY 22,2013,GANSU,CHINA