| 2012年缅甸德贝金M7.0地震及其地表破裂特征 |
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| 引用本文： | 常祖峰,张建国,申重阳,李春光,刘昌伟,王光明,于江.2012年缅甸德贝金M7.0地震及其地表破裂特征[J].地质力学学报,2022,28(2):169-181. |
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| 作者姓名： | 常祖峰 张建国 申重阳 李春光 刘昌伟 王光明 于江 |
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| 作者单位： | 1.云南省地震局,云南 昆明 650224 |
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| 基金项目： | 国家自然科学基金（U2002211）;国家国际科技合作专项（2015DFA21260） |
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| 摘 要： | 文章以地质地貌与地震遗迹野外调查获得的第一手资料为基础,重点介绍了实皆断裂的活动习性、2012年地震产生的建筑物破坏与地震地表破裂带特征.实皆断裂是一条规模宏大,以右旋走滑为主的全新世活动断裂,其水平滑动速率为18～20 mm/a.历史上沿实皆断裂曾发生10余次7级以上强震,迄今保留有1839年曼德勒因瓦M 8、193...
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| 关 键 词： | 德贝金 地震 实皆断裂 地震地表破裂 右旋走滑 |
| 收稿时间： | 2021/11/27 0:00:00 |
| 修稿时间： | 2022/1/20 0:00:00 |
The 2012 Thabeikkjin (Myanmar) M 7.0 earthquake and its surface rupture characteristics |
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| CHANG Zufeng,ZHANG Jianguo,SHEN Chongyang,LI Chunguang,LIU Changwei,WANG Guangming,YU Jiang.The 2012 Thabeikkjin (Myanmar) M 7.0 earthquake and its surface rupture characteristics[J].Journal of Geomechanics,2022,28(2):169-181. |
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| Authors: | CHANG Zufeng ZHANG Jianguo SHEN Chongyang LI Chunguang LIU Changwei WANG Guangming YU Jiang |
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| Institution: | 1.Yunnan Earthquake Administration, Kunming 650224, Yunnan, China2.Institute of seismology, China Earthquake Administration, Wuhan 430071, Hubei, China |
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| Abstract: | Based on the first-hand data obtained from the field survey in terms of geology, landforms, earthquake ruins, this paper focuses on the activity behavior of the Sagaing fault, as well as the damaged buildings and seismic surface rupture zone generated by the 2012 earthquake. The Sagaing fault striking nearly NS is an active large-scale dextral strike-slip fault, with a horizontal slip rate of 18~20 mm/a. Many strong earthquakes more than M 7 have occurred along the Sagaing fault zone historically, and so far, there are still ruins of the earthquakes, such as the 1839 Innwa, Mandalay, M 8 earthquake, the 1930 Bago M 7.3 earthquake and the 1930 Phyu M 7.3 earthquake. The 2012 Thabeikkjin M 7.0 earthquake caused serious damage to pagodas, civil and other buildings, forming an at least 45 km-long seismic surface rupture with bank collapses, landslides, seismic faults and so on. The epicenter intensity of the earthquake is estimated to be IX. Under the dextral strike slip of the fault, the ground fissures show a trend of regular left-step en echelon, and the included angle with the strike of the Sagaing fault is generally 20°~30°; The large-scale ground fissures mostly show a "S" type. The regular left-step en echelon trend of ground fissures and the faulted ground features indicate that the seismic surface fracture are obviously characterized by dextral strike slip. The horizontal dextral displacements caused by the 2012 earthquake are generally between 40~90 cm, and the maximum reaches 102 cm. The surface rupture characteristics and the results of focal mechanism solutions show that the event is caused by the dextral strike-slip of the Sagaing fault. |
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| Keywords: | Thabeikkjin earthquake Sagaing fault seismic surface rupture dextral strike-slip |
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