| 鲜水河断裂带色拉哈段中谷村一带的最新地表破裂讨论 |
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| 引用本文： | 韩明明,陈立春,曾蒂,李彦宝,梁明剑,高帅坡,王冬兵,罗亮.鲜水河断裂带色拉哈段中谷村一带的最新地表破裂讨论[J].地质力学学报,2022,28(6):969-980. |
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| 作者姓名： | 韩明明 陈立春 曾蒂 李彦宝 梁明剑 高帅坡 王冬兵 罗亮 |
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| 作者单位： | 1.中国地质调查局成都地质调查中心, 四川 成都 610081 |
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| 基金项目： | 第二次青藏高原综合科学考察研究项目2019QZKK0901国家自然科学基金项目41372218中国地质调查局地质调查项目DD20221811中国地质调查局地质调查项目DD20221635 |
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| 摘 要： | 鲜水河断裂带色拉哈段是2014年康定MS6.3地震的发震断裂段, 其最新一次地表破裂事件(1725年康定7级地震)的离逝时间较长, 是最可能发生7级以上地表破裂型大震的危险地段之一。获得色拉哈段最新地震地表破裂的展布范围对确定断裂带的地震活动历史、评估断裂带的未来地震危险性以及防震减灾具有重要意义。然而, 迄今色拉哈段最新地表破裂的北西端位置仍存有较大争议。对此, 在以往资料认为没有同震地表破裂的中谷村一带开挖了探槽组, 获得了这一带的破裂历史, 其最新一次事件(E6)的限定年代为A.D.746±51之后。综合探槽剖面证据和附近的断错地貌特征以及历史地震资料, 探槽揭露的最新事件E6可能对应1725年康定7级地震, 色拉哈段的地表破裂北西端至少已延伸到中谷村一带。
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| 关 键 词： | 鲜水河断裂带 色拉哈段 地震地表破裂 探槽 2014年康定6.3级地震 |
| 收稿时间： | 2022-06-17 |
Discussion on the latest surface ruptures near the Zhonggu village along the Selaha segment of the Xianshuihe fault zone |
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| Institution: | 1.Chengdu Center of China Geological Survey, Chengdu 610081, Sichuan, China2.Institute of Geology, China Earthquake Administration, Beijing 100029, China3.College of Earth Sciences, Guilin University of Technology, Guilin 541006, Guangxi, China4.Sichuan Earthquake Administration, Chengdu 610041, Sichuan, China5.School of Earth Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, China |
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| Abstract: | The Selaha segment of the Xianshuihe fault zone was the seismogenic fault of the 2014 Kangding MS 6.3 earthquake. This segment has been considered as one of the most dangerous areas for surface rupture-induced earthquakes with a magnitude of M≥7 due to the long elapsed time of the latest surface rupture event (the 1725 Kangding MS7.0 earthquake). Obtaining the spatial distribution of the latest seismic surface rupture along the Selaha fault is significant for determining the seismic activity history, assessing the seismic potential, and preventing and mitigating disasters. However, there is still considerable controversy about the extension northwestern of the latest surface rupture. In order to solve this problem, we excavated two large paleoseismic trenches in the Zhonggu village where the previous data believed that there was no coseismic surface rupture, and obtained the rupture history of this region. The latest event (E6) occurred after A.D.746±51. Based on the trench profile evidence, geomorphological features, and historical earthquake records, the latest event E6 is associated with the 1725 Kangding MS7.0 earthquake, indicating that the surface rupture of the event E6 has extended to at least the Zhonggu village. |
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