| 巴颜喀拉块体内部五道梁-长沙贡玛断裂中段全新世活动及最新古地震证据 |
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| 引用本文： | 梁明剑,黄飞鹏,孙凯,张会平,吴微微,张佳伟,杜方,周文英.巴颜喀拉块体内部五道梁-长沙贡玛断裂中段全新世活动及最新古地震证据[J].地球科学,2022,47(3):766-778. |
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| 作者姓名： | 梁明剑 黄飞鹏 孙凯 张会平 吴微微 张佳伟 杜方 周文英 |
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| 作者单位： | 1.四川省地震局，四川成都 610041 |
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| 基金项目： | 地震动力学国家重点实验室开放基金课题(No.LED2020B02)； |
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| 摘 要： | 为揭示巴颜喀拉块体内部构造变形特征，基于地震地质调查和新年代学方法研究了五道梁-长沙贡玛中段的最新活动性.地质地貌和探槽揭露的证据显示，五道梁-长沙贡玛断裂中段为全新世活动的左旋走滑断裂，也表明其作为巴颜喀拉块体内部的主干断裂之一，具有孕育和发生强震的构造条件.该断裂中段的最晚一次古地震事件发生在（4 409~4 225）a BP之后，距今可能超过千年；而且近两年来断裂中东段小震活动频繁，2020年4月1日发生了5.6级中强地震，其未来的地震危险性需引起关注.
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| 关 键 词： | 青藏高原 五道梁-长沙贡玛断裂 巴颜喀拉块体 地震危险性 地震学 |
| 收稿时间： | 2021-12-11 |
The Holocene Activity and Its Evidence from Paleoearthquake of the Middle Segment of Wudaoliang-Changshagongma Fault Inside the Bayan Har Block |
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| Abstract: | To reveal the internal tectonic deformation characteristics of the Bayan Har block, this paper studies the middle segment of the Wudaoliang-Changshagongma fault activity of the Late Quaternary based on seismic geological survey and new chronological methods. The geological and geomorphological evidences show that the middle segment of the Wudaoliang-Changshagongma fault is a Holocene left-lateral strike-slip fault, indicating that the fault has tectonic condition for generating strong earthquakes as one of the main faults inside the Bayan Har block. The latest paleoearthquake event on the middle segment of the fault occurred after (4 409-4 225) a BP. The elapsed time may be more than a thousand years. Moreover, small earthquakes have been active on this segment in the past two years. And a M5.6 earthquake occurred on it on April 1st, 2020. So, we should pay attention to the strong earthquake risk of the fault in the future. |
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