| 青藏高原中部日干配错断裂第四纪活动特征及2020年7月23日西藏尼玛Mw6.4地震发震构造分析 |
| |
| 关键词:Riganpei Co fault Yibug Caka graben fault slip rate 2020 Nima Mw6.4 earthquake Tibetan Plateau |
| 基金项目:“第二次青藏高原综合科学考察研究”项目(编号: 2019QZKK0901);国家自然科学基金项目(编号: 41672211; 41941016);国家重点研发计划(编号: 2016YFC0600310);中国地质调查局项目(编号: DD20190059);中国地质科学院地质研究所基本科研业务费项目(编号: JYYWF201810);南方海洋科学与工程广东省实验室(广州)人才团队引进重大专项(编号: GML2019ZD0201) |
| 作者 | 单位 | E-mail | | 刘富财 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
中国地质大学(北京) | 986626411@qq.com | | 潘家伟 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
南方海洋科学与工程广东省实验室(广州) | 43469518@qq.com | | 李海兵 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
南方海洋科学与工程广东省实验室(广州) | | | 孙知明 | 中国地质科学院地质力学研究所 | | | 刘栋梁 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
南方海洋科学与工程广东省实验室(广州) | | | 卢海建 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
南方海洋科学与工程广东省实验室(广州) | | | 郑勇 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
南方海洋科学与工程广东省实验室(广州) | | | 王世广 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所 | | | 白明坤 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所 | | | Marie-Luce CHEVALIER | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
南方海洋科学与工程广东省实验室(广州) | | | 张蕾 | 自然资源部深地动力学重点实验室, 中国地质科学院地质研究所
南方海洋科学与工程广东省实验室(广州) | | | 曹勇 | 中国地质科学院地质力学研究所 | |
|
| 摘要点击次数: 2047 |
| 全文下载次数: 1421 |
| 摘要: |
| Characteristics of Quaternary Activities along the Riganpei Co Fault and Seismogenic Structure of the July 23, 2020 Mw6.4 Nima Earthquake, Central Tibet |
| The Riganpei Co fault (RPCF), located to the north of the Bangong Co–Nujiang suture (BNS), is a NEE–SWW striking left-lateral fault that belongs to the V-shaped conjugate strike-slip fault system of central Tibet. It plays an important role in accommodating coeval east-west extension and NS-trending shortening in the interior of the Tibetan Plateau. Two large earthquakes (M>6) occurred on January 9, 2008 and July 23, 2020 near the southwestern end and northeastern normal splay of the fault, respectively. Therefore, determining the Late Quaternary activity of the fault and its relationship with regional large earthquakes is essential to the better understanding of the active deformation behavior and its influence on regional earthquake nucleation. In this paper, the authors studied the Late Quaternary slip-rate along the RPCF and its tectonic-geomorphologic characteristics based on the interpretation of high-resolution satellite images and field surveys. The seismogenic fault of the Mw6.4 Nima earthquake on July 23, 2020 was also discussed. The results indicate that the RPCF has a significant linear distribution characteristics. It cut through the Quaternary geological and geomorphic units, forming a series of typical fault related tectonic geomorphologic phenomena. The RPCF strikes NEE 60°~80° for ~360 km, with a long-term cumulative displacement of 14~15 km. The late Pleistocene slip rate of the sinistral RPCF is about 0.2~0.3 mm/a, which is significantly lower than the values along the dextral faults south of the BNS. This implies that the mechanisms and dynamics are most likely different in the north and in the south of the BNS. The 2020 Nima Mw6.4 earthquake resulted from recent activity along the Yibug Caka graben, and the seismogenic fault was most likely the normal fault bounding its eastern side. The results obtained by the authors provide a new reference for the deeper understanding of the EW extensional deformation process and the mechanism of large earthquakes in central Tibet during the Quaternary. |
| LIU Fu-cai,PAN Jia-wei,LI Hai-bing,SUN Zhi-ming,LIU Dong-liang,LU Hai-jian,ZHENG Yong,WANG Shi-guang,BAI Ming-kun,Marie-Luce CHEVALIER,ZHANG Lei,CAO Yong.2022.Characteristics of Quaternary Activities along the Riganpei Co Fault and Seismogenic Structure of the July 23, 2020 Mw6.4 Nima Earthquake, Central Tibet[J].Acta Geoscientica Sinica,43(2):173-188. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
|
|
|
|
|