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云南1588年通海-曲江7.0级地震的发震断层厘定及小江断裂带南端的未来强震危险性问题
投稿时间:2019-09-24  修订日期:2019-11-27  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020036
摘要点击次数: 362
全文下载次数: 189
作者单位E-mail
胡萌萌 中国地质科学院地质力学研究所 &北京大学 15029028127@163.com 
吴中海 中国地质科学院地质力学研究所 wuzhonghai@geomech.ac.cn 
黄小龙 中国地质科学院地质力学研究所  
李浩民 江苏省地质调查研究院  
中文摘要:云南地处青藏高原东南缘,发育众多活动断裂,是典型的历史强震多发区。1588年通海-曲江7.0级地震发生在近南北向小江断裂带与北西向曲江断裂的交汇部位。前人基于该处曲江断裂行迹较明显,活动性较强,并且具有发生7级以上大震的潜能,多认为其为该地震的发震断层。但本文在重新梳理地震史料基础上,通过遥感解译和地表调查,发现小江断裂带南段西支并未被曲江断裂截断于其北侧,而是错断并穿过曲江断裂继续南延。结合对曲江断裂7级以上地震复发能力的计算,笔者认为1588年通海-曲江7.0地震的发震构造应该是小江断裂带西支的南延段落。同时,根据烈度-震级关系式和地表破裂长度-震级的关系式计算得到1588年通海-曲江地震的震级很可能只有6.5级左右,其强度可能被高估。基于新的调查研究结果,进一步对小江断裂带南端的活动构造格局及未来地震危险性进行重新分析后认为,小江断裂带南段与北西向的曲江断裂与石屏断裂之间存在相互切割限制的关系,具有典型的构造复合关系。两组断裂交汇部位常常是拉分盆地的发育部位,形成有高大谷地,曲江盆地和建水盆地等一系列拉分盆地。对该区历史上震中烈度≥Ⅸ度的地震重新梳理后,发现小江断裂带南段东支建水以北是该区显著的历史地震空区,在未来的防震减灾工作中需给与更多关注。
中文关键词:小江断裂带  曲江断裂  1588年通海-曲江地震  发震断层  活动构造格局  地震危险性
 
Definition of seismogenic fault for the 1588 Tonghai-Qujiang M7.0 earthquake in Yunnan Province and future strong earthquake risk at the southern end of Xiaojiang fault zone
Author NameAffiliationE-mail
Hu Mengmeng Insititute of Geomechanics, Chinese Academy of Geological Science &
Peking University 
15029028127@163.com 
Wu Zhonghai Insititute of Geomechanics, Chinese Academy of Geological Science wuzhonghai@geomech.ac.cn 
Huang Xiaolong Insititute of Geomechanics, Chinese Academy of Geological Science  
Li Haomin Jiangsu Institute of geological survey  
Abstract:Located in the southeastern margin of the Tibetan Plateau, Yunnan Province has many active faults. It is a typical historical strong earthquake-prone area. The 1588 Tonghai-Qujiang M7.0 earthquake occurred at the junction of the nearly north-south left-lateral strike-slip Xiaojiang fault zone and the north-west right-lateral strike-slip Qujiang fault zone. The predecessors made the Qujiang fault as the seismogenic fault because of its obvious track, strong activity and the potential of occurrence of large earthquakes with magnitude 7 or above. On the basis of reorganizing the historical data of earthquakes, combining with remote sensing interpretation and surface survey, it is found that the West Branch of the southern part of the Xiaojiang fault zone is not truncated by the Qujiang fault, but is faulted and extends south through the Qujiang fault. Based on the calculation of the recurrence ability of earthquakes with magnitude 7 or above on the Qujiang fault zone, it is considered that the seismogenic structure of the 1588 Tonghai-Qujiang 7.0 earthquake recorded in history should be the southern extension of the Western Branch of the Xiaojiang fault zone. In addition, according to the intensity-magnitude relationship and the surface rupture length-magnitude relationship, the magnitude of the 1588 Tonghai-Qujiang earthquake is calculated about 6.5, which may be overestimated before. Based on the new investigation results, the active tectonic pattern and future seismic risk at the southern end of Xiaojiang fault zone are further reanalyzed. It is considered that there is a relationship between the southern segment of Xiaojiang fault zone and the Qujiang-Shiping fault zone, which is regarded as a typical structural composite relationship. The intersections of the two groups of faults are often the development parts of tectonic pull-apart basins, forming Gaoda valley, Qujiang basin and Jianshui basin. After reorganizing the historical earthquakes with intensity greater than or equal to Ⅸ, it is found that the north of Jianshui on the Eastern Branch of the southern section of Xiaojiang fault zone is a significant historical seismic gap in this area, so more attention should be paid to earthquake prevention and disaster reduction in the future.
keywords:Xiaojiang fault zone, Qujiang fault, 1588 Tonghai-Qujiang earthquake, Seismogenic fault, active tectonic framework, seismic hazard
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