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地震 ›› 2014, Vol. 34 ›› Issue (3): 117-124.

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云南龙蟠—乔后断裂剑川段古地震初步研究

汤勇, 胡朝忠, 田勤俭, 王林, 杨攀新, 熊仁伟   

  1. 中国地震局地震预测研究所,北京100036
  • 收稿日期:2014-03-03 修回日期:2014-03-19 出版日期:2014-07-31 发布日期:2020-09-08
  • 作者简介:汤勇(1989-),男,湖北荆门人,硕士研究生,主要从事地震构造研究。
  • 基金资助:
    中国地震活断层探查—南北 带中南段(60112304)、国家自然科学基金(41302171)和中国地震局地震预测研究所基本科研业务经费(02132425)资助

A Preliminary Study of Paleo earthquakes in the J ianchuan Section of I ongpan Qiaohou Fault Zone, Yunnan Province

TANG Yong, HU Chao-zhong, TIAN Qin-jian, WANG Lin, YANG Pan-xin   

  1. Institute of earthquake Science, CEA, Bejing 100036, China
  • Received:2014-03-03 Revised:2014-03-19 Online:2014-07-31 Published:2020-09-08

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摘要： 通过遥感影像解译和详细的野外考察,发现龙蟠乔后断裂带剑川段晚第四纪以来长期活动,横跨断裂的水系左旋断错量可分为40 m、140m、550 m、1040m四个等级。经详细考察.后选择后菁拉分盆地开挖探槽。探槽揭示了两次M>6.5古地震事件:一次发生在10010±40aB.P.之前;另一次发生在6130±40a B. P.和6320±40a B.P. 之间。结合前人研究,分析得出剑川盆地全新世以来发生了3次M>6.5的地震,发生时间分别为1751 年、6230士130a B. P.和10737±468aB.P.,其重复间隔约为5300a。由于1751年剑川6¾级地震相对于前两次地震释放的能量偏小,而且其离逝时间较前一次要明显长一些,故本段的地震危险性仍值得关注。

关键词: 古地震, 复发间隔, 龙蟠—乔后断裂带, 剑川段

Abstract: Based on remote sensing interpretation, we found that the Jianchuan section of Longpan-Qiaohou fault zone has been active since late quaternary. The sinistral displace-ments of the rivers across the fault were divided into four grades of 40 m, 140 m, 550 m and 1040 m. T rench study showed that two magnitude>6.5 paleo-seismic events were ex-posed, one of which happened before 10010±40 a B. P.,the other happened between 6130±30 a B. P. and 6130± 30 a B. P.. Combined with previous research results, we conclur ded that three magnitude> 6.5 earthquakes had happened in the Jianchuan basin since Holocene, which happened respectively at 1751,6230±130 a B.P. and 10737± 468 a B. P.,the recurrence interval was about 5300 a. As the energy release of 1751 Jianchuan 6¾ earthquake is smaller than the first two and elapsed time is much longer, the seismic haz ard of Jianchuan section is worthy of attention.

Key words: Magnitude>6.5 paleo-earthquake, Recurrence interval, Jianchuan section, Longpan-Qiaohou fault zone

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