• 首页
  • 学报简介
  • 编委会
  • 投稿指南
  • 订阅指南
  • 过刊浏览
  • 在线投稿
  • 联系我们
  • 网络预出版
  • English

本文将参加年度优秀论文评选,如果您觉得这篇文章很好,请投下您宝贵的一票,谢谢! 支持(0)   不支持(0)

川西理塘断裂带奔戈-村戈段古地震事件及其非均匀性活动特征
投稿时间:2019-04-09  修订日期:2019-09-12  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020025
摘要点击次数: 274
全文下载次数: 104
作者单位E-mail
张克旗 中国地质科学院地质力学研究所 zhkeqi@163.com 
吴中海 中国地质科学院地质力学研究所 wuzhonghai@geomech.ac.cn 
周春景 中国地质科学院地质力学研究所  
田婷婷 中国地质科学院地质力学研究所  
李跃华 中国地质大学 北京  
李家存 首都师范大学  
基金项目:中国地质调查局项目( 1212011120163,12120114002101, DD20160268)
中文摘要:在对青藏高原东南缘地区的理塘左旋走滑活动断裂带野外调查研究中,在其奔戈-村戈段开挖了两个探槽LT1301和SLT1204。在对两个探槽上所揭示出的古地震事件进行详细划分的基础上,结合所获得的10个OSL年代样品和13个14C年代样品的测试年龄,对理塘断裂带北段的古地震事件发生时代进行了厘定。结果表明2个探槽共揭示出至少4次古地震事件,其中小规模的探槽LT1301仅揭示出1次古地震,可能为发生于公元1729年的历史地震,或是可能发生于距现在950a-1.0ka之间的一次大地震,由于关键部位年代数据不足,上述两种可能性尚无法明确。较大的探槽SLT1204揭示出包含有探槽LT1301中古地震事件在内的古地震4次,最早的古地震事件I发生于9.9ka之前,而事件II、III和IV则发生在公元1729年~4.8kaBP之间,复发间隔为~1.6ka。川西理塘断裂带北段的古地震研究结果表明,该断裂的大地震复发具有非线性特征,不符合特征地震模式,其中全新世晚期的大地震活动频率明显增大,表明它正处于丛集活动阶段。
中文关键词:理塘断裂带 光释光测年 14C测年 古地震事件 特征地震
 
PALEOEARTHQUAKE EVENTS AND INHOMOGENEOUS ACTIVITY CHARACTERISTICS IN THE BENGE-CUNGE SECTION OF LITANG FAULT ZONE IN THE WESTERN SICHUAN PROVINCE
Author NameAffiliationE-mail
zhang keqi Institute of GeomechanicsChinese Academy of Geological Sciences zhkeqi@163.com 
wu zhonghai Institute of GeomechanicsChinese Academy of Geological Sciences wuzhonghai@geomech.ac.cn 
zhou chunjing Institute of GeomechanicsChinese Academy of Geological Sciences  
tian tingting Institute of GeomechanicsChinese Academy of Geological Sciences  
li yuehua China University of Geosciences,Beijing  
li jiacun Capital Normal University  
Abstract:Two trenches LT1301 and SLT1204 were excavated in the Benge-Cunge section of Litang left-lateral strike-slip active fault zone in the southeastern margin of the Qinghai-Tibet Plateau. Based on the detailed division of the paleoearthquake events revealed in the two trenches and the ages of 10 OSL and 13 14C samples obtained, the occurrence ages of paleoearthquake events in the northern part of the Litang fault zone are determined. The results show that the two trenches have revealed at least four paleoearthquakes events. Among them, the small-scale trench LT1301 only reveals one paleoearthquake, which may be a historical earthquake in 1729 A.D. or a major earthquake between 950A and 1.0 ka. The above two possibilities are still uncertain due to insufficient chronological data at key locations. The larger trench SLT1204 reveals four paleoearthquakes including the one in the trench LT1301. The earliest three paleoearthquake event I occurred before 9.9ka. Events II, III and IV occurred between 1729 and 4.8 kaBP with a recurrence interval of 1.6 ka. The paleoearthquakes in the northern part of the Litang fault zone in Western Sichuan indicate that the recurrence of large earthquakes in the fault has non-linear characteristics and does not conform to the characteristic earthquake model. The frequency of large earthquakes in the late Holocene increased significantly, indicating that the fault is in the stage of cluster activity.
keywords:Litang fault zone  OSL dating  14C dating  Paleoseismic events  Characteristic earthquake
查看全文  查看/发表评论  下载PDF阅读器
您是第12903179位访问者  京ICP备05032737号-7  京公网 安备110102004559
版权所有:《地质学报》中文版
主管单位:中国科学技术协会 主办单位:中国地质学会
地  址: 北京市西城区百万庄大街26号 邮编:100037 电话:010-68312410,010-68999025 E-mail: dizhixuebao@163.com
本系统由北京勤云科技发展有限公司设计 

京公网安备 11010202007916号

WeChat