玉树断裂活动性研究  

RESEARCH ON ACTIVITY OF YUSHU FAULT

作　　者：李闽峰[1] 邢成起[1] 蔡长星 国文秀[1] 邬树学[1] 袁著忠 孟勇琦[1] 涂德龙[1] 张瑞斌[1] 周荣军[1] 

机构地区：[1]国家地震局地质研究所,国家地震局兰州地震研究所,四川省地震局,青海省地震局

出　　处：《地震地质》1995年第3期218-224,共7页Seismology and Geology

摘　　要：通过实地考察和室内工作，对玉树断裂的活动性进行了分段研究。该断裂划分为３段：（１）西北段全新世以来活动强烈，以水平左旋活动为主，水平滑动速率达７．３ｍｍ／ａ，沿断裂带展布大量的古地震事件遗迹；（２）中段第四纪以来的主体活动时段在晚更新世以前，以正断层活动为主；（３）东南段全新世以来活动强烈，以水平左旋活动为主，水平滑动速率约５ｍｍ／ａ，沿断裂带分布有大量的古地震事件遗迹，历史上记载的最大地震为１８９６年的邓柯７．０级地震。After field investigation and lobaratory study，the Yushu fault can be separeted into threesegments from its activity in this paper. The northwestern segment of Yushu fault has undergonestrong horizontal movement since Q_4． Its maximum horizontal slip rate is 7．3mm／a. Theresome palaeoearthquakes occurred along this segment． The middle segment has been activated inearly Quaternary．The southeastern segment has undergone strong horizontal movement sinceQ_4. Its average horizontal slip rate is 5 mm／a，There many palaeoearthquakes occurred along thissegment．The maximum earthquake with magnitued of 7．0 took place at Dengke in 1896．

关 键 词：断层活动 断层 位移速率 古地震 地震地质 

分 类 号：P315.2[天文地球—地震学]