摘要
依据１ ：５０ ０００ 地质填图资料，对天桥沟—黄羊川活动断裂带晚更新世以来的几何学和运动学特征进行了详细的论述．认为该断裂带可分为逆走滑（ 左旋） 的天桥沟断裂段和正走滑（ 左旋） 的黄羊川断裂段，其主要活动时期是晚更新世，滑动速率为４ ～５ ｍ ｍ／ａ ．全新世早期，该断裂带活动强度逐渐减弱，其最后一次活动的时间为距今０ ．７５９ ×１０４ ～１ ．０２ ×１０４
According to data of field geological investigation,geometry and kinematics characteristics of Tianqiaogou-Huangyangchuan active fault zone since later Pleistocene are described in detail.The fault zone may be divided into Tianqiaogou segment showing inverse left lateral strike slip nature and Huangyangchuan segment showing normal left lateral strike slip nature.Main active period of the fault zone is Pleistocene and its slip rate is 4～5 mm/a.In early Holocene,its active strength gradually became low,and the latest palaeoearthquake on the fault occurred 0.759×10 4～1.02×10 4 years ago.
出处
《西北地震学报》
CSCD
1999年第3期259-267,共9页
Northwestern Seismological Journal
基金
国家地震局"八五"重点资助项目
关键词
甘肃
活动断裂带
走滑断层
几何学
运动学
Gansu
Active fault zone
Strike slip fault
Tianqiaogou-Huangyangchuan active fault zone
Fault segmentation
Slip rate
