西秦岭北缘断裂带西端晚第四纪活动特征及其西延问题  

Late Quaternary Activities of the West Segment of Northern Margin of Western Qinling Fault Zone and its Western Extension

作　　者：张波[1,2] 何文贵[1,2] 袁道阳[1,2] 刘白云[1,2] 刘兴旺[1,2] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局地震预测研究所兰州科技创新基地,甘肃兰州730000

出　　处：《地震》2012年第1期136-143,共8页Earthquake

基　　金：国家自然科学基金(40872132);中国地震局中国大陆7级以上大震危险区预测项目共同资助

摘　　要：西秦岭北缘断裂是青藏高原东北缘的一条以左旋走滑运动为主的大型活动断裂。通过卫片解译和野外地质调查,认为断裂西端活动性仍很强烈,并发现切龙沟一带全新世活动特征明显。结果表明,全新世以来西秦岭北缘断裂西端至少有2次古地震事件,说明断裂经过土房村以后活动并没有停止,而是继续向西延伸,最后终止于甘加盆地。The northern margin of Western Qinling fault zone （NWQF） is one of the main left-lateral strike slip active faults in northeastern margin of Tibetan Plateau. Through field seismic and geological investigations, we opined that the west segment of this fault remain actively strong. Significant Holocene activity characteristics are found in Qielonggou. Trenches show that at least two Holocene paleoseismic events happened in wes＇t segment of NWQF, which shows that fault activities of NWQF still exist in the west of Tufang village, extend westward from Tufang village continually and finally terminate at the Ganjia basin.

关 键 词：西秦岭北缘西端断裂 断裂活动性 古地震事件 甘加盆地 

分 类 号：P315[天文地球—地震学]