渭河盆地口镇-关山断裂活动性成因  

Analysis on the Faulting Origin of Kouzhen-Guanshan Fault in Weihe Basin

作　　者：李煜航[1,2] 王庆良[1] 崔笃信[1] 郝明[1] 

机构地区：[1]中国地震局第二监测中心,西安市西影路316号710054 [2]中国地震局地质研究所,北京市华严里甲1号100029

出　　处：《大地测量与地球动力学》2016年第8期669-673,共5页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41174083);陕西省青年科技新星计划(2015KJXX-74);中国地震局地震行业科研专项(201208009)~~

摘　　要：分析了渭河盆地新生代构造及演化特征。结合秦岭北缘断裂的断层分段性研究发现,口镇-关山断裂与秦岭北缘断裂强烈活动的断层段具有很好的空间对应关系。利用有限元模拟研究作为渭河盆地主控断裂的秦岭北缘断裂和华山山前断裂在伸展作用下对口镇-关山断裂和渭河盆地北缘断裂带其他断层的影响。结果显示,口镇-关山断裂的断层活动是秦岭北缘断裂东段作为秦岭北缘断裂中活动性较强的断层段伸展作用的构造响应,同时口镇-关山断裂作为先存构造加剧了上述影响,使其成为渭河北缘断裂带中活动强烈的断层。We analyze the neo-tectonic characteristics and their evolution in the Weihe basin.Based on the faulting segment study of the north Qinling fault,the faulting activity of the Kouzhen-Guanshan fault may correspond to the segment of the north Qinling fault,which has the strongest faulting activity.Then the influence of the Kouzhen-Guanshan fault,including other north margin faults of the Weihe basin,are modelled by FEM,under the condition that the north Qinling and the Huashan front faults are the main and controlling active faults in the Weihe basin.The results show that the faulting activity of the Kouzhen-Guanshan fault corresponds to the east segment of the north Qinling fault.Furthermore,as a preexisting and unsubstantial tectonic belt fault,the Kouzhen-Guanshan fault is easier to aggravate the above-mentioned effect and has stronger faulting activity than other north margin faults of the Weihe basin.

关 键 词：渭河盆地 口镇-关山断裂 断层活动性 有限元模拟 

分 类 号：P315[天文地球—地震学]