巴颜喀拉块体北东缘主要断裂现今活动性分析

ANALYSIS OF MODERN ACTIVITY OF MAJOR FAULTS IN NORTHEAST MARGIN OF BARYAN-HAR BLOCK

利用GPS数据对巴颜喀拉块体北东缘地壳形变特征及主要断裂现今活动特性进行了研究。速度场结果揭示研究区整体向南东方向顺时针转动,速率自西向东呈逐渐减小趋势。计算获得了研究区主要活动断裂现今活动水平,结果表明迭部-白龙江断裂、光盖头-迭山断裂、西秦岭北缘断裂、虎牙断裂、礼县-罗家堡断裂以左旋走滑运动为主,而青川-平武断裂、茶坝-林庵寺断裂、岷江断裂以右旋走滑运动为主。

From the the northeast s.egment of GPS data,we calculated and derived the modem activity characteristics of major faults in the Baryan Har block. The calculated velocity filed shows that the studied zone rotation clockwise from northwest to southeast, and the rates of the GPS sites decreased from west to east. Besides, we stud- ied the activities of major faults in the studied zone Guanggaitou-Dieshan fault, Xiqinling northern edge motion basically and the Qingchuan-Pingwu fault, strike-slip motion characteristic respectively. from GPS data, the results show that Diebu-Bailongjiang fault, fauh, Huya fault and Lixian-Luojiabao fault are of left lateral Chabalinansi fault, and Minjiang fault show an right lateral