荥经—马边—盐津地震构造带中北段构造特征分析

Structural Characteristics Analysis of the Middle and North Section of Yingjing-Mabian-Yanjin Seismic Structural Belt

荥经—马边—盐津地震构造带位于青藏高原东缘边界地带,其南段地震活动较频繁,曾发生过多次强震、大震,受到广泛关注,而中北段的研究程度较低,在一定程度上影响了对该区域的发震能力评估。本项研究通过详细的野外地质调查,查明了该带中北段的断裂构造特征,结果表明北西走向的断层以逆冲运动为主,未见明显的晚第四纪活动特征。

Yingjing-Mabian-Yanjin seismic structural belt is located in the eastern border area of the Qinghai-Tibet Plateau.The southern segment of the belt has frequent seismic activities,and there have been many strong and large earthquakes,which have been widely concerned.However,the research level of the middle and north segments is relatively low,which to a certain extent affects the evaluation of the seismic energy in this region.Through the detailed field geological survey,the fault structural characteristics of the middle and north part of the belt are found out.The results show that the NW trending fault is dominated by thrust movement,and there is no obvious activity characteristics of late quaternary.