基于牛栏江宽谷面的变形讨论莲峰、昭通断裂带第四纪活动特征  

Quaternary Activity Characteristics of the Lianfeng and Zhaotong Fault Zones based on Deformation of the Broad Valley Surfaces of the Niulan River

作　　者：张伟恒 李文巧[1] 田勤俭[1] 徐岳仁[1] 王林[1] ZHANG Wei-heng;LI Wen-qiao;TIAN Qin-jian;XU Yue-ren;WANG(Key Laboratory of Earthquake Prediction,Institute of Earthquake Forecasting China Earthquake Administration,Beijing,100036,China)

机构地区：[1]中国地震局地震预测研究所,地震预测重点实验室,北京100036

出　　处：《地震》2018年第4期22-36,共15页Earthquake

基　　金：中国地震局地震预测研究所基本科研业务项目(2015IES0101,2017IES0101,2016IES0401);科技部国际科技合作项目(2015DFR21100)资助

摘　　要：川滇交界东段NE向莲峰、昭通断裂带受交通、地形等限制,开展区域断裂活动性的调查难度较大,第四纪活动特征的研究程度较低。为了详细认识该断裂带第四纪以来尤其是晚第四纪以来的活动特征,基于Google Earth三维地形数据、GF-1、GF-2高分辨率影像数据,结合野外调查及局部的无人机航拍工作解译出跨断裂的四级牛栏江古宽谷底面,并基于GIS平台,利用ASTER-30m的DEM获得牛栏江宽谷面位相图,结合前人对于该区域地貌面年龄的研究及跨断层的牛栏江宽谷面的变形情况得出:莲峰、昭通断裂带现今为一组逆冲活动断裂,第四纪以来断层逆冲活动性昭通—鲁甸断裂最强,莲峰断裂次之,会泽—彝良断裂最弱。Lianfeng and Zhaotong fault zones are located on the border region of eastern Sichuan-Yunnan Province, and it＇s hard to carry out geological and geomorphologic survey for fault activities in this area because of the limitation of poor traffic and complex topography. Therefore, Quaternary activities of those NE-trending faults in this region are poorly studied. In order to acquire more knowledge about the Quaternary activity especially the Late Quaternary activity of these fault zones, we interpreted four level broad valley surfaces of the Niulan River cross the Lianfeng and Zhaotong fault zones based on the Google Earth 3D terrain data, high definition images of GF-1 and GF-2, field investigation and UAV aerial images. Then, based on GIS, we used the ASTER- 30 m DEM to get the lon gitudinal profile of the broad valley surfaces of Niulan River. Finally, combined with previous research on the geomorphic surface age and the deformation of the broad valley surfaces of Niutan River, we drawn several conclusions as follows, since Quaternary, Lian- feng and Zhaotong fault zones are a group of thrusting zones, of which Zhaotong-Ludian fault has the strongest activity, Lianfeng fault is the second, the activity of Huize-Yiliang fault is the weakest.

关 键 词：莲峰 昭通断裂带 牛栏江 宽谷面变形 晚第四纪活动性 

分 类 号：P315.7[天文地球—地震学]