基于地表流域指数和相关资料综合研究帕隆藏布地区的差异构造隆升  

Differential Tectonic Uplifting in the Palongzangbu Region based on Watershed Index and Relevant Data

作　　者：赵妍[1] 王林[1] 田勤俭[1] 李文巧[1] 徐岳仁[1] ZHAO Yan WANG Lin TIAN Qin-jian LI Wen-qiao XU Yue-ren(Key Laboratory of Earthquake Prediction, Institute of Earthquake Science, CEA, 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》2017年第3期38-50,共13页Earthquake

基　　金：基金项目:雅鲁藏布江下游地区区域构造稳定性研究(A404HX-2015-003)

摘　　要：帕隆藏布地区差异隆升的研究对于东构造结地区构造变形机制的理解以及断块模型的建立具有重要的科学意义。本文基于GIS平台,利用ASTER-30m的DEM数据,计算了帕隆藏布地区19个流域地貌单元的面积-高程积分指数(HI),并结合地震资料、地表沉积与侵蚀过程综合研究了该区域的差异隆升。结果表明HI值的空间分布能够反映出研究区的差异隆升。研究区不同地方处于不同程度构造隆升,主要存在着两个相对较强的隆升中心,一个位于东构造结附近,另一个位于嘉黎断裂带、怒江断裂带交汇部位。此外,研究区内流域演化、地震活动以及地表沉积、侵蚀之间紧密关联,共同构成了证据链,揭示了一个完整的"地下构造运动—地表地貌演化"的过程。Study of the differential uplifting in the Palongzangbu region is crucial to understanding tectonic deformation mechanism and establishing faulted blocks model in the east structural knot. Based on GIS, we used the ASTER-30 m DEM to calculate the hypsometry index （HI） of 19 watersheds in the Palongzangbu region, and studied the differential uplifting in this region combining seismic data, ground deposition and erosion process. The results show that the spatial distribution of HI values can reflect the differential uplifting in the study area. Differential tectonic uplifting lies in different zones, and there are two relative strong uplifting centers. One center is near the east structural knot, another center lies at the intersection between the Jiali fault and Nujiang fault. Moreover, the watershed evolution is closely related to seismic activity, ground deposition and erosion process, which constitutes the evidence chain to reveal the whole process from the underground tectonic movement to the landform evolution on the surface.

关 键 词：差异构造隆升 面积高程积分 GIS DEM 东构造结 

分 类 号：P315.7[天文地球—地震学]