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Geomorphic characteristics of segmental activities of the Longmenshan fault zone since late Cenozoic |
| ZHANG Wei1, YAO Qi2, YANG Jinzhong1, YU Hao3, WU Jianyong4 |
1. China Aero Geophysical Survey and Remote Sensing Center for Land and Resources, Beijing 100083, China;
2. China Earthquake Networks Center, Beijing 100045, China;
3. Information Center of Xinjiang Bureau of Geology and Mineral Resources Exploration and Development, Urumqi 830000, China;
4. Zhejiang Institute of Geology and Mineral Resources, Hangzhou 310012, China |
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Abstract The segmental activity of the Longmenshan fault belt resulted in the difference in uplift of its neighboring areas. In this paper, the authors used SRTM(shuttle radar topography mission) digital elevation model(DEM) to analyze the topography,local relief and slope of the Longmenshan fault zone and its adjacent areas. The topography of the study area basically maintains the tendency of decreasing elevation from south to north which was caused by strong tectonic movements in Pliocene-early Pleistocene period. However,the local relief shows obvious characteristics of segmentation. The borders of these segments coincide with the segment border of the Longmenshan fault belt. The geomorphic feature along the northern section of the Longmenshan fault zone is mainly controlled by river erosion,whereas the local relief beside the Qingchuan fault is greatly impacted by tectonic movements. The local relief of the middle section is obviously controlled by the latest tectonic movements. However,in the southern section,the latest tectonic movements only control the area near the Xianshuihe fault. In addition,the local relief along the surface rupture zone of 2008 Wenchuan earthquake is consistent with the surface co-seismic displacement segmentation and regional deformation field. These data indicate that the tectonic movements since late Cenozoic are still reshaping the geographic and geomorphic characteristics nowadays.
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| Keywords
alpine grassland
crude protein
monitoring model
HJ-1A/1B
biomass
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Issue Date: 21 October 2013
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2013,
Vol. 25
