GEOMORPHIC CHARACTERISTICS AND FAULT RESTRICTION IN THE TENGCHONG VOLCANIC REGION——-INTERPRETATION BASED ON DEM AND TM DATA

doi:10.3969/j.issn.0253-4967.2012.04.018

Abstract

Abstract:

Based on WorldView-2 high-resolution satellite image and ASTER GDEM(V1)digital elevation model(DEM)data,the authors studied geomorphological characteristics of the Tengchong volcanic region by means of remote-sensing interpretation,topography-elevation analysis,surficial-slope analysis and terrain-section analysis,with ArcGis and Global Mapper. According to the results of the study,the Tengchong volcanic region has several kinds of geomorphic units which possess corresponding interpretation keys in satellite image,and the latest typical volcanic geomorphic unit can be divided into four categories. Topography-elevation and surficial-slope analysis show that there is obvious difference in surface relief of geomorphic units in the horizontal direction and the geomorphic surface can be vertically divided into four classes. Geographically,the terrain elevation of the basin is higher in west and centre than in east,north and south,which associates with the original landform,tectonic evolution and volcano-magmatic activities. The NS-trending tectonic belts in the study zone controlled the eruption and distribution of the volcanoes. Early pyroclastic volcanoes,such as Daliuchong and Xiaoliuchong,had strong eruption power and shaped towering mountains which cover the middle part of the basin,while the lava-type volcanoes,such as Heikongshan,Dakongshan and Maanshan,with a decreased eruption power,erupted mainly in the form of overflowing lava. On the whole,the structure and evolution of the basin directly controlled and restricted the volcanic activities. At the meantime,the volcanic process transformed the geographic and geomorphic conditions of the basin and shaped the modern volcanic landscape features.

Key words: WorldView-2 satellite image, DEM, geomorphic feature, Tengchong volcanic region

摘要：

基于WorldView-2高分辨率遥感卫星影像及ASTER GDEM(V1)数字高程模型(DEM)数据,以ArcGIS和Global Mapper软件为平台,通过影像解译、地形高程、地表坡度及地形剖面等分析手段,对腾冲火山区火山地形地貌特征进行综合分析。研究表明,腾冲火山区存在多种地貌单元,文中根据不同地貌单元的影像特征,建立相应的遥感解译标志,并将区内新期喷发的、典型的火山地貌单元划分为4个类别。地表坡度及地形剖面分析显示,腾冲火山区地貌单元横向上地表起伏差异明显、坡度变化特征不一,纵向上存在明显分层,大致划分为4级地貌面,地形高程上呈现西高东低,中部高、南北低的特征,这主要与原始地貌、盆地构造演化及后期火山岩浆活动相关。区内SN向构造带为主的构造格局制约着火山的喷发展布特征,早期喷发的大六冲、小六冲等碎屑岩类火山,喷发动力极强,形成高耸山体,居于盆地中部,后期喷发的黑空山、大空山、马鞍山等熔岩类火山,喷发动力减弱,岩浆溢流为主,形成广阔的熔岩台地。盆地的演化及构造发育直接影响和制约火山活动的强弱,火山活动又进一步改造了盆地的地形地貌,形成了腾冲火山区现今的火山地貌特征。

关键词: 卫星影像, DEM, 地貌特征, 腾冲火山区

CLC Number:

P317.2

ZHANG Liu-yi, LI Ni, ZHAO Yong-wei, CAO Yuan-yuan, GONG Li-wen. GEOMORPHIC CHARACTERISTICS AND FAULT RESTRICTION IN THE TENGCHONG VOLCANIC REGION——-INTERPRETATION BASED ON DEM AND TM DATA[J]. SEISMOLOGY AND GEOLOGY, 2012, (4): 755-767.

张柳毅, 李霓, 赵勇伟, 曹园园, 龚丽文. 腾冲火山区地形地貌特征及断裂制约关系——卫片与DEM解译的认识[J]. 地震地质, 2012, (4): 755-767.

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