Information Integration And Analysis Of Active Faults In Yunnan Province

Yunnan is located in the southeastern margin of the collision zone between Indianplate and Eurasian plate. Since Cenozoic time, with the affection of eastward motionof the Tibetan plateau, it experienced severe tectonic deformation and intense faultactivities in this region. According to the relevant statistics, more than90%of theearthquake in the world is caused by tectonic activity（Sheng jian,2008）, mainly dueto the fault rupture. It is one of the sound places to study active faults, with majorearthquakes hitting this area in resent years. It is necessary to study and establish asystem of active faults. In the study of active faults, traditional field geological workis time-consuming and laborious, while remote sensing technology provides guidanceto extract active faults, which is more accurate and faster. This paper selects Yunnanregion as the research area by using remote sensing images, DEM data and GIStechnology. Combining the previous1:20(25)0000regional geological survey results,it discuses the distribution and property of the active faults, and establishes an activefaults system in this area.This paper summarizes the research progress of active faults at home and abroadthrough the collection of1:20(25)0000regional geological survey results, journalarticles and reports and other relevant information, and extracts the active faultinformation which is clearly described in the articles and reports.ETM image data of Yunnan region is collected and processed. Through analysis,ETM743band is selected for color composite among lots of methods of imageenhancement to fully display the morphological characteristics of the surface featuresand fault information. According to the fault interpretation signs, active faults in the1:20(25)0000geological report are extracted, and to summarize the active faultinterpretation signs in this region by analyzing the characteristics of the imagefeatures. During the re-collation of active faults in the1:20(25)0000geological report,new interpreted active faults are added to the system.With the1:50000DEM data in this area, the image of mountain shadow isextracted by ArcGIS, which highlights the linear texture of the image. According to the morphological characteristics of the extracted active faults, kinematic direction ofthe active faults can be determined.By integrating the three sources of data, this study extracts307active faults in all,which mainly contains five groups of SN、NE、NNE、NW and NNW trending, andestablishes active faults system of this area. It mainly contains active faults extractedfrom1:20(25)0000geological report, interpreted by remote sensing images and DEMdata. Besides, it contains secondary database of1:750000Yunnan tectonic systemmap and earthquake epicenter distribution map. This study classifies structure zonesand analyzes the characteristics of active faults and regional tectonic stress field inthis area, providing a theoretical basis for earthquake disaster prevention, nationalmajor project planning and decision making.