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| Spatial distribution of rockfall and landslide mass in disaster areas of Wenchuan earthquake |
| Li Zhiguang1,Zeng Hongjuan2 |
| 1.The Monitoring Center of Soil and Water Conservation,Ministry of Water Resources,100053;2.State Key Laboratory of Remote Sensing Science,School of Geography,Laboratory of Environmental Remote Sensing and Digital City,Beijing Normal University,100875:Beijing,China |
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Abstract Taking Beijing-1 remote sensing image as basic material,this paper distills the spatial distribution information of landslide and rockfall mass in disaster areas of Wenchuan earthquake.Utilizing buffer analysis as main technique.We analyze the indicators of landslide and rockfall mass including area,number,volume,size and distribution density in different distant buffers of the aftershock centralized belt,as well as the epicenters upwards 5th grade,and obtain the spatial relationship between them.The result shows,among the different distance buffers of the aftershock centralized belt,the area of landslide and rockfall mass in 10-30 km section is the largest,while the largest number,volume and distribution density appear in 5 km buffer.Among the buffers of the epicenters upwards 5th grade,the area and number of landslide and rockfall mass in 10-30 km section are the largest,while the largest distribution density appears in 5 km buffer.The 30 km buffer is the high frequency region of landslide and rockfall mass,the area of this region only occupies 10% of the research area,but landslide and rockfall mass reaches 60% of the total area,about above 80% of the total number and volume of landslide and rockfall mass.The number of landslide and rockfall mass whose area is from 1 hm2 to 5 hm2 is the most in each buffer,then is the area less than 1 hm2.
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Received: 20 November 2008
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