Identification and analysis of secondary geological hazards triggered by a magnitude 8.0 Wenchuan Earthquake
Identification and analysis of secondary geological hazards triggered by a magnitude 8.0 Wenchuan Earthquake
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发表时间：
2009
影响因子：
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通讯作者：
Xu Chong;D. Fu-chu;Chen Jian;Tu Xin-bin;X. Ling;Li Wei-chao;Tian Wei;Cao Yan-bo;Y. Xin-Y.-Xi
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作者：
Xu Chong;D. Fu-chu;Chen Jian;Tu Xin-bin;X. Ling;Li Wei-chao;Tian Wei;Cao Yan-bo;Y. Xin-Y.-Xi
四川汶川8.0级地震引发落石、滑坡、泥石流等大量次生地质灾害。获得整体遥感数据后，对重灾区14个县多源遥感数据进行目视解译，识别出约46560处次生地质灾害。他们的位置和面积信息被输入GIS数据库。绘制了14个县的次生地质灾害分布图、点命运图、个数直方图、总面积、平均面积、面积比、频率等。确定了4个地质灾害密集区。结果表明，次生地质灾害分布与主要断裂之间存在对应关系。最后建立了地震地质灾害分布与高程、坡角、烈度的关系。研究区约54.00%的次生地质灾害发生在海拔1000m~2000m之间；次生地质灾害约62.42%发生在坡度30°～50°之间；次生地质灾害90.94%发生在Ⅺ至Ⅷ烈度之间。本文为汶川地震次生地质灾害的发展趋势、机制、预测、恢复重建、选址等进一步研究提供重要的数据库。
Large quantities of secondary geological hazards such as rock falls, landslide as well as debris flows were triggered by a magnitude 8.0 earthquake of Wenchuan, Sichuan, China. The identification of about 46560 secondary geological hazards through visual interpretation of multi-source remote sensing data over 14 counties in heavy disaster region after the overall remote sensing data were obtained. Their location and area information was input into GIS database. The distribution map, dot destiny map, histogram of number, total area, average area, area ratio, frequency of secondary geological hazards in 14 counties were drawn. Four regions of intensive geological hazards were identified. It is shown that there is a corresponding relation between the distribution of secondary geological hazards and the main faults. At last, the relation between the distribution and elevation, slope angle and intensity of earthquake triggered geological hazards were established. About 54.00 percent of secondary geological hazards in the study area occurred between altitude of 1000m and 2000m; about 62.42 percents of secondary geo- logical hazards occurred between slope angle of 30° and 50°; about 90.94 percents of secondary geological hazards occurred between Ⅺ and Ⅷ intensity. This paper provides an important database of secondary geological hazards triggered by Wenchuan Earthquake for further research on development trend, mechanism, prediction of secondary geological hazards, restoration and rebuilding, site selection, etc.