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《Seismology and Geology》 2015-02
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CHARACTERISTICS OF GEOLOGICAL HAZARDS IN YILIANG EARTHQUAKE AND STATISTICAL ANALYSES OF THEIR SPATIAL DISTRIBUTION

FENG Xin-ke;LI Zhi-qiang;LI Xiao-li;WANG Ming-zhen;Institute of Geology,China Earthquake Administration;  
On September 7,2012 at 11: 19 and 12: 16( Beijing time),two catastrophic earthquakes with MS5. 7 and MS5. 6 struck the junction area of Yiliang County,Yunnan Province and Weining County,Guizhou Province, China. The research result indicates that the September 7, 2012 Yiliang earthquake triggered a mass of secondary geological disasters. The spatial distribution of the Yiliang earthquake triggered geological disasters is presented in this paper,by field check and using visual interpretation of remote sensing imageries. The statistical analyses results of their spatial distribution indicate that there are about 213 geological hazards throughout an area of about 0. 67km2,consisting of collapse, landslide, rolling stones and mud-rock flow etc. We analyzed five characteristic parameters of these geological disasters triggered by Yiliang earthquake using GIS spatial analyses,such as seismic intensity,the formation stratum,slope angle,distances to river system and distances to road,and investigated in depth the control effect of these influence factors on the earthquakeinduced geological hazards. This study reveals that: 1) most of the earthquake-induced geological hazards occurred in the Carboniferous strata along the Luoze River; 2) seismic region with intensity Ⅷwithin the study area is the high incidence area of geological disasters,and the geological hazards have positive correlation with seismic intensity; 3) the hazards are mostly distributed in the slope range between 20° ~ 50°; 4) geological disasters are densely distributed in the distance of 500 m to river system and road,and they have negative correlation with the distance.
【Fund】: 中国地震局地震行业科研专项(2013080185)资助
【CateGory Index】: P315.9
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