Analysis on the Key Controlling Factors of Geo-Hazards Triggered by Five Typical Earthquake Events in China
详细信息
- 责任者：Yin Zhiqiang (China Institute of Geo-Environment Monitoring ; Beijing 100081 ; China) ; Chen Hongqi
- 刊名：Earth Science Frontiers
- 出版年：2013
- 卷期：20(6)
- 关键词：地震效应 ; seismic effects ; 震灾 ; seismic hazard
- 页码：p.289-302
- 图表：9 illus., 2 tables, 43 refs.
- 分类号：1800
- issnNo：ISSN1005-2321
- isbnNo：CN11-3370/P
摘要
On the basis of surveying and mapping of some typical geo-hazards induced by Wenchuan,Lushan,Yushu,Minxian,and Yiliang earthquakes that happened in western China since 2008,the key controlling factors of geo-hazards induced by earthquake are studied in the paper.Some main conclusions are as follows:(1)the spatial distribution of geo-hazards induced by earthquake was mainly controlled by four factors,i.e.,the active nature of the seismogenic fault,the peak ground acceleration(PGA),the geomorphological slope and elevation of the seismic area,and the distance from the seismogenic faults and rivers.The geo-hazards induced by earthquake were distributed along the fault and exhibited in the shape of bands;the impact of high-speed remote landslides occurring on a high position with mass volume was more severe;(2)the greater magnitude of earthquake,the steeper geomorphological slope,and the heavily broken and weathering strata will more probably cause severe geo-hazards,such as the Wenchuan earthquake area;(3)there is no inevitable relationship between the spatial distribution characteristics and the level of seismic intensity.Some mountains and canyons are often hazard-prone areas because of the highly geomorphological enlarger effects.Therefore,the forming patterns and mechanisms of geo-hazards induced by earthquake were fully utilized in the survey of the geo-hazards after earthquake,and the epicenter and high intensity seismic zones are not often necessarily the hazard-prone areas.The results of this paper may be used to predict the spatial distribution areas of geo-hazards induced by earthquake,and provide some technical supports for emergency response.
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