摘要
地震次生地质灾害指由地震活动引起的地质灾害。地震次生地质灾害,主要为崩塌、滑坡,其次为塌陷、地裂缝、砂土液化等。地震次生地质灾害增强了地震的破坏效应,加剧了地震灾害的损失程度,给抢险救灾和灾后重建造成很大困难。一般震级大于5级、烈度超过6度的地震可能引发不同程度的地质灾害,震级和烈度越高,次生地质灾害越严重。本文根据中国历史地震次生地质灾害的活动程度及发生条件,以地(市、区、盟)为单元,进行了危险性评价:高度和中度危险区主要分布在中国中部的陕甘宁川渝滇藏地区,形成一个大致北北东向的高危险带,其余大部分地区为轻度危险区。
The earthquake secondary geological hazards are referred to those geological hazards due to earthquakes. They can be classified mainly into land collapse and landslide, together with suhsidence, ground fissure and sand liquefaction, etc. The destructive effect and damage level of earthquakes could be exacerbated by the secondary geological hazards, which poses great difficulty, in turn, for the rescue and relief work, and the post-disaster reconstruction. Generally, earthquakes with magnitude over 5.0 and intensity beyond Ⅵ would result in geological hazards at certain degrees, the higher the magnitude and the intensity were, the more serious would be the secondary geological hazards. Based on the conditions and serious extents of the earthquake secondary geological hazards in history, the risk levels have been assessed in this paper at prefectural （city, region, union） units： The areas with high and moderate levels of risk are mainly distributed in the region of Shanxi-Gansu-Ningxia-Sichuan-Chongqing-Yunnan-Tibet, being located in the central part of China and forming a nearly NNE-striking zone of high risk levels, and the most of other areas are of low levels of risk.
出处
《防灾减灾工程学报》
CSCD
2009年第3期356-360,共5页
Journal of Disaster Prevention and Mitigation Engineering
基金
中国地震减灾区划与分区应急对策项目(2003DIBJ125)
关键词
地震
次生地质灾害
分布特征
危险性区划
earthquake
secondary geological hazards
characteristic distribution
hazard regionalization
