Types and their characteristics of geological hazards triggered by “6·17” earthquake in Changning, Sichuan Province
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摘要:
为研究四川长宁“6·17”地震烈度与震后地质灾害发育之间的关系，笔者将研究区地震前后地质灾害排查结果进行对比分析、统计梳理。本文在宜宾市3区7县地震前后地质灾害调查成果的基础上，结合四川省地震局发布的地震烈度图以及新闻稿件，经梳理统计分析，得出不同地震烈度区内震后地质灾害的发育与分布特征、地震前后地质灾害变化规律如下：①宜宾长宁“6·17”地震震级6.0级，级数不大，但是诱发的地质灾害种类较多；②新增地质灾害隐患点以震中长宁县双河镇为中心，集中于高烈度区，且高烈度区地质灾害发育密度远大于低烈度区。③高烈度区地灾隐患点有成倍增加的趋势，中烈度区增幅不明显，低烈度区无变化。对处于多发地震区的四川省，尤其是川南片区震后应急救灾、地质灾害形势预测、建设规划、地质灾害防治等方面有一定的参考意义。
Abstract:The epicenter of the Ms6.0 earthquake occurred near Shuanghe Town in the southeast of Changning County, Yibin, Sichuan Province On June 17, 2019 is with the intensity of VIII degree. Immediately after the earthquake, field investigation of geological disasters were conducted, and it was found that Changning County and Gongxian County were greatly affected by the earthquake, while other districts and counties were slightly impacted. Based on the survey before and after the earthquake in three districts and seven counties in Yibin City, combined with the seismic intensity map and news articles issued by Sichuan Provincial Seismological Bureau, the development and distribution characteristics of post earthquake geological disasters in different seismic intensity areas, are as follows: ① The magnitude of the “6·17” earthquake in Changning, Yibin is 6.0, and the order of magnitude is 6.0. But there are many kinds of geological disasters. ②New geological hazards mainly distributed in Shuanghe Town, Changning County. The density of geological hazards in high intensity area is much larger than that in low intensity area. ③ The potential disaster points increased in high intensity areas, but slightly increase in medium intensity areas and had no change in low intensity areas. The conclusion of this paper could be reference for Sichuan Province, especially for the emergency relief, construction planning and geological disaster prevention and control.
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