Characteristics of geological hazards and it’s mitigations of the Ms6.8 earthquake in Luding County, Sichuan Province
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摘要: 2022年9月5日四川省泸定县Ms6.8级地震诱发大量次生地质灾害。为深入认识此次地震地质灾害发育分布规律及特征，分析地质灾害发展趋势及潜在风险，文章在现场调查获取的一手资料，结合震区首轮地质灾害排查资料、遥感解译和区域地质背景资料综合研究，对地震地质灾害的特征、控灾条件及防灾减灾对策进行了研究。结果表明：截至2022年9月14日22时，地震重灾区泸定县和石棉县境内共诱发有威胁对象的地质灾害隐患点565处，包括崩塌331处、滑坡234处，导致81处已有地质灾害隐患点加剧变形；地震诱发的地质灾害类型主要以中、小型群发性高位崩塌和滑坡为主，主要集中分布在震中附近地震烈度Ⅸ度区域，包括泸定县磨西镇、得妥乡、得妥乡—德威镇段大渡河两岸及石棉县草科乡、王岗坪乡；位于地震烈度Ⅸ度区内的湾东河等流域，根据汶川地震经验认为，在未来5年内泥石流将处于活跃期，泥石流防治工程设计需考虑其高频率、黏性泥石流等特征；得妥乡—德威镇段大渡河两岸残留在坡面的崩滑体在降雨作用下易转化成坡面泥石流，建议在防治工程设计时要充分考虑两种灾害类型的转化形式。研究可为震区地震地质灾害防范及灾后重建规划提供科学参考。
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关键词:
- 泸定县Ms6.8级地震 /
- 地震地质灾害发育规律 /
- 控灾条件 /
- 演化趋势 /
- 减灾对策
Abstract: On 5th September, 2022, the Ms 6.8 earthquake in Luding County, Sichuan Province induced large numbers of geological hazards. To deeply understands the evolution, distribution, and characteristics of geological hazards caused by the earthquake, we got the distribution of geological hazards by the field investigation and remote sensing interpretation. Then we analyzed the conditions for hazard control and the countermeasures for hazard prevention and reduction. The results show that as of 22:00 on September 14, 2022, the earthquake has induced 565 geological hazards with threat objects in Luding County and Shimian County (including 331 collapses and 234 landslides), and there were 81 existing geological hazards became more deformed. The types of geological hazards induced by the earthquake are mainly medium and small mass high-level collapses, which are mainly concentrated in the areas with Seismic intensity zone ofⅨ near the epicenter. These areas include Moxi Town, Detuo Township, both banks of Dadu River between Detuo Township and Dewei town in Luding County, Caoke Township and wanggangping Township in Shimian County. According to the experience of the Wenchuan earthquake, the debris flow will be active in the next five years, and its characteristics of high frequency and viscous debris flow should be considered in the design of debris flow prevention and control engineering. Under the rainfall condition, the landslide deposition remaining on the slopes of Dadu River banks in the section of Detuo Township Dewei town can be easily transformed into debris flow. It is suggested that the transformation forms of the two hazards’ types should be fully considered in the design of prevention and control projects. The study can provide a reference for earthquake geological hazard prevention and post hazard reconstruction planning in the earthquake area. -
图 2 研究区震前地质灾害分布图
Figure 2. Distribution of geological disasters before earthquakes in the study area
图 3 震区震前地质灾害点与地震烈度统计图
Figure 3. Statistical map of geological hazard points and seismic intensity before the earthquake in the study area.
图 4 研究区地震新增地质灾害分布图
Figure 4. Distribution map of new seismic geological disasters in the study area.
图 5 震区典型地质灾害发育特征
Figure 5. Characteristics of typical geological hazards in seismic area.
图 6 大岗山水电站至王岗坪乡区域地震前后地质灾害发育情况对比图
注：（a）中地质灾害解译分布图来源于四川省地质调查院，数据由四川测绘地理信息局提供，分辨率0.2 m，航摄时间20220909；（b）中影像数据为资源三号卫星影像，分辨率2 m，拍摄时间20210210。
Figure 6. Comparison of geological hazards’ distribution in the area from Dagangshan hydropower station to Wanggangping Town before and after the earthquake.
图 7 研究区地震InSAR形变场（四川省地质调查院提供）
Figure 7. Seismic InSAR deformation field in the study area （provided by Sichuan Geological Survey）
表 1 震区震前地质灾害点统计表
Table 1. Statistics of geological hazard points before the earthquake in the study area.
市（州） 县（地级市） 滑坡/处 泥石流/处 崩塌/处 合计/处 甘孜州 泸定县 160 124 59 343 1170 康定市 51 79 41 171 九龙县 143 186 48 377 雅江县 176 72 31 279 雅安市 石棉县 31 65 6 102 316 天全县 33 0 3 36 荥经县 40 7 4 51 汉源县 109 9 9 127 凉山州 甘洛县 83 32 26 141 311 冕宁县 61 103 6 170 
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表 2 震区震前和震后地质灾害点与地震烈度统计表
Table 2. Statistics of geological hazard points and seismic intensity before and after the earthquake in the earthquake area
不同烈度区 震后新增地质灾害/处 崩塌 滑坡 泥石流 合计 Ⅵ 24 11 0 35* Ⅶ 66 30 2 98* Ⅷ 60 72 6 138 Ⅸ 171 121 2 294 注：*表明仅统计Ⅵ度和Ⅶ度部分范围内的新增地震灾害点。
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