摘要
基于2022年9月5日泸定M_(S)6.8地震的野外调查,结合遥感解译结果,总结了泸定地震同震地质灾害的发育特征和主控因素,研判了同震地质灾害的演化趋势,并针对同震地质灾害防灾减灾的不同阶段给出了相应的建议。结果显示:泸定地震同震地质灾害整体以小-中型崩塌、滑坡为主,集中分布在磨西镇和海螺沟、得妥镇湾东村、得妥镇大渡河沿岸三个区域;主震和余震、鲜水河活动断裂、地形地貌、特殊岩土体是泸定地震同震崩滑空间分布的主控因素;泸定地震震后地质灾害在未来十年内会极为活跃,需要密切关注磨西河和支沟、大渡河河谷两侧的高陡岸坡、大渡河高阶地、磨西台地边缘区域以及磨西镇、得妥镇同震崩滑密集发育的泥石流沟谷。根据同震地质灾害应急防范的管理逻辑,建议地方政府按照过渡性安置详查阶段、恢复重建阶段、长远规划阶段三个阶段来针对性地开展地质灾害的防灾减灾工作。
Based on the field investigation of the Luding M_(S)6.8earthquake occurred on September 5,2022,combined with the remote sensing interpretation,the development characteristics and controlling factors of coseismic geohazards triggered by the Luding earthquake are summarized,and the evolution trend of coseismic geohazards is studied and judged.According to the different phases of prevention and mitigation of coseismic geohazards,corresponding suggestions are given in order to benefit the prevention and control of geohazards.The results show that the coseismic geohazards of the Luding earthquake are mainly small-medium-sized collapses and landslides,which are concentratedly distributed in three areas:Moxi town and Hailuogou valley,Wandong village of Detuo town and both banks of Daduhe river in Detuo town.Mainshock and aftershocks,Xianshuihe active fault,topography,special rock and sediment mass are the main controlling factors for spatial distribution of coseismic landslides triggered by the Luding earthquake.The geohazards after Luding earthquake will be extremely active in the next 10 years.It is necessary to pay close attention to the high-locality and steep slopes on both banks of the Moxihe river and its tributaries,the Daduhe river,the high-locality terrace along the Daduhe river,the edge area around the Moxi platform,and the debris flows in Moxi town and Detuo town where coseismic landslides are densely developed.Therefore,according to the management logic of emergency prevention of coseismic geohazards,it is suggested that local governments should follow the three phases of detailed investigation,restoration and reconstruction,and long-term planning to carry out geohazard prevention and mitigation work.
作者
张佳佳
陈龙
李元灵
刘民生
石胜伟
易靖松
张文
张世林
孙金辉
杨栋
鲜杰良
蔡佳君
Zhang Jiajia;Chen Long;Li Yuanling;Liu Minsheng;Shi Shengwei;Yi Jingsong;Zhang Wen;Zhang Shilin;Sun Jinhui;Yang Dong;Xian Jieliang;Cai Jiajun(Institute of Exploration Technology,Chinese Academy of Geological Sciences,Chengdu 611734,China;Technology Innovation Center for Risk Prevention and Mitigation of Geohazard,Ministry of Natural Resources,Chengdu 611734,China)
出处
《地震学报》
CSCD
北大核心
2023年第2期167-178,共12页
Acta Seismologica Sinica
基金
中国地质调查局地质调查项目(DD20221741,DD20221630)
第二次青藏高原综合科学考察研究项目(2019QZKK0902)
自然资源部深地动力学重点实验室自主(开放)研究课题(J1901)
国家自然科学基金(42230312,42020104007)联合资助。
关键词
2022年泸定地震
同震地质灾害
主控因素
演化趋势
防灾减灾建议
鲜水河断裂
Luding earthquake in 2022
coseismic geohazards
controlling factors
evolution trend
suggestions of geohazard prevention and reduction
Xianshuihe fault