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Title:: Faults in the Reservoir Area of Jinghong,Yunnan,Hydropower Station and the Risk of Reservoir-induced Seismicity

作者:: 李志祥¹; 2; 毛玉平²; 谢建斌³; 肖海滨³; 李茂仙²; (1.中国科学技术大学地球和空间科学学院,合肥 230026; 2.云南省地震局,昆明 650224; 3.云南华能澜沧江水电有限公司,昆明 650214)

Author(s):: LI ZHI-xiang¹; 2; MAO Yu-ping²; XIE Jian-bin³; XIAO Hai-bin³; LI Mao-xian²; (1.School of Earth and Space Sciences,University of Science and Technology of China,Hefei 230026,China)(2.Earthquake Administration of Yunnan Province,Kunming 650224,Yunnan,China)(3.Yunnan Lancang River Hydropower Development Co.,LTD,Kunming 650224,Yunnan,China)

Keywords:: Jinghong hydropower station; reservoir-induced earthquake; fault feature; Yunnan

摘要:: 通过对景洪电站水库周围区域地震地质环境,包括主要活动断裂、库区周围地震活动、库区断层性质及其与水库关系的分析,认为景洪电站水库地震地质环境复杂,水库周围地区不仅发育有澜沧江断裂带、澜沧—勐遮断裂带、无量山断裂带等规模较大的活动断裂,而且位于耿马—澜沧地震带、思茅—普洱地震带之间; 库区发育一系列NW向断层,主要包括澜沧江断裂、酒房断裂、白马山断裂、打洛断裂、勐养河断裂、大水缸—茨通断裂、安马山断裂、三达山断裂、育种队断裂等,这些断层形成一条以水库为中心的10～20 km宽的NW向断层带。因此,景洪电站水库具备发生水库诱发地震的基本条件,发生水库诱发地震危险性较大的是澜沧江断裂近坝址段、安马山断裂南段、白马山断裂。

Abstract:: The seismogeologic environment around Jinghong,Yunnan,Hydropower Station Reservoir,including major active faults,seismicity,faults feature and the relation between them and the reservoir,were comprehensively studied.It is thought that the seismogeologic environment around the Jinghong reservoir is complicated.Because the Lancangjiang,Lancang-Mengzhe and Wuliangshan faults not only develop in the reservoir area,but also lie between Lancang-Gengma Earthquake Belt and Simao-Puer Earthquake Belt.Besides,a series of NW-trending faults,Lancangjiang,Jiufang,Baimashan,Daluo,Mengyanghe,Dashuigang-Citong,Anmashan,Sandashan,Yuzhongdui faults,form a 10-to 20-km-wide NW-trending fault belt in the reservoir area.So the Jinghong reservoir has basic condition of inducing seismicity,and the more dangerous areas are the near-dam segment of the Lancangjiang fault,the south segment of Anmashan fault,and the Baimashan fault.