摘要
由于蓄水的影响,三峡水库地震活动大幅增加,以三峡库区2000年至今的地震活动为基础,分析了水位变化速率对地震活动的影响,探讨了库区主要断裂带地震活动频繁的原因。研究发现:三峡库区的地震活动与蓄水位抬升具有很强的关联性,蓄水后微震活动频繁,水库地震主要是由蓄水位控制,构造性地震活动较少,而且当蓄水水位变化迅速时,地震活动更加频繁;随着水位抬升,地震震中分布向长江及主要支流的库岸汇聚;断裂带的渗透结构是影响附近地震活动频次的重要因素,在高桥断裂带附近最早出现了M大于2的地震活动集群。
Seismic activities in the Three Gorges reservoir have increased significantly due to the effects of water storage.Based on the seismic activities in the Three Gorges reservoir area since 2000,we analyzed the influence of water level change rate on seismic activity,and discussed the reasons for frequent seismic activities in the main fault zone in the reservoir area.It is found that seismic activity in the Three Gorges reservoir area has a strong correlation with the rise of water storage level,with the reservoir earthquakes being mainly controlled by water storage level.Microseismic activities become frequent after the impounding,and the tectonic seismic activities are less.Seismic activities become more frequent when the impounding water level changes rapidly.As the water level rises,the distribution of earthquake epicenters converges towards the banks of the Yangtze River and its main tributaries.The permeability structure of the fault zone in the Three Gorges reservoir area is an important factor affecting the frequency of seismic activity,and the first seismic activity cluster with M S>2.0 appears in the vicinity of Gaoqiao Fault Zone.
作者
代一鸣
张莉丽
李京海
秦维秉
姚运生
王仁龙
王允
DAI Yiming;ZHANG Lili;LI Jinghai;QIN Weibing;YAO Yunsheng;WANG Renlong;WANG Yun(Institute of Disaster Prevention,Sanhe 065201,China;Hebei Key Laboratory of Seismic Dynamics,Sanhe 065201,China;North China Engineering Investigation Institute Co.Ltd.,Shijiazhuang 050024,China;China Three Gorges Corporation,Beijing 100038,China)
出处
《防灾科技学院学报》
2023年第3期18-28,共11页
Journal of Institute of Disaster Prevention
基金
大学生创新创业项目(202211775002)
国家自然科学基金项目(41702264、42174177)
中国长江三峡集团有限公司项目(0799217)。
关键词
水库地震
三峡水库
震级
震中分布
reservoir earthquake
the Three Gorges reservoir
magnitude
epicenter distribution
