| 仙女山-九畹溪断裂带附近地区地震活动性与静态库仑应力变化研究 |
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| 引用本文： | 常 婷,张丽芬,王秋良,何超枫.仙女山-九畹溪断裂带附近地区地震活动性与静态库仑应力变化研究[J].大地测量与地球动力学,2020,40(10):1044-1048. |
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| 作者姓名： | 常 婷 张丽芬 王秋良 何超枫 |
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| 摘 要： | 基于仙女山-九畹溪断裂带附近地区地质构造，讨论三峡水库蓄水前后该断裂带附近地区的地震活动特征，同时分析该区域2014-03 M4.5与M4.7地震间的触发关系及2次地震对后续小震的影响。结果表明：1）M4.7地震可能由M4.5地震与库水渗流产生的较大孔隙压力共同触发。2）M4.5与M4.7两次地震的应力扰动导致研究区内地震活动增加，后续地震中约66.9%的地震发生于库仑应力增强区。3）2次地震产生的静态库仑应力变化导致仙女山断裂带附近地区地震活动增加，后续地震活动水平将处于背景地震活动水平之上；九畹溪断裂带活动性相对较弱，略小于背景地震活动水平，且处于应力积累阶段。
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| 关 键 词： | 静态库仑应力 地震活动性 仙女山-九畹溪断裂带 |
Study on Seismic Activity and Static Coulomb Stress Variationin the Vicinity of Xiannüshan-Jiuwanxi Fault Zone |
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| CHANG Ting,ZHANG Lifen,WANG Qiuliang,HE Chaofeng.Study on Seismic Activity and Static Coulomb Stress Variationin the Vicinity of Xiannüshan-Jiuwanxi Fault Zone[J].Journal of Geodesy and Geodynamics,2020,40(10):1044-1048. |
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| Authors: | CHANG Ting ZHANG Lifen WANG Qiuliang HE Chaofeng |
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| Abstract: | Based on geological structure of regions near the Xiannüshan-Jiuwanxi fault zone, we discuss the characteristics of seismic activity in the vicinity of the Three Gorges Reservoir before and after impoundment. The triggering relationship between M4.5 and M4.7 earthquakes occurred on 2014-03 and the influence of the two earthquakes on subsequent small earthquakes is further studied. The results show that the M4.7 earthquake may be jointly triggered by M4.5 earthquake and large pore pressure caused by water seepage. The stress disturbance of M4.5 and M4.7 earthquakes led to the increase of seismic activity in the study area, and about 66.9% of the subsequent earthquakes occurred in the area of Coulomb stress enhancement. Variation of static Coulomb stress caused by two earthquakes led to the increase of seismicity near the Xiannüshan fault zone. The seismicity near Xiannüshan fault zone will be above the background seismicity in the coming period. The activity of Jiuwanxi fault zone is relatively weak, slightly less than background seismicity and in the stage of stress accumulation. |
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| Keywords: | static Coulomb stress seismic activity Xiannüshan-Jiuwanxi fault zone |
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