【摘要】 利用双差定位方法对瀑布沟水库区域内2006-10-13~2013-07-31之间发生的3 784个地震进行了重新定位,获得了3 601个地震的重新定位结果,到时残差平均为0.12 s,E-W、N-S和U-D三个方向上平均定位误差分别为0.15 km、0.17 km和1.10 km。重新定位结果显示,在研究区域内的西南方向和水库流域,地震分布密集,这个区域处于鲜水河断裂中南段、安宁河断裂北段和大凉山断裂北段的位置,此区域内地震震源深度主要分布在5~30km间,表明该区域的地震主要是构造活动引起的,而水库库区内地震震源深度主要分布在0~5 km区间,分布比较集中,该地区的地震为水库诱发和人工爆破引起的地震。更多还原

【Abstract】 The double difference location method is used to relocate 3601 epicenters from 3784 earthquakes occurred in the regime of Pubugou Dam from 13 October 2006 to 31 July 2013. The mean residual is 0. 12s. The E- W,N-S and U- D location residuals are 0. 15 km,0. 17 km and 1. 1 km respectively. From the figure of new epicenters we find that the seismic clusters are distributed around the regime of Pubugou Dam and Dam’s south-western regime. At the same time the dam regime is located near the converge region of the middle-south section of Xianshuihe fault,the northern section of Anninghe fault and the Daliangshan fault. According to the depth of new earthquake locations we think that the earthquakes with the depth from 5 to 30 kilometers are caused by the tectonic activity of the seismic faults within the dam regime and the other earthquakes with the depth from 0 to 5 kilometers are induced by the Pubugou Dam and by the man-made explosion nearby.更多还原