基于遗传算法的大厂矿区地震定位研究

The Study on Precise Positioning of Earthquake in Dachang Mining Area Based on Genetic Algorithm

基于遗传算法对大厂矿区的地震进行重新定位。为验证该方法在大厂矿区的应用效果,首先对已知的5次人工爆破进行定位,得出平均定位水平误差在146m范围内(矿区台网定位水平误差为500m),进而对大厂矿区的81次ML1.0级以上地震进行重新定位,结果表明:大厂矿震主要呈北西向展布,且主要集中在大厂断裂右侧;较大地震均与大厂断裂呈平行状分布,推断其附近可能有隐伏断层存在;大厂矿区地震主要受北西向断层的影响,受北东向断层的影响不大。定位后震源平均深度为2.8km,最大深度6.5km,最小深度1.5km。

In this paper, the genetic algorithm is used to relocate earthquakes in Dachang mining area. To verify its effect, we relocated artificial blasting by five times which are recorded precisely in this area firstly. The result shows that the average relocate error is in the range of 146 meters （the Mining area station net positioning accuracy is 500 meters） . Then we relocated 81 earthquakes which are greater than Richter scale 1. 0 in this area. The results show that Dachang Mine earthquakes mainly distribute in northwestwards and concentrate in the right - side of the Dachang fault. It also shows that the large earthquakes are paralleled to Dachang fault and deduce that there is concealed fault nearby. The earthquakes in this area are mainly affected by the NW trending fault, and little influenced by NE trending fault. The results show that the mean focal depth is 2. Skrn , the maximum depth is 6. 5km, and the minimum depth is 1. 5 km.