2005年新疆克孜尔震群的重新定位

用双差地震定位法对2005年9月23日克孜尔震群进行重新定位。 从平面上, 重新定位地震集中分布在一个长约14.5 km, 宽约 9.0 km的长方形内, 其长轴为N30°W向, 与克孜尔断裂近乎垂直。 从震源深度来看, 重新定位地震的震源深度全部分布在21 km以内, 集中分布在10~19 km, 平均深度为13.6 km; 震群中绝大部分小震发生在沉积层内, 而震级较大地震基本发生在结晶地壳的上地壳内。 其剖面图显示, 这次震群是从结晶地壳开始沿着N30°W方向向上破裂至沉积层。 根据震区附近断裂性质和该区历史小震震中分布分析认为, 克孜尔水库库区附近可能存在两条共轭断裂, 右翼断裂可能是这次震群的发震构造。

Relocating the kezir earthquake swarm occurred in 2005

The Kezir earthquake swarm occurred on Sep. 23, 2005 was relocated with the double different earthquake location algorithm. The result shows that distribution of the earthquake and aftershocks is in a rectangle with long margin of 14.5 km and width margin of 9.0 km, and the direction of long axis is N30°W, it nearly parallel to the Kezir fault. The depth is distributed within 21 km, and the most are concentrated between 10~19 km, the average depth is 13.6 km; most of the small earthquakes occurred in the sedimentary cover, but the majority of earthquakes with bigger magnitude occurred in the upper crystalline crust. The earthquake swarm ruptures from crystalline crust to sedimentary cover along the N30°W direction. According to the characteristics of faults near the epicenter region and the distribution of historical earthquakes, two conjugate faults maybe exist in the Kezir reservoir region, and the right fault may be the causative fault of earthquake swarm.