2019年甘肃张掖M5.0地震余震序列重定位
Relocation of the Aftershock Sequence of the Zhangye M5.0 Earthquake in Gansu Province in 2019

本文使用祁连山主动源台网和甘肃省数字测震台网记录到的地震资料，应用双差定位方法和遗传算法对2019年甘肃张掖M5.0地震及其余震进行重定位，获得了30个地震事件的重定位结果，双差定位显示主震位置为38.502°N，100.254°E，震源深度14.7 km。重定位结果显示余震分布在昌马-俄博断裂，较为集中，震源深度主要分布在5~15 km范围内，余震序列沿SW-NE向空间分布。
In this paper, using seismic data recorded by the active source network of the Qilian Mountain and the digital seismic network of the Gansu Province, we relocated the Zhangye M5.0 earthquake in 2019 and its aftershock using the double-difference location and genetic algorithms. Relocation results of 30 seismic events were also obtained. These results indicated that the main position of the earthquake was 38.502°N, 100.254°E, and the focal depth was 14.7 km. The aftershocks were relatively concentrated and distributed along the Changma-Ebo fault. The source depth was mainly distributed in a range of 5-15 km, while the aftershock sequence was distributed along the SW-NE