2015年新疆皮山M_S 6.5地震序列震源深度测定

采用震源深度测定的确定性方法(PTD)和HypoSAT方法,使用新疆地震台网记录的原始地震波形数据,计算2015年7月3日皮山M_S 6.5主震和余震序列震源深度。结果显示,对于主震,采用PTD方法得到震源深度为21 km,采用HypoSAT方法得到震源深度为20 km;对于地震序列,采用PTD方法得到的震源深度主要分布在15—35 km,平均深度为23 km,而采用HypoSAT方法得到的震源深度主要分布在5—30 km,平均深度为19 km;采用PTD方法计算得到的震源深度较深,与中国地震局地球物理研究所采用矩张量反演得到的矩心深度(24 km)相差不大。

The depth determination of Pishan MS6.5 earthquake sequence in Xinjiang area, 2015

An M_S6.5 earthquake happened on July 3, 2015 in Pishan, Xinjiang Uygur Autonomous Region, which was followed by a series of aftershocks. Using the PTD method and HypoSAT method, the focal depths of the main shock and aftershock sequence for Pishan M_S6.5 earthquake are calculated. The results show that:For this earthquake, the focal depth from PTD method is 21 km, the focal depth from HypoSAT method is 20 km. In earthquake sequence, with the PTD method, the focal depth are mainly distributed in 15-35 km, the average focal depth is 23 km, by HypoSAT method the focal depth are mainly distributed in 5-30 km, the average focal depth is 19 km. The focal depth with PTD method is deep than that from the HypoSAT method. This result is no different than the depth (24 km) with moment tensor inversion get by Institute of Geophysics, China Earthquake Administration.