由远场数据快速反推伊拉克-伊朗Mw7.3地震事件过程

Fast Extrapolation of Iraq-Iran Mw7.3 Event Process Using Far-field Data

2017年Mw7.3伊拉克-伊朗交界附近发生了Mw7.3级地震,此次地震事件造成至少530人死亡,超过7200人受伤。地震发生后,快速给出地震事件的发生过程,能为快速救灾提供非常有价值的信息。为此,搜集了此次地震事件的远场数据,利用反演方法,采用矩形断层模型反推了此次地震事件过程。结果表明,此次地震事件过程较简单,表现为逆冲型,在初始破裂位置产生了最大的滑动5.2 m。整个地震事件持续20 s左右,主要的能量释放为前10 s,释放了总能量的75%。整个破裂范围825 km^(2),应力降6.1 MPa。研究结果为事件后救援工作的开展提供重要的参考。

In 2017,an earthquake with a magnitude of Mw7.3 occurred near the Iraq-Iran border,which killed at least 530 people and injured more than 7200 people.After the event,giving a fast event occurring process can provide very valuable information for rapid disaster relief.Therefore,the far-field data near the Iraq-Iran border of Mw7.3 in 2017 were collected.Using the inversion method,the event process of the earthquake was deduced by using the rectangular fault mode.The results show that the event process is relatively simple,showing a thrust type,with a maximum slip of 5.2 m at the initial fracture position.The event lasted for 20 s,and the main energy release was at the first 10 s,releasing 75%of the total energy.The whole fracture range is 825 km^(2) and the stress drop is 6.1 MPa.The research results provide an important reference for the development of post-accident rescue work.