摘要：
2017年伊拉克地震发生在我们划分的巴格达地震区,鉴于不同机构提供的该震震级参数相差较大,本文利用孕震断层多锁固段脆性破裂理论,分情况讨论了该震所属地震类型,并分析了巴格达地震区地震趋势.结果表明:若2017年伊拉克地震为Mw7.3,则该震为第3锁固段向峰值强度点演化过程中发生的1次显著前震,该区未来将发生Mw7.7～8.2(双震型为Mw7.5～8.0)标志性地震,目前已接近临界状态;若2017年伊拉克地震为Mw7.5,除可能为显著前震外,还可能为标志性地震(双震)之一,若如此两年内该区将发生另一次Mw7.5地震;若2017年伊拉克地震为Ms7.8,则该震为第3锁固段峰值强度点对应的标志性地震,与我们对该震的前瞻性中长期预测结果相符.我们判断该震不为主震,预测该区未来还将发生MW7.8～8.3(双震型为Mw7.6～8.1)标志性地震,目前该区远离临界状态.%The 2017 Iraq Mw7.3 earthquake occurred in the Baghdad seismic zone defined by us.The seismic type of the earthquake is discussed according to its different magnitude parameters provided by various agencies,and then its post-quake trend in this seismic zone is analyzed in this paper,based on the theory about the brittle failures of multiple locked patches in a seismogenic fault system.The present results show that if the 2017 Iraq earthquake is with a magnitude of Mw7.3,it is identified as a significant foreshock occurred in the evolution process towards the peak strength point of the third locked patch,demonstrating that a Mw7.7～8.2 (or double earthquakes of Mw7.5～8.0) characteristic earthquake will take place in the near future because the seismic zone has closed to the critical state;if the 2017 Iraq earthquake is viewed as Mw7.5,it may yet be one of the double-shock-type characteristic earthquakes besides as a significant foreshock,implying that the other Mw7.5 earthquake will strike the seismic zone within two years;if the 2017 Iraq earthquake is viewed as Ms7.8,it is identified as a characteristic earthquake occurred at the peak strength point of the third locked patch,which is in good agreement with our prospective medium-to-long term prediction of this earthquake.Furthermore,we judge that the Ms7.8 earthquake is not a mainshock,demonstrating that the next Mw7.8～8.3 (or double earthquakes of Mw7.6～8.1) characteristic earthquake will take place in the remote future because the seismic zone is far from the critical state at present.
