In December 2017, a triplet earthquake sequence of M_w 5.8–6.1 occurred near Hojedk, southeast Iran. The sequence was not destructive, but occurred in a highly seismically active region that previously experienced the 1981–1998 Sirch-Golbaf earthquake sequence and destructive 2003 M_w 6.6 Bam earthquake. We apply a waveform inversion method based on the modeling of regional seismic broadband data to derive the point source and kinematic rupture parameters of the triplet and its five significant aftershocks. The choice of an earthquake source model with a reduced number of parameters and a sequential inversion process with several iterations result in unique and stable earthquake source solutions. Within the inversion process, we combine the modeling of low- and high-frequency seismological data to retrieve the moment tensor and the kinematic source parameters. Synthetic seismogram and spectra are generated for an accurate regional velocity model. Our results suggest that the triplet ruptured a segmented fault system, with centroid locations aligned along a single lineament. Estimation of rupture directivity suggests the activation of SE-NW structure. In conclusion, we suggest that the triplet was associated with the failure of one or more aligned blind thrust faults, oriented SE-NW and dipping to the NE, in a restraining bend between strike-slip faults in a region that is a part of the greater system of the present continental shortening in Iran.

在2017年十二月，M的三重地震序列_W¯¯ 5.8-6.1发生Hojedk，伊朗东南部靠近。该序列没有破坏性，但发生在地震活跃度高的区域，该区域先前曾经历过1981–1998年Sirch-Golbaf地震序列和破坏性2003 M _w6.6巴姆地震。我们应用基于区域地震宽带数据建模的波形反演方法，得出三元组及其五次余震的点源和运动破裂参数。选择参数数量减少的地震震源模型，以及经过多次迭代的顺序反演过程，可以得出独特而稳定的地震震源解。在反演过程中，我们结合了低频和高频地震数据的建模，以获取弯矩张量和运动源参数。合成的地震图和频谱可生成精确的区域速度模型。我们的结果表明，三重态破裂了一个分段的断层系统，质心的位置沿着一条单一的线排列。断裂指向性的估计表明SE-NW结构的激活。总之，我们认为三重态与一个或多个对准的盲冲断层，SE-NW定向和向NE倾角的破坏有关，在该区域的走滑断层之间的约束弯曲中。伊朗目前的大陆缩短的更大体系。