The Hojedk area in the southeastern Iran experienced three earthquakes during 12 days in December 2017. These events occurred in proximity to a region that has experienced several moderate and large events in the past. In this paper, the role of Coulomb stress changes in occurrence of the Hojedk cluster was investigated, and also the produced stress changes due to these events on the surrounding and optimally oriented faults was calculated. Previous earthquakes (events in the Golbaf–Sirch region, the Shahdad slip, and the Dahuiyeh–Zarand earthquake) imparted positive stress changes on the fault planes of the Hojedk earthquakes, especially on the ruptured plane of the first main shock. The Hojedk first main shock triggered the second one by imparting maximum stress changes of about 11.7 MPa on the fault plane of this event, and these two events brought the third main shock to failure by producing more than 6.0 MPa stress changes on its ruptured plane. Among the major active faults in the surrounding area, the middle part of the Nayband fault, northern part of the Golbaf–Sirch fault, and southern part of the Kuhbanan fault received positive stress changes and southen parts of the Ravar and all parts of the Chatrud faults received negative stress changes due to the Hojedk earthquakes. Furthermore, our results for correlation between Coulomb stress changes and seismicity distribution showed that following the Dahuiyeh–Zarand earthquake, the majority of the seismicity located on the positive stress area and Coulomb stress changes have a controlling role on the spatial distribution of seismicity even after a decade. The occurrence of the Hojedk first main shock affects the spatial distribution of aftershocks until the occurrence of the next main hocks. By triggering the next one, the stress patterns change in the area, and seismicity follows from the stress patterns of the last event.

2017年12月，伊朗东南部的霍伊德克（Hojedk）地区在12天内经历了三场地震。这些事件发生在该地区附近，该地区过去曾发生过几次中等和大型地震。本文研究了库仑应力变化在Hojedk团簇发生中的作用，并计算了由于这些事件在周围和最佳定向断层上产生的应力变化。以前的地震（在Golbaf–Sirch地区发生的事件，Shahdad滑坡和Dahuiyeh–Zarand地震）在Hojedk地震的断层面上，尤​​其是在第一次主震破裂的平面上赋予了正应力变化。Hojedk的第一次主震通过在该事件的断层面上施加大约11.7 MPa的最大应力变化而触发了第二次主震，这两个事件通过在破裂平面上产生超过6.0 MPa的应力变化，使第三次主震失败。在周边地区的主要活动断层中，内班带断层的中部，戈尔巴夫-瑟奇断层的北部和库班南部断层的南部受到了正应力变化，拉瓦尔的南部和查德鲁德的所有部分霍伊奇克地震使断层承受了负应力变化。此外，我们对库仑应力变化与地震活动性分布之间的相关性的研究结果表明，在大回耶－扎兰德地震之后，即使在地震发生后，大部分位于正应力区的地震活动性和库仑应力变化也对地震活动性的空间分布具有控制作用。十年。霍伊奇克第一次主震的发生会影响余震的空间分布，直到下一次主震的发生。通过触发下一个事件，该区域的应力模式发生变化，地震活动从上一个事件的应力模式开始。