We present here an analysis of the destructive Mw 6.2 earthquake sequence that took place on 14 January 2021 in Mamuju–Majene, West Sulawesi, Indonesia. Our relocated foreshocks, mainshock, and aftershocks and their focal mechanisms show that they occurred on two different fault planes, in which the foreshock perturbed the stress state of a nearby fault segment, causing the fault plane to subsequently rupture. The mainshock had relatively few aftershocks, an observation that is likely related to the kinematics of the fault rupture, which is relatively small in size and of short duration, thus indicating a high stress-drop earthquake rupture. The Coulomb stress change shows that areas to the northwest and southeast of the mainshock have increased stress, consistent with the observation that most aftershocks are in the northwest.

在此，我们对2021年1月14日在印度尼西亚西苏拉威西岛的Mamuju–Majene发生的6.2级Mw破坏性地震序列进行分析。我们重新布置的前震，主震和余震及其震源机制表明，它们发生在两个不同的断层平面上，其中前震扰动了附近断层段的应力状态，导致断层平面随后破裂。主震余震相对较少，这可能与断层破裂的运动学有关，断层破裂的规模较小，持续时间较短，因此表明应力降地震破裂的可能性较高。库仑应力变化表明，主震西北部和东南部地区的应力增加，这与大多数余震位于西北部的观察结果一致。