On September 28, 2018, the Mw 7.5 earthquake occurred in Palu, Central Sulawesi, Indonesia. This earthquake produced strong tremors, landslides, liquefaction and a tsunami and caused thousands of fatalities and damaged houses and infrastructure. We have relocated 386 of the 554 Palu aftershocks by using the double-difference relocation method (hypoDD) from September 28 to November 22, 2018. The aftershock pattern is consistent with the crustal deformation in the area and generally shows that the events have a NW–SE trending of ~ 200 km in length and ~ 50 km in width. Most of the aftershocks are located to the east of the Palu-Koro Fault Line. Since November 2, 2018, there have been hundreds of swarm earthquakes in the area of Mamasa, West Sulawesi, which is about 230 km south of the city of Palu. Some of these earthquakes were felt, and houses were even damaged. We have relocated 535 of the 556 swarm earthquakes having a magnitude of M 2 to M 5.4. Our results show that the seismicity pattern has a dip that becomes shallower to the west (dipping at a ~ 45° angle) and extends from north to south for a length of ~ 50 km. We also conducted a focal mechanism analysis to estimate the type of fault slip for selected events of an M > 4.5 magnitude. Most of the solutions of the focal mechanism analysis show a normal fault type. This swarm earthquake probably corresponds to the activity of the fault in the local area.

中文翻译：

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利用BMKG网络数据对印尼帕劳州7.5级帕卢7.5级地震（2018年9月28日）和群地震余震进行震源重定位

2018年9月28日，印度尼西亚中苏拉威西省帕卢发生了7.5级地震。这次地震造成了强烈的地震，山体滑坡，液化和海啸，造成了数千人死亡，房屋和基础设施遭到破坏。从2018年9月28日至11月22日，我们使用双差重定位法（hypoDD）重定位了554帕卢余震中的386个。余震模式与该地区的地壳变形一致，通常表明该事件具有西北–SE的趋势为：长度约200 km，宽度约50 km。大多数余震位于帕卢－科罗断层线以东。自2018年11月2日以来，西苏拉威西省Mamasa地区发生了数百场大地震，该地区位于帕卢市以南约230公里。感觉到其中一些地震，房屋甚至被毁。我们已经将556个地震的535个震级从M 2迁移到5.4。我们的结果表明，地震活动模式的倾角向西变浅（以约45°角倾角），并从北向南延伸约50 km。我们还进行了震源机制分析，以估计M> 4.5大小的选定事件的断层滑动类型。震源机制分析的大多数解决方案都显示出正常的故障类型。此群地震可能与局部断层的活动相对应。我们的结果表明，地震活动模式的倾角向西变浅（以约45°角倾角），并从北向南延伸约50 km。我们还进行了震源机制分析，以估计M> 4.5大小的选定事件的断层滑动类型。震源机制分析的大多数解决方案都显示出正常的故障类型。此群地震可能与局部断层的活动相对应。我们的结果表明，地震活动模式的倾角向西变浅（以约45°角倾角），并从北向南延伸约50 km。我们还进行了震源机制分析，以估计M> 4.5量级选定事件的断层滑动类型。震源机制分析的大多数解决方案都显示出正常的故障类型。此群地震可能与局部断层的活动相对应。