GNSS (Global Navigation Satellite System) data in northern Sulawesi and western Halmahera reveals a pattern of coseismic displacement that was caused by the 7 July 2019 (Mw 6.9) and 14 November 2019 (Mw 7.1) Molucca Sea earthquakes. The coseismic slip of these earthquakes are obtained via inversion on rectangular fault planes of surface GNSS coseismic deformation offsets. The 7 July 2019 earthquake ruptured on an east-dipping fault with a maximum slip of ∼35 cm located at ∼4 km depth and ∼ 100 km north-west of the epicenter. The 14 November 2019 earthquake also ruptured on an east-dipping fault, which has a maximum slip of ∼64 cm located at ∼22 km depth and ∼ 20 km south-west of the epicenter. The coseismic slip distribution of the 14 November earthquake is spatially aligned to that of an earthquake of similar magnitude that took place on 15 November 2014 in the same region. This observation points to the possibility of synchronization, thus raising the prospect of a future earthquake exceeding magnitude 7. If the stress was completely released during the 2014 event, it would have been necessary to reload that portion of the fault at a rate significantly larger than the observed convergence rate of ∼5.8 cm/yr. This suggests that partial ruptures are likely controlling the recurrence time of large earthquakes in the region.

中文翻译：

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2019 年 Mw 6.9 和 Mw 7.1 地震揭示的与摩鹿加海分歧双俯冲带相关的复杂断层系统


苏拉威西岛北部和哈马黑拉西部的 GNSS（全球导航卫星系统）数据揭示了由 2019 年 7 月 7 日 （Mw 6.9） 和 2019 年 11 月 14 日 （Mw 7.1） 摩鹿加海地震引起的同震位移模式。这些地震的同震滑移是通过在地表GNSS同震变形偏移的矩形断层面上反演获得的。2019 年 7 月 7 日的地震在东倾断层上破裂，最大滑移为 ∼35 厘米，位于震中 ∼ 4 公里深处，西北约 100 公里处。2019 年 11 月 14 日的地震也在东倾断层上破裂，该断层位于震中 ∼ 22 公里深处，西南约 20 公里处，最大滑移为 ∼64 厘米。11 月 14 日地震的震滑分布与 2014 年 11 月 15 日在同一地区发生的类似震级地震的震移分布在空间上一致。这一观察表明了同步的可能性，因此增加了未来发生超过 7 级地震的可能性。如果在 2014 年事件期间应力完全释放，则有必要以明显大于观察到的 ∼5.8 cm/yr 的收敛速率的速度重新加载该部分断层。这表明部分破裂可能控制了该地区大地震的重现时间。