The 2018 Palu earthquake is a remarkable strike‐slip event due to its nature as a shallow supershear fault rupture across several segments and a destructive tsunami that followed coseismic deformation. GPS offsets in the wake of the 2018 earthquake display a transient in the surface motions of northwest Sulawesi. A Bayesian approach identifies (predominantly aseismic) deep afterslip on and below the coseismic rupture plane as the dominant physical mechanism causing the cumulative, postseismic, surface displacements whereas viscous relaxation of the lower crust and poro‐elastic rebound contribute negligibly. We confirm a correlation between shallow supershear rupture and postseismic surface transients with afterslip activity in the zone below an interseismically locked fault plane where the slip rate tapers from zero to creeping.

中文翻译：

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浅层超剪切地震后深后滑为主的瞬态表面运动：2018年Mw7.5 Palu壳

2018年 帕卢地震是一个非凡的走滑事件，因为它的性质是跨几个段的浅层超剪切断裂以及同震变形之后的破坏性海啸。2018年地震后的GPS偏移显示了苏拉威西西北部的地表运动是短暂的。贝叶斯方法将同震破裂平面上和下方的深层滑移（主要是抗震）识别为造成累积的，震后地表位移的主要物理机制，而下地壳的粘性松弛和孔隙弹性回弹的贡献可忽略不计。我们确认了浅超剪切断裂与地震后表面瞬变之间的相关性，其间滑移率从零到蠕变逐渐减小，位于间震锁定断层平面下方的区域中，具有后滑活动。