A co-seismic fault slip distribution for the Mw 7.5 2018 Palu earthquake

This dataset contains a finite fault model of the co-seismic slip distribution of the 2018 <i>M_w</i> 7.5 Palu earthquake. This finite fault model was used in the study of post-seismic surface displacements following the 2018 <i>M_w</i> 7.5 Palu earthquake (in Geochemistry, Geophysics, Geosystems entitled: A transient in surface motions dominated by deep afterslip subsequent to a shallow supershear earthquake: the 2018 <i>M_w</i> 7.5 Palu case).<br>This finite fault model was determined as an intermediate result in another study, on the co-seismic surface displacement and tsunami generation by Simons and Broerse et al. which is currently (Februari 2021) in preparation entitled: “A tsunami generated by a strike-slip event: constraints from space geodesy on the 2018 Palu earthquake”. This study combines co-seismic GPS offsets with a multitude of SAR-derived displacement fields in a Bayesian approach to infer the most likely fault slip distribution on a set of fault segments in NW Sulawesi. The surface fault trace dictates the succession of linear fault segments with distinct dip angles that loosely connect to a long segment at depth. This fits well within the tectonic setting of the Palu Valley and Bay area which is characterized as a transtensional basin. In this finite fault model it is assumed that the surface fault trace is continuous in Palu Bay so that those segments north and south of Palu Bay continue offshore with their respective azimuths and connect.

本数据集包含2018年矩震级（M_w）7.5帕卢地震的同震滑动分布有限断层模型。该有限断层模型曾被用于2018年矩震级7.5帕卢地震的震后地表位移研究，相关成果发表于《地球化学、地球物理学、地球系统》（Geochemistry, Geophysics, Geosystems）期刊，论文标题为《浅层超剪切地震后以深部余滑为主导的地表运动瞬态现象：以2018年M_w7.5帕卢地震为例》。
该有限断层模型是Simons与Broerse等人另一项研究的中间成果，该项研究聚焦于同震地表位移与海啸生成，目前（2021年2月）处于筹备阶段，论文标题为《走滑事件引发的海啸：基于空间大地测量对2018年帕卢地震的约束》。该项研究采用贝叶斯方法，将同震GPS偏移量与大量合成孔径雷达（SAR）反演的位移场相结合，以推断苏拉威西西北部一组断层段上最具可信度的断层滑动分布。地表断层迹线限定了一系列具有不同倾角的线性断层段，这些断层段在深部与一条长断层段松散相连。这一模型与帕卢谷及帕卢湾区域的构造背景高度吻合，该区域被认定为张扭性盆地。本有限断层模型假设帕卢湾内的地表断层迹线为连续状态，使得帕卢湾南北两侧的断层段能够以各自的方位角向近海延伸并相互衔接。