Supporting dataset for the article: Triggered and recurrent slow slip in North Sulawesi, Indonesia

<strong>Abstract</strong>Nearby faults interact with each other through the exchange of stress. However, the extent of fault interaction is poorly understood. In particular, interactions may lead to slow-slip activity, resulting in episodes of transient surface motion. Our study concentrates on Northwest Sulawesi (Indonesia), which hosts two fault zones with potential for major earthquakes and tsunamis: the strike-slip Palu-Koro fault and the Minahassa subduction zone. Thanks to a 20-year-long effort in geodetic monitoring, we are able to identify multiple periods during which surface velocities deviate from their interseismic trend. We use a Bayesian methodology with forward predictions of slip on the two fault interfaces to match the observations following the 2018 Palu earthquake, and infer that both deep afterslip on the Palu-Koro fault and slow slip on the Minahassa subduction interface have caused the observed transient surface motion. This finding represents the first recording of a slow slip event on the Minahassa subduction interface. We also infer that the subduction interface and the strike-slip fault are likely interacting on a regular basis.<br><strong>Data</strong><em>Least squares parameterization of GPS data</em><strong> </strong>contains the station positions, jumps, transients and velocities shown in figure 2A and S1-13 in .txt format.<em>RINEX GPS data </em>contains RINEX files of the campaign stations after the 2018 Palu earthquake<em>Model data</em> contains model output files used to create the figures 4,6,7, S12-17 in .txt format and two supporting images in .png format.

摘要
相邻断层可通过应力传递发生相互作用，但目前对断层相互作用的影响范围仍知之甚少。尤为关键的是，断层相互作用或可引发慢滑（slow-slip）活动，进而导致阶段性瞬态地表运动。本研究聚焦于印度尼西亚苏拉威西岛西北部区域，该区域分布着两条具备引发强震与海啸潜力的断层带：走滑（strike-slip）型帕卢-科罗断层（Palu-Koro fault）与米纳哈萨俯冲带（Minahassa subduction zone）。得益于长达20年的大地测量监测工作，我们得以识别出多段地表速度偏离震间趋势的时期。针对2018年帕卢地震后的观测数据，我们采用结合两个断层界面滑动正向预测的贝叶斯方法进行拟合，并推断：帕卢-科罗断层的深部余滑（afterslip）以及米纳哈萨俯冲界面的慢滑活动，共同引发了本次观测到的瞬态地表运动。该发现是米纳哈萨俯冲界面上首次记录到的慢滑事件。我们同时推断，俯冲界面与走滑断层或存在周期性的相互作用。

数据
GPS数据最小二乘参数化文件：包含图2A及补充材料图S1-13所示的测站位置、阶跃变化、瞬态信号与速度数据，格式为.txt。
RINEX格式GPS数据：包含2018年帕卢地震后野外观测测站的RINEX格式文件。
模型数据：包含用于生成图4、6、7及补充材料图S12-17的模型输出文件（格式为.txt），以及两张辅助图像（格式为.png）。