Datasets and movies supporting works on The Role of Along-Fault Dilatancy in Fault Slip Behavior

The framework of the dataset and movies: The data, scripts, and movies provided here support the work of Yannick Caniven, Julia K Morgan, and David G Blank on the role of the along-fault dilatancy on fault slip behavior. This work concerns discrete element modeling using the code Ricebal developed at the Rice University, Houston, Texas, USA. The approach used here allows for simulating the behavior of a strike-slip fault at the seismic time scale, investigating the nucleation processes of slow-earthquakes and fast earthquakes. The dataset: The directory DATASET.zip provides all data and results described in Caniven et al., 2021. The data set provides files containing: - particle positions (b-*.out) - time-series of stress ratio and dilatancy (dy/dx) at the wall of the model (WALL-FRIC_frames_*.txt and Dilation-frames_*.txt) - time-space maps folders containing stacked slip-velocity and dilatancy along-fault profiles (MAP_Dilatancy_*_*.txt) All these files can be used to plot all visualizations presented from Figure 2 to Figure 8 in the related paper. For each figure directory, we provide an example of scripts (*.sh and *.py) that can be used to display the data using the GMT software (Global Mapping Tools) or Python. The provided scripts have been developed to be used with GMT 5.4.4 and Python 3.9.2 (using Spyder 4.2.3 in Anaconda 1.10). The use of other versions may require some adjustments. All scripts from Figure 2 to Figure 6 can be launched straightforwardly without any additional setting. To use the script in the Figure7-8 directory, please follow the instructions in the script header. The supporting movies: Movie S1 shows an example of the evolution of particle displacements at the global model scale, here during the occurrence of the fast Eq4 earthquake sequence (see Figure 7 in the paper). Note the slow nucleation of slip associated with the precursory dilation (see Figure 7b in the paper) before the onset of the dynamic stage and propagation of seismic waves. Movie S2 highlights the detailed evolution of particle displacements across the regions of the isolated slow-earthquake SEq1. The nucleation zone of this event exhibits several areas close to their failure points (apex) at different states that accommodate both fault dilation and contraction in response to the far-field imposed displacement (see Figure 8a in the paper). Movie S3 highlights the detailed evolution of particle displacements across the regions of the fast earthquake Eq3. Most asperities on each side of the main narrow nucleation zone approach failure in a synchronized state leading to general dilation and fast slip (see Figure 8b in the paper).数据集与配套影片框架：本数据集、脚本及影片支持Yannick Caniven、Julia K Morgan与David G Blank关于沿断层扩容（fault dilatancy）对断层滑移行为影响的研究工作。该项研究采用美国德克萨斯州休斯顿莱斯大学开发的Ricebal离散元建模代码开展。本研究方法可模拟走滑断层在地震时间尺度下的行为，探究慢地震与快地震的成核过程。 数据集：DATASET.zip压缩包包含Caniven等人2021年研究中提及的全部数据与结果。该数据集包含以下类型文件： - 颗粒位置文件（b-*.out） - 模型壁面处应力比与扩容（dy/dx）的时间序列文件（WALL-FRIC_frames_*.txt与Dilation-frames_*.txt） - 包含沿断层堆叠滑移速度与扩容剖面的时空图文件夹（MAP_Dilatancy_*_*.txt） 上述所有文件均可用于复现相关论文中图2至图8的全部可视化结果。 针对每个图片对应的目录，我们提供了可通过GMT（Global Mapping Tools，通用制图工具）或Python读取数据的示例脚本（*.sh与*.py）。本配套脚本适配GMT 5.4.4与Python 3.9.2版本（基于Anaconda 1.10中的Spyder 4.2.3开发），使用其他版本可能需要进行部分调整。图2至图6对应的脚本可直接运行，无需额外设置。若需使用图7-8目录下的脚本，请遵循脚本头部的说明进行操作。 配套影片： 影片S1展示了全局模型尺度下颗粒位移的演化过程，对应快地震Eq4序列的发生过程（详见论文图7）。需注意在动态阶段启动与地震波传播前，存在伴随前兆扩容的滑移缓慢成核过程（详见论文图7b）。 影片S2详细展示了孤立慢地震SEq1区域内颗粒位移的演化过程。该事件的成核区域存在多个处于不同状态、接近失效临界点（顶点）的区域，这些区域可响应远场施加的位移，同时实现断层扩容与收缩（详见论文图8a）。 影片S3详细展示了快地震Eq3区域内颗粒位移的演化过程。主狭窄成核区两侧的多数凹凸体以同步状态接近失效，进而引发整体扩容与快速滑移（详见论文图8b）。