We introduce FD3D_TSN—an open‐source Fortran code for 3D dynamic earthquake rupture modeling based on the staggered grid fourth‐order finite‐difference method employing a regular cubical spatial discretization. Slip‐weakening and fast‐velocity‐weakening rate‐and‐state fault friction laws are combined with vertical planar fault geometry, orthogonal to a planar free surface. FD3D_TSN demonstrates good agreement with other methods in a range of benchmark exercises of the Southern California Earthquake Center and U.S. Geological Survey dynamic rupture code verification project. Efficient graphic processing units (GPU) acceleration using the OpenACC framework yields a factor of 10 speed‐up in terms of time to solution compared to a single‐core solution for current hardware (Intel i9‐9900K and Nvidia RTX 2070). The software is fast and easy‐to‐use and suitable explicitly for data‐driven applications requiring a large number of forward simulations such as dynamic source inversion or probabilistic ground‐motion modeling. The code is freely available for the scientific community and may be incorporated in physics‐based earthquake source imaging and seismic hazard assessment, or for teaching purposes.

中文翻译：

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FD3D_TSN：具有GPU加速功能的动态破裂仿真的快速，简单代码

我们介绍FD3D_TSN，这是一种基于Fortran代码的3D动态地震破裂建模方法，它基于采用规则立方空间离散化的交错网格四阶有限差分方法。滑动弱化和快速速度弱化速率与状态断层摩擦定律与垂直于平面自由表面的垂直平面断层几何形状相结合。FD3D_TSN在南加州地震中心和美国地质调查局动态破裂代码验证项目的一系列基准测试中显示出与其他方法的良好一致性。与当前硬件（英特尔i9-9900K和Nvidia RTX 2070）的单核解决方案相比，使用OpenACC框架进行的高效图形处理单元（GPU）加速可将解决时间提高10倍。该软件快速，易于使用，并且明确适用于需要大量前向仿真（例如动态源反演或概率地震动建模）的数据驱动应用。该代码可供科学界免费使用，并且可以结合到基于物理的地震震源成像和地震灾害评估中，或用于教学目的。