Largescale numerical investigation on the potential of MTL to produce supershear earthquakes

按照计划，采用粘塑性模型模拟断层外破损区，从而控制破裂速度。我们得到了解析解，以降低与塑料模型相关的高计算成本。通过与标准工程基准的比较，验证了所实现的模型。所开发的数值格式在HPC增强环境中实现了对大尺度模型的模拟。我们模拟了Palu Koro断层上的超剪和亚瑞利事件，并证明粘塑性模型使破裂速度降低到更接近2018年Palu Koro断层超剪切事件时观察到的破裂速度。这是模型开发中的重要一步，因为它能够重现更接近自然界中观察到的破裂速度。

As planned, we implemented visco plastic model to simulate off-fault damage zone and thereby control the rupture speeds. We derived analytical solutions to reduce the high computational cost associated with plastic models. We verified the implemented models by comparing with the standard engineering benchmarks. The developed numerical schemes were implemented in HPC enhanced environment to simulate large scale models. We simulated both super shear and sub-Rayleigh events on the Palu Koro fault and demonstrated that the visco plastic model reduces the rupture speed closer to the rupture speed observed at the 2018 super shear event of the Palu Koro fault. This is an important step in the model development since it enables to reproduce rupture speeds closer to the observed in nature.