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

MTL 产生超剪切地震潜力的大规模数值研究

• 批准号: 22H01573
• 负责人: Maddegedar a.L.
• 金额: $ 10.15万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2026-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22H01573/
• 关键词: fault rupture; large sclae simulations; super-shear; PDS-FEM; far-field boundary; off-fault damage zone; visco-plasticity; rupture speed; sub-Rayleigh; super-shear rupture; far-field loading; MTL; HPC

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.

按照计划，我们实施粘塑性模型来模拟断层外的破坏区，从而控制破裂速度。我们推导出解析解，以减少与塑料模型相关的高计算成本。我们通过与标准工程基准比较来验证所实现的模型。在HPC增强环境中实现了所开发的数值格式，以模拟大尺度模式。我们模拟了Palu Koro断层上的超级剪切和亚瑞利事件，并证明了粘塑性模型降低了破裂速度，使其更接近2018年Palu Koro断层超级剪切事件中观察到的破裂速度。这是模型开发中的重要一步，因为它能够再现更接近自然界中观察到的破裂速度。