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首页> 外文期刊>Journal of Asian earth sciences >Toward real-time regional earthquake simulation Ⅱ: Real-time Online earthquake Simulation (ROS) of Taiwan earthquakes
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Toward real-time regional earthquake simulation Ⅱ: Real-time Online earthquake Simulation (ROS) of Taiwan earthquakes

机译：走向实时区域地震模拟Ⅱ：台湾地震实时在线地震模拟（ROS）

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We developed a Real-time Online earthquake Simulation system (ROS) to simulate regional earthquakes in Taiwan. The ROS uses a centroid moment tensor solution of seismic events from a Real-time Moment Tensor monitoring system (RMT), which provides all the point source parameters including the event origin time, hypocentral location, moment magnitude and focal mechanism within 2 min after the occurrence of an earthquake. Then, all of the source parameters are automatically forwarded to the ROS to perform an earthquake simulation, which is based on a spectral-element method (SEM). A new island-wide, high resolution SEM mesh model is developed for the whole Taiwan in this study. We have improved SEM mesh quality by introducing a thin high-resolution mesh layer near the surface to accommodate steep and rapidly varying topography. The mesh for the shallow sedimentary basin is adjusted to reflect its complex geometry and sharp lateral velocity contrasts. The grid resolution at the surface is about 545 M., which is sufficient to resolve topography and tomography data for simulations accurate up to 1.0 Hz. The ROS is also an infrastructural service, making online earthquake simulation feasible. Users can conduct their own earthquake simulation by providing a set of source parameters through the ROS webpage. For visualization, a ShakeMovie and ShakeMap are produced during the simulation. The time needed for one event is roughly 3 min for a 70 s ground motion simulation. The ROS is operated online at the Institute of Earth Sciences, Academia Sinica. Our long-term goal for the ROS system is to contribute to public earth science outreach and to realize seismic ground motion prediction in real-time.
机译：我们开发了实时在线地震模拟系统（ROS），以模拟台湾的区域地震。 ROS使用来自实时矩张量监控系统（RMT）的地震事件的质心矩张量解，该系统在地震发生后2分钟内提供所有点源参数，包括事件起源时间，震中位置，矩震级和震源机制。发生地震。然后，将所有源参数自动转发到ROS，以基于光谱元素方法（SEM）进行地震模拟。这项研究为整个台湾开发了一个新的全岛范围的高分辨率SEM网格模型。通过在表面附近引入薄的高分辨率网格层以适应陡峭且快速变化的地形，我们提高了SEM网格质量。调整了浅沉积盆地的网格，以反映其复杂的几何形状和明显的横向速度差异。表面的网格分辨率约为545 M.，足以解析出形貌和断层图像数据，可进行高达1.0 Hz的精确模拟。 ROS也是一种基础设施服务，使在线地震模拟变得可行。用户可以通过ROS网页提供一组震源参数来进行自己的地震模拟。为了可视化，在模拟过程中会生成ShakeMovie和ShakeMap。对于70秒的地面运动仿真，一个事件所需的时间大约为3分钟。 ROS在中国科学院地球科学研究所在线运行。我们对于ROS系统的长期目标是促进公共地球科学领域的发展并实现实时的地震地震动预测。

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