TY - JOUR
T1 - Toward real-time regional earthquake simulation II
T2 - Real-time Online earthquake Simulation (ROS) of Taiwan earthquakes
AU - Lee, Shiann Jong
AU - Liu, Qinya
AU - Tromp, Jeroen
AU - Komatitsch, Dimitri
AU - Liang, Wen Tzong
AU - Huang, Bor Shouh
N1 - Funding Information:
We used the open source SPECFEM3D software package ( www.geodynamics.org , last accessed April 2013) developed by Komatitsch et al. (2004) in this study. We would thank Dr. Carl Tape for his comment and suggestions, which significantly improved the quality of the paper. We would also like to thank Mr. C.L. Tsai for technical support of the ROS webpage. All online simulations and visualizations were carried out on IES’s Green cluster. This research was support by Academia Sinica (AS) funded through the Taiwan Numerical Earthquake Model (TNEM) project with grant number 102-Investigator Award-02. The study was also supported by the Taiwan Earthquake Research Center (TEC) funded through the National Science Council (NSC) Grant number NSC 100-2628-M-001-007-MY3 . The TEC contribution number for this article is 00099.
PY - 2014/6/15
Y1 - 2014/6/15
N2 - 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 (http://ros.earth.sinica.edu.tw/). 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.
AB - 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 (http://ros.earth.sinica.edu.tw/). 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.
KW - Real-time Online earthquake Simulation
KW - ShakeMap
KW - ShakeMovie
KW - Spectral-element method
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U2 - 10.1016/j.jseaes.2014.02.009
DO - 10.1016/j.jseaes.2014.02.009
M3 - Article
AN - SCOPUS:84895760517
SN - 1367-9120
VL - 87
SP - 56
EP - 68
JO - Journal of Asian Earth Sciences
JF - Journal of Asian Earth Sciences
ER -