Abstract
Integrated earthquake simulation (IES) is a seamless simulation of analyzing all processes of earthquake hazard and disaster. There are two difficulties in carrying out IES, namely, the requirement of large scale computation and the requirement of numerous analysis models for structures in an urban area, and they are solved by taking advantage of High Performance Computing (HPC) and by developing a system of automated model construction. HPC is a key element in developing IES, as it needs to analyze wave propagation and amplification processes in an underground structure; a model of high fidelity for the underground structure exceeds a degree-of-freedom larger than 100 billion. Examples of IES for Tokyo Metropolis are presented; the numerical computation is made by using K computer, the supercomputer of Japan. The estimation of earthquake hazard and disaster for a given earthquake scenario is made by the ground motion simulation and the urban area seismic response simulation, respectively, for the target area of 10,000 $\times$ 10,000 m.
Highlights
Estimation of earthquake hazard and disaster has been a core theme of earthquake engineering, and, recently, some systems have been developed for this purpose; see HAZUS (2017) and GEM (2015)
This paper presents recent achievement of developing Integrated Earthquake Simulation (IES), by taking advantage of High performance computing (HPC)
Integrated earthquake simulation (IES) enhanced with high performance computing (HPC) enables us to develop a method of making a rational estimation of earthquake hazard and disaster for Tokyo Metropolis when an earthquake scenario is given
Summary
Estimation of earthquake hazard and disaster has been a core theme of earthquake engineering, and, recently, some systems have been developed for this purpose; see HAZUS (2017) and GEM (2015). Large-Scale Regional Earthquake Simulation element, there are many numerical methods for structural seismic responses analysis which are used for the seismic design. While the question made above is natural, it is not easy to replace the empirical equations with the numerical simulation for the estimation of earthquake hazard and disaster This is because there are two major difficulties; see Figure 2. The second difficulty is that an analysis model has to be constructed for each structure which is located in a target urban area. The authors have been developing a system for the estimation of earthquake hazard and disaster that uses a set of numerical analysis methods Developing such a system is a challenging problem even for modern computational science since the target is an urban area. The resulting estimation of earthquake hazard and disaster made by IES is being compared with that made by the conventional method together with the observed data of 2011 Tohoku Earthquake
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