Japan Geoscience Union Meeting 2016

Presentation information


Symbol S (Solid Earth Sciences) » S-TT Technology & Techniques

[S-TT55] Creating future of solid Earth science with high performance computing (HPC)

Tue. May 24, 2016 3:30 PM - 5:00 PM A02 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Takane Hori(R&D Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology), tsuyoshi ichimura(Earthquake Research Institute,The University of Tokyo), Ryota Hino(Graduate School of Science, Tohoku University), Taro Arikawa(Port and Airport Research Institute), Takamasa Iryo(Kobe University), Chair:Takane Hori(R&D Center for Earthquake and Tsunami, Japan Agency for Marine-Earth Science and Technology)

3:45 PM - 4:00 PM

[STT55-02] Application of High Performance Computing to Earthquake Hazard and Disaster Simulation

★Invited papers

*Muneo Hori1,2, Tsuyoshi Ichimura1, Lalith Wijerathne1, Hideyuki Ohtani2, Jian Chen2, Kohei Fujita2 (1.Earthquake Research Institute, The University of Tokyo, 2.Advanced Institute of Computational Science, RIKEN)

Keywords:high performance computing, earthquake hazard, earthquake disaster

The utilization of high performance computing (HPC) is a key issue for more rational prediction of earthquake hazard and disaster. In principle, all physical processes of the seismic wave propagation and the resulting structural seismic responses are described in terms of sold wave equations, and it is a solution to numerically solve the equations using an analysis model of high fidelity. High performance computing solves uncertainty of material properties that appear in the solid wave equations by considering a suitable stochastic distribution and using ensemble computing.
This presentation explains recent achievement of applying HPC to earthquake hazard and disaster simulation. Explained are two targets, namely, the seismic structural response of an important structure and the urban earthquake disaster simulation. K computer, the supercomputer in Japan, is used to solve the wave equations of these two targets.
As for the seismic structural response analysis, the numerical treatment of non-linear material properties that include the occurrence and propagation of multiple-cracks is a bottleneck of applying HPC. A new discretization scheme is developed for crack which is discontinuity of displacement function. General purpose numerical analysis methods are being developed which are applicable to structures.
Urban disaster simulation is a challenge for HPC, because an analysis model is an urban area of a few kilometer dimension, which requires large-scale computation and automated model construction. In particular, a fast solver is implemented into a finite element method to solve the wave equation for a model of 100,000,000,000 degree-of-freedom, and a robust and flexible system is developed so that various digital data of an urban area are converted to a set of analysis models.