Detailed Session Information

Session 3.1:

Macroscopic methods (FEM, FD, PS, SE) of earthquake faulting and waves

Convenors: K. Hirahara (Japan), D. Komatitsch (USA)


Session Overview: Kazuro Hirahara, Nagoya University (15 minutes)

Numerical simulation of earthquake faulting and wave propagation in 
realistic media, that include laterally heterogeneous elastic and 
viscoelastic complexity with several scales, requires highly 
sophisticated numerical techniques. The objective of this session 3.1 is 
to study computational methods and algorithms for the simulation models, 
common tools and routines for their implementation on super-parallel 
computer systems for large-scale problems, discussion of efficient 
methods for mesh design in 3D for real structures, and visualization and 
evaluation strategy of simulation results. We examine the present status 
in this subject and discuss future directions. In this session, we would 
like to explore the following three issues:
  1. Towards large-scale computing
  2. Towards more realistic simulation of earthquake cycle and earthquake faulting
  3. Towards realistic simulation of wave propagation in large-scale complex media

1. Towards large-scale computing:

For large-scale problems with typically 100 million degrees of freedom 
or more, special simulation techniques are required, especially when 
using parallel computers. These new techniques are discussed and analyzed.

2. Towards more realistic simulation of earthquake cycle and earthquake faulting:

We discuss technical problems related to the quasi-static simulation of 
earthquake cycle on plate interfaces and inland faults due to relative 
plate motions, which are in particular the introduction and correct 
representation of the fault interface, the allowance of a large amount 
of slip on the interface, the implementation of friction laws, anelastic 
properties, and so on.  Problems related to dynamic simulation of 
earthquake faulting are also examined.

3. Towards realistic simulation of wave propagation in large-scale complex media:

As observed for instance during the 1995 Kobe earthquake, abnormally 
strong ground motion, which is caused by the interaction of complex 
surface structure and waves emitted from the propagating rupture of 
earthquake faulting, causes great disaster.  We discuss technical 
problems related to realistic simulation of wave propagation in such 
basin structures, as well as in faulting regions.

Session Plenary: (1 Hour)

Genki Yagawa, Hiroshi Okuda, and Hisashi Nakamura  
(30 minutes, including. 10 minutes discussion)
Development of High-Performance Parallel Finite Element System for 
Solid Earth -GeoFEM Project

Jacobo Bielak and Omar Ghattas  
(30 minutes, including 10 minutes for discussion)
Computational Challenges in Seismology

Detailed Session: (2.5 Hours)

1. Towards large-scale computing

Kazuteru Garatani  (15 minutes)
Feasibility Study of GeoFEM for Solving 100 Million DOF Problems

Kengo Nakajima  (15 minutes)
Convergence Acceleration Method of Large-Scale Parallel Iterative 
Solvers for Heterogeneous Properties

Comments and discussions (20 minutes)

2. Towards more realistic simulation of earthquake cycle 
and earthquake faulting

Kazuro Hirahara  (15 minutes)
Quasi-static simulation of seismic cycle of great inter-plate 
earthquakes following a friction law in laterally heterogeneous 
viscoelastic medium under gravitation - FEM Approach

Z. Guo, A. Makinouchi, and T.Fujimoto  (15 minutes)
FEM Simulation of Dynamic Sliding of Faults Connecting Static 
Deformation Process to Dynamic Process

Mikio Iizuka  (15 minutes)
Nonlinear Structural Subsystem of GeoFEM for Fault Zone Analysis

Comments and discussions (20 minutes)

3. Towards realistic simulation of wave propagation 
in large-scale complex media

Dimitri Komatitsch, Christophe Barnes, and Jeroen Tromp (15 minutes)
A spectral element method for wave propagation simulation applied to 
3D basins, and to a fluid-solid interface

Comments and discussions (20 minutes)