Last Update 09/23 2009
Research: The seismic wavefield is significantly affected by 3D variations in crustal structure both in the source zone itself and in propagation to some distance, and such effects can be modeled by large-scale numerical 3D simulation of seismic wavepropagation by using powerful computers. We are developing a hybrid parallel simulation code with pseudospectral representation for horizontal coordinates and finite-difference in depth. This arrangement improves parallel efficiency with high speed-up rate using large number of processors on a parallel computer. Using this, numerical modeling of strong ground motion with a realistic 3D structural model has been conducted to represent the wave propagation from destructive earthquakes such as the 1995 Kobe earthquake and 1999 Chi-Chi, Taiwan earthquake. In order to understand the process of strong ground motion generation during the damaging earthquakes, we are also keen on the visualization of seismic wave field. Publications: Furumura T. and H. Takenaka, 2.5-D modeling of elastic waves using the pseudospectral method, Geophys. J. Int., 124, 820--832, 1995. Furumura T., B.L.N. Kennett and M. Furumura, Seismic wavefield calculation for laterally heterogeneous spherical earth models using the pseudospectral method, Geophys. J. Int., 135, 845--860, 1998. Furumura T. and K. Koketsu, Specific distribution of ground motion during the 1995 Kobe earthquake and its generation mechanism, Geophys. Res. Lett., 25, 785--788, 1998. Furumura T. and B.L.N.Kennett, Variation in Regional Phase Propagation in the Area around Japan, Bull. Seism. Soc. Am., 91, 4, 667--682, 2001. Furumura, T., K. Koketsu and K.-L. Wen, Parallel PSM/FDM hybrid simulation of ground motions from the 1999 Chi-Chi, Taiwan earthquake, Pure Appl. Geophys., 159, 2133--2146, 2002. Furumura, T., B.L.N. Kennett and K. Koketsu, Visualization of 3-D wave propagation from the 2000 Tottori-ken Seibu, Japan earthquake: Observation and numerical simulation, Bull. Seism. Soc. Am., 91, 4, 667--682, 2003. Furumura, T. and BLN. Kennett, Subduction zone guided waves and the heterogeneity structure of the subducted plate: Intensity anomalies in northern Japan, J. Geophys. Res., 110, 10, doi: B1030, , 2005. Furumura, T. and T. Hayakawa, Anomalous propagation of long-period ground motions recorded in Tokyo during the 23 October 2004 Niitgata-ken Chuetsu (Mw6.6) earthquake, Japan, Bull. Seism. Soc. Am., 97, 3, 863--880, 2007. Furumura, T. Hayakawa, M. Nakamura, K. Koketsu, and T. Baba, Development of long-period ground motions from the Nankai Trough, Japan, earthquakes: Observations and computer simulation of the 1944 Tonankai (Mw8.1) and the 2004 SE Off-Kii Peninsula (Mw7) Earthquakes, Pure Appl. Geophys., 165, 3, 585--607, 2008. |
