Last Update 11/06 2014
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 H. Takenaka, Parallel 3-D pseudospectral simulation of wave propagation, Geophysics, 63, 279--288, 1998. 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 B.L.N. Kennett, On the nature of regional seismic phases -III. The influence of crustal heterogeneity on the wavefield for subduction earthquakes: the 1985 Michoacan and 1995 Copala, Guerrero, Mexico earthquakes, Geophys. J. Int., 135, 1060--1084, 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, M., B.L.N. Kennett, and T. Furumura, Seismic wavefield calculation for laterally heterogeneous earth models-II. The influence of upper mantle heterogeneity, Geophys. J. Int., 139, 623--644, 1999. Furumura, T., and K. Koketsu, Parallel 3-D simulation of ground motion for the 1995 Kobe earthquake: The component decomposition approach, Pure Appl. Geophys., 157, 1921--1936, 2000. 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. and S.K Singh, Regional wave propagation from Mexican subduction zone earthquakes: The attenuation functions for interplate and inslab events, Bull. Seism. Soc. Am., 92, 6, 2110--2125, 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. Furumura, T. and B.L.N.Kennett, A scattering waveguide in the heterogeneous subducting plate, Advances in Geophysics, Scattering of Short-Period Seismic Waves in Earth Heterogeneity, Eds. H Sato and M. Fehler, Elsevier, 50, Chap.7, 195--217, 2008. Furumura, T., K. Imai, and T. Maeda, A revised tsunami source model for the 1707 Hoei earthquake and simulation of tsunami inundation of Ryujin Lake, Kyushu, Japan, J. Geophys. Res., 116, doi:10.1029/2010JB007918, , 2011. Furumura, T., S. Takemura, S. Noguchi, T. Takemoto, T. Maeda, K. Iwai, and S. Padhy, Strong Ground Motions from the 2011 Off- the Pacific- Coast- of- Tohoku, Japan (Mw=9.0) Earthquake Obtained from a Dense Nation-wide Seismic Network, Landslides, 8, 3, 333--338, 2011. Furumura, T.,, Radiation and development of short- and long-period ground motions from the 2011 Off Tohoku, Japan, Mw9.0 Earthquake, Journal of Disaster Research, in press, , 2014. Furumura, T., T.-K. Hong, BLN Kennett, Lg wave propagation in the area around Japan: Observation and simulation, Progress of Earth. Planet. Sci., 1, in press, , 2014. |