Special Issue: Special Section for the 2004 off the Kii peninsula earthquakes (1)
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Long-period ground motion simulation in the Kinki area during the MJ 7.1 foreshock of the 2004 off the Kii peninsula earthquakes
Earth, Planets and Space volume 57, pages 197–202 (2005)
Long-period (5–20 s) ground motion simulations in the Kinki area during the MJ 7.1 foreshock of the 2004 off the Kii peninsula earthquakes are performed. We construct a three-dimensional underground structure model that includes the source region and Osaka basin area to confirm propagation-path effects of crustal structure on long-period ground motions. Finite difference (FD) simulations by our three-dimensional underground structure model agree well with long-period observed ground motions at several rock sites in the Kinki area. We found that a sedimentary wedge structure along the Nankai trough amplifies and elongates long-period ground motions from this event. We also examine the effect of source depth for this event by comparing the observed with synthetic waveforms. These results suggest that precise modeling of the shallower parts of the underground structure, such as the sedimentary wedge, are quite important for long-period ground motion simulation of the hypothetical Nankai and Tonankai earthquakes.
Coffin, M. and N. Hirata, Large earthquake strikes Hokkaido, Japan, EOS Trans. AGU, 84, 442, 2003.
Furumura, T., B. L. N. Kennett, and K. Koketsu, Visualization of 3D wave propagation from the 2000 Tottori-ken Seibu, Japan, Earthquake: Observation and numerical simulation, Bull. Seism. Soc. Am., 93, 870–881, 2003.
Graves, R. W., Simulating seismic wave propagation in 3D elastic media using staggered-grid finite differences, Bull. Seism. Soc. Am., 86, 1091–1106, 1996.
Hayakawa, T., T. Furumura, and Y. Yamanaka, Simulation of strong ground motions caused by the 2004 off the Kii peninsula earthquakes, Earth Planets Space, 57, this issue, 191–196, 2005.
Iwata, T., K. Asano, N. Yamada, and W. Suzuki, Long-period ground motion characteristics in Osaka basin during the 2004 Kii-Hanto-Nanto-Oki earthquake, Ann. Meeting of Seism. Soc. Japan, PK21, 2004 (in Japanese).
Japan Meteorological Agency, Monthly report on earthquake and volcanoes in Japan, December 2004, 142 pp., 2004 (in Japanese).
Kagawa, T., B. Zhao, K. Miyakoshi, and T. Akazawa, A procedure of modeling basin structure used for trong ground motion evaluation from any amount of given information—Case study for the Osaka basin, Proc. 11th Japan Earthquake Engineering Symposium, 497–500, 2002 (in Japanese).
Koketsu, K., K. Hatayama, T. Furumura, Y. Ikegami, and S. Akiyama, Damaging long-period ground motions from the 2003 Mw 8.3 Tokachioki, Japan, earthquake, Seism. Res. Lett., 76, 58–64, 2005.
Miyake, H. and K. Koketsu, Long-period ground motions from a large off-shore earthquake: The case of the 2004 off the Kii peninsula earthquake, Japan, Earth Planets Space, 57, this issue, 203–207, 2005.
Nakamura, M., H. Watanabe, T. Konomi, S. Kimura, and K. Miura, Characteristics activities of subcrustal earthquakes along the outer zone of southwestern Japan, Annuals of Disas. Prev. Res. Inst., Kyoto Univ., 40 B1, 1–20, 1997 (in Japanese).
Nakanishi, A., N. Takahashi, J. Park, S. Miura, S. Kodaira, Y. Kaneda, N. Hirata, T. Iwasaki, and M. Nakamura, Crustul structure across the coseismic rupture zone of the 1944 Tonankai earthquake, the central Nankai Trough seismogenic zone, J. Geophys. Res., 107, doi:10.1029/2001JB000424, 2002.
Obana, K., S. Kodaira, Y. Kaneda, K. Mochizuki, M. Shinohara, and K. Suyehiro, Microseismicity at the seaward updip limit of the western Nanki Trough seismogenic zone, J. Geophys. Res., 108, 2459, doi:10.1029/2002JB002370, 2003.
Yagi, Y., http://iisee.kenken.go.jp/staff/yagi/eq/Japan20040905/Japan20040905_1-j.html, 2004 (in Japanese).
Yamada, N. and T. Iwata, Long-period ground motion simulation in Kinki area, Annals of Disas. Prev. Res. Inst., Kyoto Univ., 47 C, 149–155, 2004.
Yamada, N. and H. Yamanaka, Comparison of performance of 3D subsurface structural models in the southern part of the Kanto plain for strong ground motion—Examination using an earthquake (MJMA 4.1) in the west of Kanagawa prefecture of May 22, 1999, Zisin (J. Seism. Soc. Japan), 53, 313–324, 2001 (in Japanese).
Wessel, P. and W. H. F. Smith, New version of the generic mapping tools released, EOS Trans. AGU, 76, 329, 1995.
Zhao, D., A. Hasegawa, and H. Kanamori, Deep structure of Japan subduction zone as derived from local, regional, and teleseismic events, J. Geophys. Res., 99, 22313–22329, 1994.
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Yamada, N., Iwata, T. Long-period ground motion simulation in the Kinki area during the MJ 7.1 foreshock of the 2004 off the Kii peninsula earthquakes. Earth Planet Sp 57, 197–202 (2005). https://doi.org/10.1186/BF03351815
- Long-period ground motion simulation
- foreshock of the 2004 off the Kii peninsula earthquakes
- Kinki area
- underground structure model