Field Survey of the 2003 Tokachi-Oki Earthquake Tsunami and Simulation at the Ootsu Harbor Located at the Pacific Coast of Hokkaido, Japan
Field survey for the 2003 Tokachi-oki earthquake tsunami was conducted by the scientists from all over Japan [Tanioka et al., 2004a, b]. Large tsunami heights of about 4 m were observed at Hyakuninhama to the east of Cape Erimo and along the beach between Horokayanto and Oikamanai. Those places are close to the source region of the earthquake. In general, tsunami heights gradually decreased to the east and to the west away from those two locations except at Mabiro where a large tsunami height of about 4m was locally observed. The most intensive tsunami survey was conducted at the Ootsu harbor. The survey results indicate that the quay of the harbor was completely submerged by the tsunami, but the road around the harbor was not. Numerical computation of the 2003 Tokachi-oki tsunami was carried out by solving the nonlinear shallow water equations with a moving boundary condition near the Ootsu harbor. The computed tsunami at the Ootsu harbor well explains the above observations.
Key wordsThe 2003 Tokachi-oki tsunami tsunami survey tsunami numerical simulation
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- Hamada, N., and Y. Suzuki: 2004, Re-examination of aftershocks of the 1952 Tokachi-oki earthquake and a comparison with those of the 2003 Tokachi-oki earthquake, Earth Planets Space, 56, 341–345.Google Scholar
- Honda, R., S. Aoi, N. Morikawa, H. Sekiguchi, T. Kunugi, H. Fujiwara: 2004, Ground motion and rupture process of the 2003 Tokachi-oki earthquake obtained from strong motion data of K-NET and KIK-net, Earth Planets Space, 56, 317–322.Google Scholar
- Ichiyanagi, M., H. Takahashi, and M. Kasahara: 2004, Aftershock activity of the 2003 Tokachi-oki earthquake (MJMA=8.0), Geophysical Bulletin of Hokkaido University, 64, 347–357 (in Japanese).Google Scholar
- Koketsu, K., K. Hikima, S. Miyazaki, and S. Ide: 2004, Joint inversion of strong motion and geodetic data for the source process of the 2003 Tokachi-oki, Hokkaido, earthquake, Earth Planets Space, 56, 329–334.Google Scholar
- Okada, Y.: 1985, Surface deformation due to shear and tensile faults in a half-space Bull. Seismol. Soc. Am., 75, 1135–1154.Google Scholar
- Tanioka, Y., and Satake, K: 1995, Tsunami runup on Okushiri Island, in Yeh, H., P. Liu and C. Synolakis (eds.) Long-Wave Models, World Scientific, 249–257.Google Scholar
- Tanioka, Y. et al., 2004a, Tsunami run-up heights of the 2003 Tokachi-oki earthquake, Earth Planets Space, 56, 359–365.Google Scholar
- Tanioka, Y. et al., 2004b, The report of the survey of the 2003 Tokachi-oki tsunami, Tsunami Engineering of Tohoku University, 21, part 2, 1–237 (in Japanese).Google Scholar
- Tanioka, Y., K. Hirata, R. Hino, and T. Kanazawa: 2004c, Slip distribution of the 2003 Tokachi-oki earthquake estimated from tsunami waveform inversion, Earth Planets Space, 56, 373–376Google Scholar
- Yagi, Y.: 2004, Source rupture process of the 2003 Tokachi-oki earthquake determined by joint inversion of teleseismic body wave and strong ground motion data, Earth Planets Space, 56, 311–316.Google Scholar
- Yamanaka, K., and M.. Kikuchi: 2003, Source processes of the Toachi-oki earthquake on September 26, 2003, inferred from teleseismic body waves, Earth Planets Space, 55, e21–e24.Google Scholar