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Earth Planets Space, Vol. 56 (No. 3), pp. 359-365, 2004

Tsunami run-up heights of the 2003 Tokachi-oki earthquake

Yuichiro Tanioka1, Yuichi Nishimura1, Kazuomi Hirakawa2, Fumihiko Imamura3, Ikuo Abe3, Yoshi Abe3, Kazuya Shindou3, Hideo Matsutomi4, Tomoyuki Takahashi4, Kentaro Imai4, Kenji Harada5, Yuichi Namegawa6, Yohei Hasegawa7, Yutaka Hayashi7, Futoshi Nanayama8, Takanobu Kamataki8, Yoshiaki Kawata9, Yoshinobu Fukasawa9, Shunichi Koshimura9, Yasunori Hada9, Yusuke Azumai9, Kenji Hirata10, Akiyasu Kamikawa11, Akifumi Yoshikawa11, Toru Shiga11, Masaki Kobayashi11, and Seiichi Masaka12

1Institute of Seismology and Volcanology, Hokkaido University, N10W8 Kita-ku, Sapporo 060-0810, Japan
2Graduate School of Environmental Earth Science, Hokkaido University, N10W5 Kita-ku, Sapporo 060-0810, Japan
3Disaster Control Research Center, Graduate School of Engineering, Tohoku University, Aoba 06, Sendai 980-8579, Japan
4Department of Civil and Environmental Engineering, Faculty of Engineering and Resource Science, Akita University, 1-1 Tegatagakuen, Akita 010-8502, Japan
5Disaster Prevention Research Institute, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
6Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan
7Seismology and Volcanology Research Department, Meteorological Research Institute, 1-1 Nagamine, Tsukuba 305-0052, Japan
8National Institute of Advanced Industrial Science and Technology, Site C7 1-1-1 Higashi, Tsukuba 305-8567, Japan
9Disaster Reduction and Human Renovation Institution, 1-5-2 Wakinohama kaigan-dori, Chuo-ku, Kobe 651-0073, Japan
10Deep Sea Research Department, Japan Marine Science and Technology Center, 2-15 Natsuhima-cho, Yokosuka 237-0061, Japan
11Sapporo District Meteorological Observatory, N2W18, Cyuou-ku, Sapporo 060-0002, Japan
12Japan Meteorological Agency, 1-3-4 Otemachi, Chiyoda-ku, Tokyo 100-8122, Japan

(Received November 28, 2003; Revised March 2, 2004; Accepted March 2, 2004)

Abstract: Tsunami height survey was conducted immediately after the 2003 Tokachi-oki earthquake. Results of the survey show that the largest tsunami height was 4 m to the east of Cape Erimo, around Bansei-onsen, and locally at Mabiro. The results also show that the tsunami height distribution of the 2003 Tokachi-oki earthquake is clearly different from that of the 1952 Tokachi-oki earthquake, suggesting the different source areas of the 1952 and 2003 Tokachi-oki earthquakes. Numerical simulation of tsunami is carried out using the slip distribution estimated by Yamanaka and Kikuchi (2003). The overall pattern of the observed tsunami height distribution along the coast is explained by the computed ones although the observed tsunami heights are slightly smaller. Large later phase observed at the tide gauge in Urakawa is the edge wave propagating from Cape Erimo along the west coast of the Hidaka area.
Key words: The 2003 Tokachi-oki earthquake, tsunami height survey, tsunami numerical simulation, edge wave.


Corresponding author E-mail: tanioka@eos.hokudai.ac.jp


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