Propagating tsunami wave and subsequent resonant response signals detected by HF radar in the Kii Channel,Japan |
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| Authors: | Hirofumi Hinata Satoshi Fujii Keita Furukawa Tomoya Kataoka Masafumi Miyata Takashi Kobayashi Masahiro Mizutani Takahiro Kokai Nobuyoshi Kanatsu |
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| Institution: | 1. Coastal Zone Systems Division, Coastal and Marine Department, National Institute for Land and Infrastructure Management, 3-1-1 Nagase, Yokosuka, Kanagawa 2390826, Japan;2. Department of Electrical and Electronics Engineering, University of the Ryukyus, 1 Senbaru, Nishihara, Okinawa 9030213, Japan;3. Marine Environment Division, Coastal and Marine Department, National Institute for Land and Infrastructure Management, 3-1-1 Nagase, Yokosuka, Kanagawa 2390826, Japan;4. Ports and Harbors Bureau, Ministry of Land, Infrastructure, Transport and Tourism, 2-1-3 Kasumigaseki, Chiyoda-ku, Tokyo 1008918, Japan;5. Kinki Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism, 1-5-44 Otemachi, Chuo-ku, Osaka 5408586, Japan;6. Nagano Japan Radio Co., Ltd., 1163 Inasato-machi Shimohigano, Nagano, Nagano 3812288, Japan;g Kokusai Kogyo Co., Ltd., 2 Rokubancho, Chiyoda-ku, Tokyo 1020075, Japan |
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| Abstract: | Signals from the tsunami waves induced by the March 11, 2011 moment magnitude (Mw) 9.0 Tohoku-Oki earthquake and from subsequent resonances were detected as radial velocity variability by a high-frequency ocean surface radar (HF radar) installed on the eastern coast of the Kii Channel, at a range of about 1000 km from the epicenter along the eastern to southern coasts of Honshu Island. A time–distance diagram of band-passed (9–200 min) radial velocity along the beam reveals that the tsunami waves propagated from the continental shelf slope to the inner channel as progressive waves for the first three waves, and then natural oscillations were excited by the waves; and that the direction of the tsunami wave propagation and the axis of the natural oscillations differed from that of the radar beam. In addition, spectral analyses of the radial velocities and sea surface heights obtained in the channel and on the continental shelf slope suggest complex natural oscillation modes excited by the tsunami waves. |
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| Keywords: | tsunamis radar oceanography resonance oscillatory flow Japan Kii channel |
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