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Phases Representing Source Lengths of Tsunami in Tide Gauge Records

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Tsunami and Its Hazards in the Indian and Pacific Oceans

Part of the book series: Pageoph Topical Volumes ((PTV))

Abstract

We identified a phase representing the source length of tsunami’s in the tide gauge records around Japan. This phase was observed at tide stations, located in the direction of the long axis of the sources, for four large tsunamis: 1964 Niigata, 1968 Tokachi-oki, 1983 Nihonkaichubu, and 1993 Hokkaido-nanseioki. The phase consists of two continuous crests starting as the initial arrival and has a time length of 15–47 minutes. This is the time required to propagate across the source area along the long axis. Strong evidence that the phase is generated at the source is the good correlation between waveform observed at one side and time-inversed waveform at another side. The correlation results from the instantaneous generation of the source. The source lengths of 74–254 km were obtained under an assumption of sea depths at the sources and verified to coincide with ones within a relative error of 15% that were previously obtained by other methods.

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Author information

Authors and Affiliations

  1. Niigata Junior College, Nippon Dental University, Hamauracho 1-8, Niigata City, 951-8580, Japan

    Kuniaki Abe

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  1. Kuniaki Abe
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Editor information

Editors and Affiliations

  1. National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan, Tsukuba, 305-8567, Japan

    Kenji Satake

  2. Department of Earth and Planetary Sciences, Northwestern University, Evanston, Illinois, 60208-2150, USA

    Emile A. Okal

  3. Viterbi School of Engineering Civil and Environmental Engineering, University of Southern California, USA

    José C. Borrero

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© 2007 Birkhaüser Verlag, Basel

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Abe, K. (2007). Phases Representing Source Lengths of Tsunami in Tide Gauge Records. In: Satake, K., Okal, E.A., Borrero, J.C. (eds) Tsunami and Its Hazards in the Indian and Pacific Oceans. Pageoph Topical Volumes. Birkhäuser Basel. https://doi.org/10.1007/978-3-7643-8364-0_10

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