Regional Variation of the Formulae for the Determination of Tsunami Magnitude in and around Japan

• WATANABE Hideo

  Tohoku Head Office, Japan Weather Association

Bibliographic Information

Other Title

• 日本近海で発生した津波のマグニチュード決定式の地域性
• ニホン キンカイ デ ハッセイシタ ツナミ ノ マグニチュード ケッテイシキ

Abstract

Previous equation for the tsunami-magnitude scale after Abe (1981) has been re-examined using a more general form: M₁₀=logA+a log Δ+b, where M_to is tsunami magnitude, A is the maximum double amplitude of tsunami as recorded on a tide gage, Δ is the shortest distance along oceanic path from the earthquake epicenter to a tide station, and a and b are constants. A_BE (1981) used a=1 and b=5.55 in his determination of tsunami magnitude. This paper demonstrates, using more extensive sets of tide records, that the constants, a and b, vary regionally. For instance, a=0.86 and b=5.96 for tsunamis along the Pacific coasts in and around Japan, and a=0.52 and b=6.56 for tsunamis in the Japan Sea. These constants vary even in more regional scales and may depend on the submarine topography along a tsunami path. Renewed equations should be used for the determination of tsunami magnitude.

Journal

• Zisin (Journal of the Seismological Society of Japan. 2nd ser.)

  Zisin (Journal of the Seismological Society of Japan. 2nd ser.) 48 (2), 271-280, 1995

  SEISMOLOGICAL SOCIETY OF JAPAN

Keywords

• Tsunami magnitude
• Japanese tsunami

Details

• CRID: 1390001204306449664
• NII Article ID: 10002499737
• NII Book ID: AN00305741
• DOI: 10.4294/zisin1948.48.2_271
• ISSN: 18839029
• ISSN: 2186599X
• ISSN: 00371114
• NDL BIB ID: 3623873
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3623873
• Web Site: https://www.jstage.jst.go.jp/article/zisin1948/48/2/48_2_271/_pdf
• Data Source:
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  • CiNii Articles
• Abstract License Flag: Disallowed