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Representation and Analysis of the Earthquake Size Distribution: A Historical Review and Some New Approaches

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Seismicity Patterns, their Statistical Significance and Physical Meaning

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

The size distribution of earthquakes has been investigated since the early 20th century. In 1932 WADATI assumed a power-law distributionn(E) = kE —wfor earthquake energyEand estimated the w value to be 1.7 ~ 2.1. Since the introduction of the magnitude-frequency relation by GUTENBERG and RICHTER in 1944 in the form of logn(M) = a — bMthe spatial or temporal variation (or stability) ofbvalue has been a frequently discussed subject in seismicity studies. The logn(M)versusMplots for some data sets exhibit considerable deviation from a straight line. Many modifications of the G-R relation have been proposed to represent such character. The modified equations include the truncated G-R equation, two-range G-R equation, equations with various additional terms to the original G-R equation. The gamma distribution of seismic moments is equivalent to one of these equations.

In this paper we examine which equation is the most suitable to magnitude data from Japan and the world using AIC. In some cases, the original G-R equation is the most suitable, however in some cases other equations fit far better. The AIC is also a powerful tool to test the significance of the difference in parameter values between two sets of magnitude data under the assumption that the magnitudes are distributed according to a specified equation. Even if there is no significant difference inbvalue between two data sets (the G-R relation is assumed), we may find a significant difference between the same data sets under the assumption of another relation. To represent a character of the size distribution, there are indexes other than parameters in the magnitude-frequency distribution. Thenvalue is one of such numbers. Although it is certain that these indexes vary among different data sets and are usable to represent a certain feature of seismicity, the usefulness of these indexes in some practical problems such as foreshock discrimination has not yet been established.

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Authors and Affiliations

  1. University of Tokyo and Institute of Statistical Mathematics, Tokyo, Japan

    Tokuji Utsu

  2. University of Tokyo and Institute of Statistical Mathematics, 9-5-18 Kitami, Setagaya-ku, Tokyo, 157-0067, Japan

    Tokuji Utsu

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  1. Tokuji Utsu
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  1. Geophysical Institute, University of Alaska, Fairbanks, USA

    Max Wyss

  2. Earthquake Research Institute, University of Tokyo, Tokyo, Japan

    Kunihiko Shimazaki

  3. University of Utsunomiya, Utsunomiya, Tochigi, Japan

    Akihiko Ito

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Utsu, T. (1999). Representation and Analysis of the Earthquake Size Distribution: A Historical Review and Some New Approaches. In: Wyss, M., Shimazaki, K., Ito, A. (eds) Seismicity Patterns, their Statistical Significance and Physical Meaning. Pageoph Topical Volumes. Birkhäuser, Basel. https://doi.org/10.1007/978-3-0348-8677-2_15

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  • DOI: https://doi.org/10.1007/978-3-0348-8677-2_15

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