- Open Access
A Characteristic Change in Fractal Dimension Prior to the 2003 Tokachi-oki Earthquake (M J = 8.0), Hokkaido, Northern Japan
Earth, Planets and Space volume 56, pages401–405(2004)
Changes in form of hypocenter distribution preceding the 2003 Tokachi-oki Earthquake (M J = 8.0) were investigated by using the analysis of temporal variation in spatial fractal dimension D. In this study, it was found that the D value began to decrease in 1998, and had been very small for about one year before the main shock occurrence. Such a D decrease before the main shock occurrence is a characteristic of some recent large earthquakes. Therefore, the D decrease may be an earthquake precursor. The D value decrease is yielded by both of seismic activation and quiescence which have often been reported as an earthquake precursor, due to a property of the calculation method. Therefore, the D change can be detected, even if the seismic activation and quiescence occur simultaneously in which case the number of earthquakes does not change significantly. On account of this property, using the D value is advantageous to detect the precursory change of seismic activity before a large earthquake.
Enescu, B. and K. Ito, Some premonitory phenomena of the 1995 Hyogo-Ken Nanbu (Kobe) earthquake: seismicity, b-value and fractal dimension, Tectonophysics, 338, 297–314, 2001.
Grassberger, P., Generalized dimension of strange attractors, Phys. Lett. A, 97, 227–230, 1983.
Grassberger, P. and I. Procaccia, Measuring the strangeness of strange at-tractors, Physica D, 9, 189–208, 1983.
Kagan, Y. Y. and L. Knopoff, Spatial distribution of earthquakes: the two-point correlation function, Geophys. J. R. astr. Soc., 62, 303–320, 1980.
Murase, K., The Characteristic Changes in Fractal Dimension Preceding the 2000 Tottori-ken Seibu Earthquake (MJ = 7.0), Zisin 2, 55, 11–18, 2002(in Japanese with English abstract).
Odaka, T. and K. Maeda, Changes in Seismic Activities in the the Focal Region and Nearby Seismic Nests before the 1987 Chiba-toho-oki Earthquake, Zisin 2, 47, 365–374, 1994(in Japanese with English abstract).
Wiemer, S. and M. Wyss, Seismic quiescence before the Landers (M = 7.5) and Big Bear (M = 6.5) 1992 earthquakes, Bull. Seism. Soc. Am., 84, 900–916, 1994.
About this article
Cite this article
Murase, K. A Characteristic Change in Fractal Dimension Prior to the 2003 Tokachi-oki Earthquake (M J = 8.0), Hokkaido, Northern Japan. Earth Planet Sp 56, 401–405 (2004). https://doi.org/10.1186/BF03353072
- The 2003 Tokachi-oki Earthquake
- hypocenter distribution
- fractal dimension
- precursory change