Numéro
J. Phys. I France
Volume 6, Numéro 10, October 1996
Page(s) 1391 - 1402
DOI https://doi.org/10.1051/jp1:1996143
DOI: 10.1051/jp1:1996143
J. Phys. I France 6 (1996) 1391-1402

Discrete Scaling in Earthquake Precursory Phenomena: Evidence in the Kobe Earthquake, Japan

Anders Johansen1, Didier Sornette1, Hiroshi Wakita2, Urumu Tsunogai2, William I. Newman3 and Hubert Saleur4

1  Laboratoire de Physique de la Matière Condensée CNRS URA 190, Université de Nice-Sophia Antipolis, Parc Valrose, 06108 Nice Cedex, France
2  Laboratory for Earthquake Chemistry, Faculty of Science, University of Tokyo Bunkyo-Ku, Tokyo, Japan
3  Departments of Earth and Space Sciences, Physics and Astronomy, and Mathematics, University of California, Los Angeles, CA 90095, USA
4  Departments of Physics and Astronomy, and Mathematics, University of Southern California, Los Angeles, CA 90089-0484, USA



(Received 12 February 1996, revised 23 April 1996, accepted 6 June 1996)

Abstract
We analyze the ion concentration of groundwater issuing from deep wells located near the epicenter of the recent earthquake of magnitude 6.9 near Kobe, Japan, on January 17, 1995. These concentrations are well fitted by log-periodic modulations around a leading power law. The exponent (real and imaginary parts) is very close to those already found for the fits of precursory seismic activity for Loma Prieta and the Aleutian Islands. This brings further support for the general hypothesis that complex critical exponents are a general phenomenon in irreversible self-organizing systems and particularly in rupture and earthquake phenomena.

Résumé
Nous analysons les fluctuations de concentrations ioniques de l'eau issue de puits profonds situés à proximité de l'épicentre du récent tremblement de terre de magnitude 6.9 proche de Kobe au Japon, le 17 janvier 1995. Ces fluctuations sont bien reproduites par des modulations log-périodiques autour d'une loi de puissance. Les parties réelle et imaginaire de l'exposant sont très proches de celles trouvées précédemment pour les tremblements de terre de Loma Prieta et des Iles Aléoutiennes. Ces résultats renforcent l'hypothèse que des exposants critiques complexes sont une propriété générale des phénomènes de croissance irréversible, et en particulier des problèmes de rupture et des tremblements de terre.



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