Observation of ULF emissions Associated with Earthquakes

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概要

• 論文の詳細を見る

• This paper presents a fractal analysis of the ULF electromagnetic data obtained at Guam observatory during a strong (Ms=8.0) earthquake occurred on August 8, 1993 near the Guam island. The chosen period covered four months before and two months after the earthquake. It was found that the spectrum of emissions at noon exhibited a power law behavior f^<-β> which is typical for self-organized critical dynamics. The slope of the spectrum in the noon and night sectors fluctuates in a range from 2.5 to 0.7 with a tendency to gradually decrease during the process of the earthquake preparation. We consider this to be a candidate for a precursory signature. We suggest that the focal zone was at the critical stage of self-organized criticality process before the quake, related to active microfracturing processes followed by the generation of ULF emissions as we detected.

• 社団法人電子情報通信学会の論文
• 1999-10-25

著者

• HAYAKAWA Masashi

  Department of Physics, Nagoya University

• ITO Tetsuya

  Department of Physics and Research Center for the Early Universe, The University of Tokyo

• Smirnova Natalia

  Institute Of Physics St.petersburg University

• ITOH Tetsuya

  Department of Electrical Engineering, Faculty of Scince and Technology, Keio University

• Hayakawa M

  Univ. Electro‐communications Chofu‐shi Jpn

• Hayakawa Masashi

  Department Of Electronic Engineering The University Of Electro-communications

• Ito Tetsuya

  Department Of Neonatology And Pediatrics Nagoya City University Graduate School Of Medical Sciences

• Ito T

  Univ. Electro‐communications Tokyo Jpn

• Ito Tetsuya

  Department Of Applied Chemistry Graduate School Of Science And Engineering Ehime University

• Ito Tetsuya

  Department Of Animal Science Obihiro University Of Agriculture And Veterinary Medicine

• Hayakawa Masashi

  Department Of Electronic Engineering And Research Station On Seismo Electromagnetics The University Of Electro-communications

• Hayakawa Masashi

  Department of Electronic Engineering, The University of Electro-Communications

• Itoh Tetsuya

  Department of Electrical Engineering, Faculty of Science and Technology, Keio University,

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