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1996 Fiscal Year Final Research Report Summary

Scaling laws of AE events in rocks

Research Project

Project/Area Number 07651154
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 資源開発工学
Research InstitutionKYOTO UNIVERSITY (1996)
Nihon University Junior College (1995)

Principal Investigator

YANAGIDANI Takashi  Kyoto Univ., RCEP DPRI,Associate Prof., 防災研究所, 助教授 (00259128)

Co-Investigator(Kenkyū-buntansha) YOSHINO Takashi  Toyo Univ., Engineering, Lecturer, 工学部, 講師 (60269496)
TSUKADA Kazuhiko  Kyoto Univ., Engineering, Associate Prof., 大学院・工学研究科, 助教授 (10179971)
Project Period (FY) 1995 – 1996
KeywordsAcoustic Emission / Scaling law / Power law
Research Abstract

The frequency-magnitude distribution of AE events in rocks was found to obey the powerlaw, which is just the case of natural earthquakes. These conventional results, however, must be examined using more sophisticated measurement system, because they are concluded without observing actual waveforms, and the narrow dynamic range of monitoring system also limits the validity of these findings, In this study, we have tried to acquire the complete waveforms of AE events during the main fracture under uniaxial compression by newly developed monitoring system with wider dynamic range. The 6 preamplifiers (whose frequency response is from 1.5 kHz to 20 MHz) are combined to get dynamic range of 4^<1h> order (i.e. *2 mVpp-*2 Vpp referred to input). Four serial outputs of preamplifiers are digitized by high-speed AID converters (5 MS/s) with high resolution (12 bit). The digitized waveforms of AE events are stored within a long memory, which make it possible to analyze AE events up to 2 seconds in terms of complete waveforms. The frequency-magnitude distribution of AE events is observed to obey power law and to be self-similar in even wider amplitude range, which is consistent with conventional findings, On the other hand, other type of scaling law such as maximum amplitude vs. dominant frequency, which is clearly seen in the case of natural earthquakes, does not hold in the case of AE events. That means the similarity between nature earthquakes and AE events are very limited. The tears of scaling law in AE events are problematic and mysterious, and to solve this will lead to full understanding as to what is AE events.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] Kawakata et.al.,: "The observation of faulting in westerly granite under triaxial compression by X-ray CT Scan" Int.J.Rock Mech. Min. Sci. 34. 375 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kiyama et.al.,: "Permeability in anisotropic granite under hydrostatic compression including post-failure region" Proc.2nd North American Rock Mechanics Sympsium : NARMS'96. 2. 1643-1650 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yoshino, T.: "Influence of crustal viscosity on earthquake energy distribution in a viscoelastic spring-block model" Geophysical Res. Lett.25. 3643-3646 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yanagidani,et.al.: "AE monitoring in the site-investigation tunnel at the Mozumi Fault" International Workshop on Frontiers in Monitoring Science and Technology for Earthquake Environment. 1. FP10 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kawakata, H., A.Cho, T.Yanagidani, and M.Shimada: "The Observations of faulting In Westerly granite under triaxial compression by X-ray CT scan" Int.J.Rock Mech.Min.Sci. (Paper No.151 on CD-ROM). 34,3-4. 375 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kiyama, T., H.Kita, Y.Ishijima, T.Yanagidani, K.Aoki, T.Sato: "Permeability in anisotropic granite under hydrostatic Compression Including post-failure region" Proc.Second North American Rock Mechanics Symposium : NARMS'96, "Rock Mechanics Tools and Techniques" edited by M.Auertin, F.Hassani, H.Mitri.1643-1650 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yoshino, T.: "Influence of crustal viscosity on earthquake energy distribution in a viscoelastic spring-block model" Geophysical Res.Lett.25. 3643-3646 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yanagidani, T., M.Teshima, and F.Yamashita: "AE monitoring in the site-investigation tunnel at the Mozumi Fault-Preliminary monitoring of ongoing stress-related process in the close vicinity of Mozumi Fault" International Workshop on Frontires in Monitoring Sciences and Technology for Earthquake Environments, at Tono Geoscience Center, JNC. (1998)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-12-08  

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