Attenuation behaviour of tuffaceous sandstone and granite during microfracturing

Angelika M. Wulff, Toshiyuki Hashida, Kimio Watanabe, Hideaki Takahashi

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

Laboratory measurements of ultrasonic wave propagation in tuffaceous sandstone (Kimachi, Japan) and granite (Iidate, Japan) were performed during increasing fracturing of the samples. The fracturing was achieved by unconfined uniaxial compression up to and beyond the point of macrofracture of the specimen using a constant low strain rate. The observed variation of wave velocity (up to 40 per cent) due to the development of micro- and macrofractures in the rock is interpreted by rock models relating velocity changes to damage and crack density. The calculated density of the newly formed cracks reaches higher values for the sandstone than for the granite. Using the estimated crack densities, the attenuation behaviour is interpreted in terms of different attenuation mechanisms; that is, friction and scattering. Rayleigh scattering as described by the model of Hudson (1981) may explain the attenuation qualitatively if the largest plausible crack dimensions are assumed in modelling.

Original languageEnglish
Pages (from-to)395-409
Number of pages15
JournalGeophysical Journal International
Volume139
Issue number2
DOIs
Publication statusPublished - 1999

Keywords

  • Attenuation
  • Cracked media
  • Fractures
  • Seismic velocities
  • Ultrasonic measurements

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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