Elastic Waves Radiating from a Penny-shaped Reservoir Crack

Shin Ito, Kazuo Hayashi, Hiroyuki Saito

Research output: Contribution to journalConference articlepeer-review

3 Citations (Scopus)


The radiation pattern of a reservoir crack with fluid leakage along the crack periphery is studied by using a penny-shaped fluid-filled crack in an elastic medium, i.e. a rock mass, where we take account of the effect of interfacial stiffness due to contact between the asperities on the upper and lower surfaces of the crack. It is revealed that radiation pattern is classified into three groups depending on parameters, such as aperture, interfacial stiffness and so on. The first group is the radiation pattern governed by input load applied. The second group is the radiation pattern governed by coupling between the rock and fluid motion. The third group is the radiation pattern in between the first and second groups. In the case of the second group, the radiation pattern of elastic waves depends primarily on the interfacial stiffness. The ratio of the crack radius to the initial aperture of the crack has weaker effect on radiation pattern for larger interfacial stiffness. Fluid leakage along the crack periphery has effect on radiation pattern.

Original languageEnglish
Pages (from-to)303-308
Number of pages6
JournalTransactions - Geothermal Resources Council
Publication statusPublished - 2002 Dec 1
EventGeothermal Resources Council: 2002 Annual Meeting - Reno, NV, United States
Duration: 2002 Sep 222002 Sep 25


  • Elastic wave
  • Geothermal reservoir crack
  • Hot dry rock
  • Radiation pattern

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Energy Engineering and Power Technology
  • Geophysics


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