An empirical Green's function study of a microearthquake swarm in the deeper part of Kakkonda geothermal reservoir, Japan

  • Sugihara M
  • Tosha T
  • Nishi Y
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Abstract

Precise analysis of a microearthquake swarm occurring within an intrusive rock formation has provided a clear hypocenter distribution that is characterized by a NNW-SSE trending vertical plane consisting of a series of small reverse and strike-slip faults. An empirical Green's function analysis was applied to the largest event of the swarm. The direction of the rupture plane of the event, which is of strike-slip type, was determined to be perpendicular to the trend of the hypocenter distribution. A combination of small reverse faults with small strike-slip faults could result in a permeable reverse fault structure in the deeper parts of the geothermal reservoir. One particular signal was interpreted to be a reflection at the surface of the neo-granitic rock, where the most important fractures for production in the deeper reservoir exist.

Author-supplied keywords

  • Fracture
  • Geothermal reservoir
  • Green's function
  • Japan
  • Kakkonda
  • Microearthquake

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