Papers - Nagano Koji

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  1. Estimation of discontinuity orientation with coherence matrix analysis of guided waves

    永野宏治・新妻弘明，The Journal of the Acoustical Society of Japan，vol.52，(6)，(p.420 ～ 428)，1996

  2. Polarization of crackwaves along an artificial subsurface fracture

    K. Nagano・ K. Sato ・ H. Niitsuma，Geophysical Research Letters，vol.23，(16)，(p.2017 ～ 2020)，1996

  3. Estimation of guided wave velocity in subsurface fracture using a time-frequency representation technique

    永野宏治・新妻弘明，Transactions of the Society of Instrument and Control Engineers，vol.32，(6)，(p.802 ～ 810)，1996

  4. Crack stiffness from crack wave velocities

    K. Nagano and H. Niitsuma，Geophysical Research Letters，vol.23，(6)，(p.689 ～ 692)，1996

  5. Crack stiffness from crack wave velocities

    K. Nagano and H. Niitsuma，Geophysical Research Letters，vol.23，(6)，(p.689 ～ 692)，1996

  6. Fractals on AE emanated during hydraulic fracturing

    K. Itakura・ K. Sato・ K. Nagano・ Y. Kusano，Journal of Acoustic Emission，vol.13，(3-4)，(p.S75-S82 ～ )，1995

  7. Guided waves trapped in an artificial subsurface fracture

    K. Nagano・ H. Saito・ H. Niitsuma，Geothermal Science and Technology，vol.5，(1-2)，(p.63 ～ 70)，1995

  8. Characterization of thermal cracking by AE time series analysis

    K. Nagano・ K. Sugawara・ K. Itakura・ K. Sato，Journal of Acoustic Emission，vol.13，(1-2)，(p.S54-S59 ～ )，1995

  9. Precise source location of AE doublets by spectral matrix analysis of triaxial hodogram

    H. Moriya・K. Nagano・H. Niitsuma，Geophysics，vol.59，(1)，(p.36 ～ 45)，1994

  10. Analysis of acoustic emissions from hydraulically induced tensile fracture of rock

    H. Niitsuma・ K. Nagano・ K. Hisamatsu，Journal of Acoustic Emission，vol.11，(1-2)，(p.S1-S18 ～ )，1994

  11. Interval patterns of the AE sequences and subsurface fracture extension in Ogachi HDR geothermal field

    永野宏治・相田真人・佐藤一彦・新妻弘明・海江田秀志，Journal of the Geothermal Research Society of Japan，vol.16，(4)，(p.435 ～ 454)，1994

  12. Downhole AE measurement of hydraulic fracturing in Ogachi HDR model field

    永野宏治・森谷祐一・浅沼　宏・佐藤源之・新妻弘明・海江田秀志，Journal of the Geothermal Research Society of Japan，vol.16，(1)，(p.85 ～ 108)，1994

  13. Automatic algorithm for triaxial hodogram source location in downhole acoustic emission measurement

    K. Nagano・H. Niitsuma・N. Chubachi，Geophysics，vol.54，(4)，(p.508 ～ 513)，1989

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