Name : URABE,  Taku
            Position : Associate Professor
            Division/Center :  Earthquake Observation Center
            Research Area : Seismology
 
 
 

Research :

My main research interests are seismic observation system and seismic data processing system.
       We have developed since 1988 new generations of seismic telemetry network system, which includes developments of high-dynamic
       range digitizer and standard waveform data format, UNIX-based automatic processing system, real-time transmission of waveform
       data on IP network, and optical-fiber cabled ocean-bottom seismometer system.
       Among others a unique and large scale system is a nationwide seismic telemetry system using a communications satellite.
       The satellite system collects and also distributes (or broadcasts) continuous waveform data of over 600 seismic stations in Japan.
       Finally most seismologist in Japanese universities can utilyze real-time and continuous waveform data from almost all the seismic
       stations by receiving broadcasted data with a small dish.
       The satellite system has changed the style of seismic observation and data circulation.
 

Publications:

    1.Kodaira, S., T.Iwasaki, T.Urabe, T.Kanazawa, F.Egloff, J.Makris, and H.Shimamura, Crustal structure across the middle Ryukyu
       trench obtained from ocean bottom seismographic data, Tectonophysics, 263, 39--60, 1996.
    2.Hirata, N., S.Ohmi, S.Sakai, K.Katsumata, S.Matsumoto, T.Takanami, A.Yamamoto, T.Nishimura, T.Iidaka, T.Urabe, M.Sekine,
       T.Ooida, F.Yamazaki, H.Katao, Y.Umeda, M.Nakamura, N.Seto, T.Matsushima, H.Shimizu, and Japanese University Group of Urgent
       joint observation of aftershocks of the 1995 Hyogo-ken Nanbu earthquake, J. Phys. Earth, 44, 317--328, 1996.
    3.Wyss, M., K.Shimazaki, and T.Urabe, Quantitative mapping of a precursory seismic quiescence to the Izu-Oshima 1990 (M6.5)
       earthquake, Japan, Geophys. J. Int., 127, 735--743, 1996.
    4.Katsumata, K., T. Urabe, and M. Mizoue, Evidence for a seismic attenuation anomaly beneath the Hida Mountain Range, Central
       Honshu, Japan, Geophys. J. Int., 120, 237--246, 1995.