Tooru Ooida

Real-Time Data Exchange between University Networks for Microearthquake Observation in Japan

Real-time exchange of waveform data from neighboring seismograph networks is significantly advancing seismic monitoring in central Japan. Five observation centers are connected by leased circuits from NTT (Nippon Telegraph and Telephone Corporation), to exchange three to nine channels of seismic signals on a routine basis. Detection capability and accuracy of seismic parameters for events near network boundaries are considerably improved with this system. It can fill the observation gaps between networks, as verified at the Izu Peninsula and the Hida region, central Japan. Monitoring of seismic activity in the Izu Peninsula, for example, is greatly improved. By connecting local networks in this way, a regional observation system for microearthquakes has been established in central Japan.