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As part of the Tomakomai CCS demonstration project, JCCS, commissioned from METI, deployed the real-time seismic observation network and seismic monitoring has been ongoing since February, 2015. Our seismic observation network is composed of deep downhole seismometers at three observation wells, an ocean bottom cable (OBC), four ocean bottom seismometers (OBS), and an onshore seismometer. Noise level estimations show that, in the vicinity of the injection points, seismic events greater than M-0.5 are detectable with our seismic observation network. But unfortunately, because of relatively high noise level of recorded seismogram, automatic detection of seismic events currently does not work successfully. Since adjustment and verification of picked seismic events are necessary to appropriate hypocenter location, our seismic monitoring procedures during injection phase have to include following steps, 1:Conduct screening of the waveform data containing amplitude anomalies detected automatically by STA/LTA method, and pick up seismic events, 2:Adjust P/S onset time manually and calculate event locations, 3:Weekly in-house reporting and internal verification, 4:Monthly content update for public disclosure.