Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009georl..3600b01n&link_type=abstract
Geophysical Research Letters, Volume 36, Issue 2, CiteID L00B01
Other
Seismology: Earthquake Ground Motions And Engineering Seismology, Seismology: Seismic Monitoring And Test-Ban Treaty Verification, Seismology: Seismic Instruments And Networks (0935, 3025)
Scientific paper
The real-time earthquake information system (REIS) of the Japanese seismic network is developed for automatically determining earthquake parameters within a few seconds after the P-waves arrive at the closest stations using both the P-wave arrival times and the timing data that P-waves have not yet arrived at other stations. REIS results play a fundamental role in the real-time information for earthquake early warning in Japan. We show the rapidity and accuracy of REIS from the analysis of 4,050 earthquakes in three years since 2005; 44 percent of the first reports are issued within 5 seconds after the first P-wave arrival and 80 percent of the events have a difference in epicenter distance less than 20 km relative to manually determined locations. We compared the formal catalog to the estimated magnitude from the real-time analysis and found that 94 percent of the events had a magnitude difference of +/-1.0 unit.
Horiuchi Shigeki
Nakamura Hiromitsu
Rydelek Paul A.
Wu Changjiang
Yamamoto Shunroku
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