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Evaluation of the real-time earthquake information system in Japan Hiromitsu Nakamura,1
 

Summary: Evaluation of the real-time earthquake information system in Japan
Hiromitsu Nakamura,1
Shigeki Horiuchi,1
Changjiang Wu,1
Shunroku Yamamoto,2
and Paul A. Rydelek3
Received 26 October 2008; revised 21 November 2008; accepted 3 December 2008; published 27 January 2009.
[1] 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

  

Source: Allen, Richard M. - Seismological Laboratory, Department of Earth and Planetary Science, University of California at Berkeley

 

Collections: Geosciences