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Seismological Research Letters Volume 80, Number 5 September/October 2009 717doi: 10.1785/gssrl.80.5.717 INTRODUCTION
 

Summary: Seismological Research Letters Volume 80, Number 5 September/October 2009 717doi: 10.1785/gssrl.80.5.717
INTRODUCTION
e earthquake early warning (EEW) information provided by
the Japan Meteorological Agency (JMA) is designed to enable
public o cials, key safety personnel, and the general public
to take advance countermeasures against the e ects of earth-
quake strong motion. e goal of the early warning system is
earliest -wave arrival time in each subprefectural area (about
a quarter to a third of one prefecture) before the strong motion
arrival. For the system to be e ective, it is essential that JMA
publicize the principle and purpose of the warning messages,
the technical limits of EEW, and the proper actions to be taken
when a warning is received. is is particularly important given
the very short warning times (a few to a few tens of seconds) so
that EEW can be used e ectively without causing unnecessary
confusion. In this article we outline the design of the EEW sys-
tem in Japan and the necessary preparatory process to start pro-
viding EEW information to the general public, summarize the
performance of the system since it was launched nationwide in
DESIGN OF THE EEW SYSTEM

  

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

 

Collections: Geosciences