TSUNAMI-GENERATION WARNING SYSTEM USING EARTHQUAKE EARLY WARNING

Abstract

We propose early-warning system for reducing tsunami refuge using the data of the magnitude
and the depth informed by the Earthquake Early Warning (EEW) by Japan Metrological Agency (JMA). The
EEW provides advance announcement of the estimated seismic intensity and expectSed arrival time at the just
points and regions before arriving strong motion. The hypocenter and magnitude of the earthquake are estimated
by using wave form data observed by seismographs near the epicenter. Inukai et al. (2009) proposed the method
to determine whether generate tsunami using scaling relation between magnitude and depth of hypocenter. The
probability of tsunami generating is calculated by using the EEW information (magnitude and depth) and the
Inukai’s scaling relations. In this method, the information of probability of tsunami generating is issued in a few
seconds after EEW. We incorporated this method into our system and verified validity of our system.