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Basic Operations
memo
• Reception of Early warning mail is
notified by a special warning tone. The
warning tone cannot be changed.
• Earthquake early warning is sent to
areas where strong quakes (over
4 degrees) are expected when an
earthquake with an anticipated maximum
seismic intensity 5 lower occurs.
• Immediately after an earthquake occurs,
quakes (P waves and initial tremors)
near the epicenter are detected and
position, scale, and expected strength are
automatically calculated and notification
is sent as soon as possible within a
few seconds to tens of seconds before
the strong quakes (S waves and major
tremors) caused by the earthquake start.
• Earthquake early warning may not arrive
before the strong tremors in areas near
the epicenter.
• Tsunami warning is a notification
delivered from the Meteorological Agency
(major tidal wave, seismic sea wave) to
the area including the target coast.
• Disaster/evacuation information is
a service that distributes bulletins
concerning residents' safety including
evacuation advisories, evacuation
orders and other warnings issued by the
national and local governments.
• The service is available only in Japan (it
cannot be used overseas).
• No information fee or communication
charge is required for receiving Early
warning mail.