Skip to content

Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first. Full disclaimer

FreeJapan Alert Decoder

Japan alert decoder · 津波警報

Tsunami Warning

Evacuate now from dangerous places · official rules as of 2026-10-17

← Decode another alert · Earthquake Early Warning on a train

Or tap one

Where are you? (optional)
Evacuate now from dangerous places

津波警報

Tsunami Warning

A tsunami of 1-3 m is expected (announced as 3 m, or 高い = high). That is enough to sweep people away and flood low coastal areas.

What to do now

  1. Evacuate immediately from coastal and riverside areas to high ground or an evacuation building.
  2. Stay there until the warning is lifted.

Don't

  • Don't go to the shore to look.
  • Don't return when the first wave passes.

How long: Stay away until it is lifted (解除); waves repeat.

Issued by: JMA. Live status: JMA warnings map (English)JMA earthquake information (English)JMA tsunami information (English)

source 1source 2

Share on X

Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first.

Data as of 2026-10-17 from official JMA, Cabinet Office, Cabinet Secretariat (J-ALERT) and Ministry of the Environment pages, with official names from the JMA multilingual dictionary (2026-03-26). Not affiliated with JMA or any government agency.

Educational guide, not an alert service: no live data. Always follow official instructions from JMA, your municipality, police, fire and staff. In an emergency, protect yourself first. Data as of 2026-10-17 from official JMA, Cabinet Office, Cabinet Secretariat (J-ALERT) and Ministry of the Environment pages, with official names from the JMA multilingual dictionary (2026-03-26). Not affiliated with JMA or any government agency.