Technology & safety · ENGLISH EDITION
When Japan’s phones ring before the ground moves: a traveller’s guide to earthquake alerts
You are standing on a railway platform when dozens of phones make the same sharp sound and the words 緊急地震速報 appear. There is no time to translate every character, but there is no reason to panic. The alert is not forecasting a future earthquake: the earthquake has already begun, and instruments are trying to give places farther from the source a few useful seconds before stronger motion arrives. One rehearsed plan turns those seconds from noise into action.
The sound is not a prediction
JMA explains that sensors close to the source analyse the first waves, then estimate the focus, magnitude, expected local intensity and arrival of the principal motion. Think of the message as “shaking has started travelling,” not “an earthquake may happen tomorrow.” Those seconds can trigger trains to slow, put lifts into safer operation and let people cover their heads.
The agency is equally direct about limitations. Close to the focus, shaking can beat the message. Intensity estimates can change, and simultaneous nearby earthquakes are difficult to separate quickly. Receiving an alert does not prove that your exact room will be damaged; receiving none does not promise still ground. It is a cue to act, not a final damage report.
Read shindo, not only magnitude
Magnitude describes the earthquake at its source. Japan’s 震度, or shindo, describes observed ground motion at a particular place, so the same earthquake can produce different intensities in neighbouring cities. JMA’s scale has ten levels: 0, 1, 2, 3, 4, then 5-lower and 5-upper, 6-lower and 6-upper, and 7.
That distinction makes news easier to use. Two numbers beside the same event answer different questions, and one dramatic clip cannot describe the whole country. Find your location on an official intensity map, then check your railway, municipality and accommodation. The traveller’s question is not just “how big was it?” but “what is happening here, and what are staff asking us to do now?”
Use the warning for one good movement
Indoors, move away from glass, shelves and hanging objects. Get low, cover your head with your arms or bag, and hold on if you have a stable place. Do not sprint outside during shaking or try the lift. In a shop, museum, hotel or station, follow staff directions; they know the exits and the zones where fittings may fall.
Outside, step away from façades, signs and walls toward a safer open area if one is close. On a platform, move back from the edge, protect your head and never climb onto the track. On a train, hold on and let the crew handle doors and equipment. The aim is not to discover the perfect location. It is to reduce the nearest danger in very little time.
When the shaking stops, curiosity can wait
Pause, check for injury and immediate hazards, then listen to staff or hotel management. Trains may stop for inspection even when the platform looks normal, and parts of a building may be closed as a precaution. Do not push through doors or cross barriers in search of a quicker route. Inspection is part of the safety system, not meaningless delay.
Expect aftershocks and temporary disruption to transport or mobile networks. Send one short message rather than making a long call, conserve battery, and keep a screenshot of your hotel address in Japanese. Do not amplify an unverified social post. Compare local instructions with JMA, municipal and operator channels before changing your route.
At the coast, leave the water first
If you are near the sea or a river mouth and feel strong shaking—or weaker shaking that lasts a long time—move immediately to higher ground or a designated tsunami evacuation building. Do not wait for a video or a perfect translation. JMA warns that a tsunami can reach nearby coasts before a warning is issued when the source is close.
Even a Tsunami Advisory means leaving the water and coast. Tsunami Warnings and Major Tsunami Warnings require immediate evacuation from coastal and riverside areas. Waves can arrive repeatedly and exceed local estimates. Stay in the safe place until the official warning is lifted; a quiet shoreline is not an all-clear.
Prepare the phone before the phone prepares you
Japan’s Tourism Agency lists Safety tips among its tools for overseas visitors. Its page updated on 2 April 2026 says the app supports 15 languages and pushes earthquake, tsunami, severe-weather, volcano, evacuation and other notices. Download it before travel, enable the needed notifications and location setting, and test your language. It supports decisions; it does not replace instructions from the place you are standing in.
Carry a charged power bank, a short cable, water, essential medicine, a passport copy and your accommodation address. At check-in, notice the emergency stairs and assembly point. Agree on a meeting place with companions in case the network fails. A small kit that you understand is more useful than a suitcase of emergency gadgets you cannot find.
The ninety-second Japwa drill
Stand in your room and imagine the alert starting now. In ten seconds: where is the glass, and what covers your head? In thirty: where are your shoes and phone? In sixty: which official source will you check, and where will you meet your companion? Repeat the exercise once at the hotel and once on a platform.
Japan’s warning technology is impressive, but the decisive component is not the tone or screen. It is the fast human choice that follows. A handful of seconds cannot cancel an earthquake. They can turn you from a spectator trying to decode an alert into a traveller who knows the first safe movement—and that is precisely what the system is designed to give you.
Japwa field note: when the alert sounds, do not try to understand everything. Understand one thing first—protect your head, steady yourself, then follow official instructions.
Official sources
Official sources
- Japan Meteorological Agency — What is an Earthquake Early Warning?
- Japan Meteorological Agency — Limitations of Earthquake Early Warnings
- Japan Meteorological Agency — Earthquakes and the seismic-intensity scale
- Japan Meteorological Agency — Tsunami warnings and required actions
- Japan Tourism Agency — Safety tips app and disaster tools (updated 2 April 2026)
- JNTO — Japan Safe Travel earthquake information and response actions
- Cabinet Office — Nankai Trough Earthquake Extra Information e-learning
