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A red-bordered panel with a shaking figure.
Also known as: Earthquake early warning Japan, EEW mark Japan
The on-screen and on-device mark of a Japanese earthquake early warning, issued in the seconds between detection and shaking.
Warns that strong shaking is expected within seconds.
Contexts: Public information
Works on the gap between the fast P wave and the damaging S wave, so the warning arrives before the shaking does and the lead time shortens to nothing near the epicentre; the mark is accompanied by a fixed two-tone chime that is as much a part of the warning as the panel.
Contexts: Public information
A bordered panel carrying written characters above a small map, with a marked epicentre and rings spreading from it.