Table 1. JMA’s tsunami warning/advisory categories.
From: Outline of the 2011 off the Pacific coast of Tohoku Earthquake (Mw 9.0)
Category | Explanation | Forecast tsunami height | |
|---|---|---|---|
Tsunami warning | Major tsunami | Tsunami height is expected to be 3 meters or more. | Forecast heights are specified for every region using values of 3 m, 4 m, 6 m, 8 m and 10 m or more. |
| Â | Tsunami | Tsunami height is expected to be up to 2 meters. | Same as above, using values of 1 m or 2 m. |
Tsunami advisory | Tsunami height is expected to be about 0.5 meters. | 0.5 m | |