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| Messages about tsunami | Indication |
|---|---|
| Tsunami Warning / Advisory | When the earthquake with the possibility that the tsunami is generated occurs, JMA provide the tsunami warning or tsunami advisory according to expected tsunami height. Tsunami warning (Major tsunami, tsunami) or tsunami advisory is provided within about three minutes after the occurrence of earthquake. |
| Tsunami information (forecast of height and arrival time of initial wave) |
Forecast of height and arrival times of initial wave are provided for each forecast region. |
| Tsunami Information (arrival time of tsunami and high tide) |
Information on high tide and forecast arrival time of tsunami at several points are provided. |
| Tsunami Information (tsunami observations) |
Arrival time and observed tsunami height at tsunami observation stations are provided. |
| Category | Indication | Forecast tsunami height | |
|---|---|---|---|
| Tsunami Warning | Major tsunami | Tsunami height is expected to be 3 meters or more. | Forecast heights are specifically indicated for every region; namely 3m, 4m, 6m, 8m and 10m or more. |
| Tsunami | Tsunami height is expected to be up to 2 meters. | Same as above, but 1m or 2m. | |
| Tsunami Advisory | Tsunami height is expected to be about 0.5 meters. | 0.5m | |