Historical tsunamis · September 1257
1257 Off Sanriku tsunami
Japan
The tsunami of September 1257 originated near Off Sanriku (Japan).
Key facts
- Date
- September 1257
- Cause
- Earthquake
- Magnitude
- M7.5
- Maximum documented water height
- —
- Observation records
- 1
- Countries affected
- 1
It was triggered by a magnitude 7.5 earthquake.
1 observation sites in 1 countries are recorded.
Map of observation sites
1Each dot is a documented observation site; colour and size show the observed water height. The triangle marks the source.
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| Japan | 1 | — | — | — |
Highest documented water heights
1 / 1Individual documented observations for this event. Heights come from different measurement types and sources; not every location has a measured height.
| Location / station | Observed height | Distance from source | Country |
|---|---|---|---|
| Sanriku Coast · Iwate | — | 199 km | Japan |
More tsunamis
Source: NOAA National Centers for Environmental Information (NCEI), Global Historical Tsunami Database. Confirmed events only. Deaths and damage are database estimates; older records are incomplete. Water heights come from different types of observation.