Historical tsunamis · April 1241
1241 Kamakura, Sagami Bay tsunami
Japan
The tsunami of April 1241 originated near Kamakura, Sagami Bay (Japan).
Key facts
- Date
- April 1241
- Cause
- Earthquake
- Magnitude
- M7.0
- Maximum documented water height
- —
- Damage
- limited (under US$ 1 million)
- Observation records
- 2
- Countries affected
- 1
It was triggered by a magnitude 7.0 earthquake.
2 observation sites in 1 countries are recorded.
Damage is estimated at limited (under US$ 1 million).
Map of observation sites
2Each 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 | 2 | — | — | — |
Highest documented water heights
2 / 2Individual 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 |
|---|---|---|---|
| Kamakura · Kanagawa | — | 18 km | Japan |
| Yuigahama · Kanagawa | — | 18 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.