Historical tsunamis · Apr 25, 1843
1843 SE. Hokkaido Island tsunami
Japan
The tsunami of Apr 25, 1843 originated near SE. Hokkaido Island (Japan).
Key facts
- Date
- Apr 25, 1843
- Cause
- Earthquake
- Magnitude
- M8.4
- Maximum documented water height
- 4.50 m
- Deaths
- 45
- Houses destroyed
- 75
- Damage
- moderate (about US$ 1–5 million)
- Observation records
- 8
- Countries affected
- 2
It was triggered by a magnitude 8.4 earthquake.
The highest documented water height was 4.50 m (Akkeshi, Japan).
8 observation sites in 2 countries are recorded.
The database records 45 deaths.
Houses destroyed: 75.
Damage is estimated at moderate (about US$ 1–5 million).
Map of observation sites
8Each 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 | 7 | 4.50 m Akkeshi | 45 | — |
 Russia | 1 | — | — | — |
Highest documented water heights
8 / 8Individual 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 |
|---|---|---|---|
| Akkeshi · Hokkaido | 4.50 m | 149 km | Japan |
| Kushiro · Hokkaido | 4.50 m | 172 km | Japan |
| Shiranuka · Hokkaido | 3.50 m | 190 km | Japan |
| Hachinohe · Aomori | 3.00 m | 408 km | Japan |
| Hanasaki · Hokkaido | 3.00 m | 147 km | Japan |
| Hakodate · Hokkaido | 1.00 m | 438 km | Japan |
| Shinryu · Hokkaido | — | 150 km | Japan |
| Urup Island, Kurilskiye · Kuril Islands | — | 539 km | Russia |
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.