Historical tsunamis · Jul 31, 1640
1640 SE. Hokkaido Island tsunami
Japan
The tsunami of Jul 31, 1640 originated near SE. Hokkaido Island (Japan).
Key facts
- Date
- Jul 31, 1640
- Cause
- Volcano and landslide
- Magnitude
- M6.5
- Maximum documented water height
- 8.00 m
- Deaths
- 700
- Houses destroyed
- 20
- Damage
- limited (under US$ 1 million)
- Observation records
- 3
- Countries affected
- 1
Cause according to NOAA/NCEI: Volcano and landslide.
The highest documented water height was 8.00 m.
3 observation sites in 1 countries are recorded.
The database records 700 deaths.
Houses destroyed: 20.
Damage is estimated at limited (under US$ 1 million).
Map of observation sites
3Each 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 | 3 | — | 700 | — |
Highest documented water heights
3 / 3Individual 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 |
|---|---|---|---|
| Hidaka · Hokkaido | — | 171 km | Japan |
| Tokachi · Hokkaido | — | 219 km | Japan |
| Uchiura Bay · Shizuoka | — | 7 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.