Historical tsunamis · Nov 4, 1947, 12:09 AM UTC
1947 W. Hokkaido Island tsunami
Japan
The tsunami of Nov 4, 1947, 12:09 AM UTC originated near W. Hokkaido Island (Japan).
Key facts
- Date
- Nov 4, 1947, 12:09 AM UTC
- Cause
- Earthquake
- Magnitude
- M7.0
- Depth
- 33 km
- Maximum documented water height
- 2.00 m
- Damage
- limited (under US$ 1 million)
- Observation records
- 4
- Countries affected
- 1
It was triggered by a magnitude 7.0 earthquake at a depth of 33 km.
The highest documented water height was 2.00 m (Kutsugata, Japan).
4 observation sites in 1 countries are recorded.
Damage is estimated at limited (under US$ 1 million).
Map of observation sites
4Each 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 | 4 | 2.00 m Kutsugata | — | — |
Highest documented water heights
4 / 4Individual 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 |
|---|---|---|---|
| Kutsugata · Hokkaido | 2.00 m | 154 km | Japan |
| Wakkanai · Hokkaido | 2.00 m | 188 km | Japan |
| Haboroko · Hokkaido | 0.70 m | 84 km | Japan |
| Otaru · Hokkaido | 0.60 m | 54 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.