Historical tsunamis · Jun 21, 1983, 6:25 AM UTC
1983 N. Honshu Island tsunami
Japan
The tsunami of Jun 21, 1983, 6:25 AM UTC originated near N. Honshu Island (Japan).
Key facts
- Date
- Jun 21, 1983, 6:25 AM UTC
- Cause
- Earthquake
- Magnitude
- M6.9
- Depth
- 10 km
- Maximum documented water height
- 1.00 m
- Damage
- limited (under US$ 1 million)
- Observation records
- 27
- Countries affected
- 1
It was triggered by a magnitude 6.9 earthquake at a depth of 10 km.
The highest documented water height was 1.00 m.
27 observation sites in 1 countries are recorded.
Damage is estimated at limited (under US$ 1 million).
Map of observation sites
27Each 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 | 27 | 0.42 m Yoshioka | — | — |
Highest documented water heights
15 / 27Individual 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 |
|---|---|---|---|
| Yoshioka · Hokkaido | 0.42 m | 97 km | Japan |
| Iwanaiko · Hokkaido | 0.33 m | 216 km | Japan |
| Esashi · Hokkaido | 0.30 m | 104 km | Japan |
| Noshiroko · Akita | 0.21 m | 147 km | Japan |
| Senposhigyoko · Hokkaido | 0.21 m | 448 km | Japan |
| Oshoro · Hokkaido | 0.16 m | 252 km | Japan |
| Ryotsuko · Niigata | 0.16 m | 367 km | Japan |
| Ishikariwanshinko · Hokkaido | 0.15 m | 277 km | Japan |
| Naoetsuko · Niigata | 0.15 m | 468 km | Japan |
| Iwafuneko · Niigata | 0.13 m | 352 km | Japan |
| Kashiwazakiko · Niigata | 0.13 m | 444 km | Japan |
| Kutsugatako · Hokkaido | 0.13 m | 458 km | Japan |
| Fukaura · Aomori | 0.11 m | 104 km | Japan |
| Sakata · Yamagata | 0.11 m | 277 km | Japan |
| Oga · Akita | 0.10 m | 165 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.