Historical tsunamis · Jul 22, 1768
1768 Ryukyu Islands tsunami
Japan
The tsunami of Jul 22, 1768 originated near Ryukyu Islands (Japan).
Key facts
- Date
- Jul 22, 1768
- Cause
- Earthquake
- Magnitude
- M6.5
- Maximum documented water height
- 1.20 m
- Houses destroyed
- 9
- Damage
- limited (under US$ 1 million)
- Observation records
- 1
- Countries affected
- 1
It was triggered by a magnitude 6.5 earthquake.
The highest documented water height was 1.20 m (Zamami, Kerama Islands, Japan).
1 observation sites in 1 countries are recorded.
Houses destroyed: 9.
Damage is estimated at limited (under US$ 1 million).
Map of observation sites
1Each 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 | 1 | 1.20 m Zamami, Kerama Islands | — | — |
Highest documented water heights
1 / 1Individual 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 |
|---|---|---|---|
| Zamami, Kerama Islands · Okinawa | 1.20 m | 20 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.