Historical tsunamis · Jun 24, 2011, 3:09 AM UTC
2011 Atka, Aleutian Islands, Ak tsunami
United States
The tsunami of Jun 24, 2011, 3:09 AM UTC originated near Atka, Aleutian Islands, Ak (United States).
Key facts
- Date
- Jun 24, 2011, 3:09 AM UTC
- Cause
- Earthquake
- Magnitude
- M7.3
- Depth
- 52 km
- Maximum documented water height
- 0.10 m
- Observation records
- 7
- Countries affected
- 2
It was triggered by a magnitude 7.3 earthquake at a depth of 52 km.
The highest documented water height was 0.10 m (Nikolski, Ak, United States).
7 observation sites in 2 countries are recorded.
Outside the source country, the earliest documented arrival was at Midway Islands (USA Territory) after 3:27 h.
Map of observation sites
7Each dot is a documented observation site; colour and size show the observed water height. The triangle marks the source.
Tsunami arrival times
Documented arrival times from the NOAA/NCEI database, showing the earliest recorded location per country. Coverage is incomplete: a country without an entry was not necessarily spared.
- 0:00 hEarthquake (origin) · Jun 24, 2011, 3:09 AM UTC
- 1:02 hUnited States · Adak, Sweeper Cove, Ak · 0.06 m
- 3:27 hUSA Territory · Midway Islands · 0.04 m
7 places with a documented arrival time
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| United States | 6 | 0.10 m Nikolski, Ak | — | 1:02 h |
| USA Territory | 1 | 0.04 m Midway Islands | — | 3:27 h |
Highest documented water heights
7 / 7Individual 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 |
|---|---|---|---|
| Nikolski, Ak · Ak | 0.10 m | 224 km | United States |
| Saint Paul Island, Ak · Ak | 0.09 m | 574 km | United States |
| Adak, Sweeper Cove, Ak · Ak | 0.06 m | 330 km | United States |
| Hilo, Hawaii, Hi · Hi | 0.06 m | 3,872 km | United States |
| Akutan, Ak · Ak | 0.04 m | 467 km | United States |
| Midway Islands · Hi | 0.04 m | 2,686 km | USA Territory |
| Nawiliwili, Kauai, Hi · Hi | 0.04 m | 3,509 km | United States |
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.