Historical tsunamis · Jul 22, 2020, 6:12 AM UTC
2020 Shumagin Islands, Ak tsunami
United States
The tsunami of Jul 22, 2020, 6:12 AM UTC originated near Shumagin Islands, Ak (United States).
Key facts
- Date
- Jul 22, 2020, 6:12 AM UTC
- Cause
- Earthquake
- Magnitude
- M7.8
- Depth
- 28 km
- Maximum documented water height
- 0.24 m
- Damage
- limited (under US$ 1 million)
- Observation records
- 13
- Countries affected
- 2
It was triggered by a magnitude 7.8 earthquake at a depth of 28 km.
The highest documented water height was 0.24 m (Sand Point, Ak, United States).
13 observation sites in 2 countries are recorded.
Damage is estimated at limited (under US$ 1 million).
Map of observation sites
13Each 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) · Jul 22, 2020, 6:12 AM UTC
- 0:45 hUnited States · D46402 Bpr, S of Dutch Harbor, Ak · 0.01 m
1 places with a documented arrival time
Observations by country
| Country | Observation records | Maximum documented water height | Deaths | Earliest arrival |
|---|---|---|---|---|
| United States | 9 | 0.24 m Sand Point, Ak | — | 0:45 h |
 Canada | 4 | 0.03 m Tofino (Clayoquot),British Columbia | — | — |
Highest documented water heights
13 / 13Individual 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 |
|---|---|---|---|
| Sand Point, Ak · Ak | 0.24 m | 125 km | United States |
| Unalaska, Dutch Harbor, Ak · Ak | 0.05 m | 531 km | United States |
| Tofino (Clayoquot),British Columbia · Bc | 0.03 m | 2,310 km | Canada |
| Ucluelet, British Columbia · Bc | 0.03 m | 2,344 km | Canada |
| Bamfield, British Columbia · Bc | 0.02 m | 2,376 km | Canada |
| Henslung Cove, British Columbia · Bc | 0.02 m | 1,646 km | Canada |
| D46402 Bpr, S of Dutch Harbor, Ak · Ak | 0.01 m | 575 km | United States |
| D46414 Bpr, SE of Chirikof Is, Ak · Ak | 0.01 m | 424 km | United States |
| D21414 Bpr, Northwest Pacific Ocean · Ak | 0.00 m | 1,718 km | United States |
| D46408 Bpr, Northwest Pacific Ocean · Ak | 0.00 m | 976 km | United States |
| D46409 Bpr, SE of Kodiak, Ak · Ak | 0.00 m | 643 km | United States |
| D46413 Bpr, East of Adak, Ak · Ak | 0.00 m | 1,353 km | United States |
| D46415 Bpr, SW of Juneau, Ak · Ak | 0.00 m | 1,240 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.