World Map › Major Earthquakes Since 1900 › 1946
Historic Earthquake
1946 Aleutian Islands Earthquake
1 April 1946 · Unimak Island · United States of America
On 1 April 1946 at 12:29 UTC, a magnitude 8.6 earthquake struck the United States of America (Unimak Island), at a depth of 15 km. It occurred on the North American Plate, 31 km from its boundary with the Pacific Plate (subduction zone). It killed at least 168 people. It is the 11th most powerful of the earthquakes recorded since 1900.
- Date
- 1 April 1946
- Time
- 12:29 UTC
- Magnitude
- 8.6
- Depth
- 15 km
- Maximum Intensity
- VI (Mercalli)
- Deaths
- 168
- Estimated Damage
- 26 million US dollars
- Tsunami
- See the tsunami (42.0 m wave)
- Plate
- North American Plate
- Country
- United States of America
- Nearest Volcano
- Mount Roundtop (154 km)
Nearby Major Earthquakes
Other major earthquakes recorded within 300 km.
- 2025United States of America · M 7.3
- 20232023 Alaska Peninsula Earthquake · M 7.21 deaths
- 2020October 2020 Alaska Peninsula Earthquake · M 7.6
- 1957Aleutian Islands, Fox Islands · M 7.5
- 1948Alaska Peninsula · M 7.5
Sources: NOAA National Centers for Environmental Information, Global Significant Earthquake Database (doi:10.7289/V5TD9V7K) · Wikidata · Bird (2003), PB2002 · Natural Earth