M 6.6 earthquake – 83 km SE of Akutan, Alaska
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Local time: Oct 29, 1946 · 21:47 (UTC-10)
StrongShallow · 30 km
Reviewed by a seismologist
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- Magnitude
- 6.6moment magnitude (mw)
- Depth
- 30 kmShallow earthquake
- Epicenter
- 53.714, -164.7141,213 km from Anchorage
- Energy released
- 120 kilotons of TNTabout 8 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- —not estimated
- Aftershocks
- 0M2.5+ within 43 km
- Significance
- 660USGS score, 0–1,000+
Not rare around here
An earthquake at least as strong struck within 300 km on Apr 1, 1946.
How strong was it?
Strong earthquake. It released 120 kilotons of TNT, 251 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
The strongest earthquakes within 300 km
Since 1900, around United States.
- 8.6 The 1946 Unimak Island, Alaska Earthquake Apr 1, 1946
- 7.8 81 km E of Nikolski, Alaska Jul 2, 1965
- 7.3 2025 Sand Point, Alaska Earthquake Jul 16, 2025
- 7.2 2023 Sand Point, Alaska Earthquake Jul 16, 2023
- 7.1 90 km SE of King Cove, Alaska May 14, 1948
- 7.1 39 km S of Akutan, Alaska Mar 22, 1957
- 7.0 71 km SE of King Cove, Alaska May 30, 1991
- 7.0 Fox Islands, Aleutian Islands, Alaska Jan 1, 1902