M 9.2 earthquake – The 1964 Prince William Sound, Alaska Earthquake
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Local time: Mar 27, 1964 · 17:36 (UTC-10)
GreatShallow · 25 km
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- Magnitude
- 9.2moment magnitude (mw)
- Depth
- 25 kmShallow earthquake
- Epicenter
- 60.908, -147.339128 km from Eagle River
- Energy released
- 951 megatons of TNTabout 63,433 × Hiroshima
- Felt reports
- 459"Did You Feel It?" responses
- Shaking intensity
- 8.4max. instrumental (MMI)
- Aftershocks
- 74M2.5+ within 500 km, up to 60 days
- Significance
- 1,720USGS score, 0–1,000+
The strongest within 300 km on record
No earthquake this strong has been recorded this close since our catalog begins in 1900.
How strong was it?
Great earthquake. It released 951 megatons of TNT, 1,995,262 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
74 earthquakes of M2.5+ within 500 km in the 60 days after.
- 6.3 37 km SSE of Lowell Point, Alaska Mar 28, 1964
- 5.7 65 km SSW of Cordova, Alaska Mar 28, 1964
- 5.7 121 km S of Lowell Point, Alaska Mar 28, 1964
- 5.8 33 km ESE of Bear Creek, Alaska Mar 28, 1964
- 5.7 Southern Alaska Mar 28, 1964
- 5.7 23 km SSE of Chenega, Alaska Mar 28, 1964
- 6.5 78 km ENE of Ouzinkie, Alaska Mar 28, 1964
- 5.8 135 km SE of Halibut Cove, Alaska Mar 28, 1964
- 6.4 138 km SE of Halibut Cove, Alaska Mar 28, 1964
- 5.8 55 km SE of Chiniak, Alaska Mar 28, 1964
The strongest earthquakes within 300 km
Since 1900, around United States.
- 7.9 2002 Denali Fault, Alaska Earthquake Nov 3, 2002
- 7.1 1 km SE of Point MacKenzie, Alaska Nov 30, 2018
- 7.0 153 km SE of Halibut Cove, Alaska Dec 23, 1906
- 7.0 52 km NE of Chenega, Alaska Jun 21, 1928
- 6.9 27 km SE of Skwentna, Alaska Nov 3, 1943
- 6.8 Southern Alaska Apr 27, 1933
- 6.8 4 km NE of Beluga, Alaska Oct 23, 1936
- 6.8 31 km SSW of Glacier View, Alaska May 4, 1934