M 7.8 earthquake – 81 km E of Nikolski, Alaska
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Local time: Jul 2, 1965 · 10:58 (UTC-10)
MajorShallow · 39 km
Reviewed by a seismologist
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- Magnitude
- 7.8moment magnitude (mw)
- Depth
- 39 kmShallow earthquake
- Epicenter
- 53.009, -167.6531,401 km from Anchorage
- Energy released
- 7.6 megatons of TNTabout 504 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 6.8max. instrumental (MMI)
- Aftershocks
- 1M2.5+ within 218 km, up to 60 days
- Significance
- 936USGS score, 0–1,000+
The strongest here since 1929
The last earthquake at least as strong within 300 km struck on Mar 7, 1929.
How strong was it?
Major earthquake. It released 7.6 megatons of TNT, 15,849 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
1 earthquakes of M2.5+ within 218 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around United States.
- 7.8 234 km SSW of Nikolski, Alaska Mar 7, 1929
- 7.4 133 km WNW of Nikolski, Alaska Apr 18, 1916
- 7.1 Fox Islands, Aleutian Islands, Alaska Dec 31, 1901
- 7.1 39 km S of Akutan, Alaska Mar 22, 1957
- 7.1 35 km SW of Nikolski, Alaska Mar 11, 1957
- 7.0 Fox Islands, Aleutian Islands, Alaska Jan 1, 1902
- 7.0 203 km SSE of Unalaska, Alaska Aug 22, 1940
- 6.9 80 km SW of Nikolski, Alaska Mar 9, 1957