M 7.9 earthquake – 93 km NW of Attu Station, Alaska
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Local time: Dec 17, 1929 · 21:58 (UTC+11)
MajorShallow · 20 km
Reviewed by a seismologist
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- Magnitude
- 7.9moment magnitude (mw)
- Depth
- 20 kmShallow earthquake
- Epicenter
- 53.439, 172.202904 km from Petropavlovsk-Kamchatsky
- Energy released
- 11 megatons of TNTabout 712 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- —not estimated
- Aftershocks
- 1M2.5+ within 250 km, up to 60 days
- Significance
- 950USGS 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?
Major earthquake. It released 11 megatons of TNT, 22,387 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 250 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around United States.
- 7.7 Komandorskiye Ostrova, Russia region Jul 17, 2017
- 7.6 36 km NE of Attu Station, Alaska Feb 2, 1975
- 7.4 151 km S of Attu Station, Alaska Sep 2, 1907
- 7.1 231 km WNW of Attu Station, Alaska Nov 6, 1990
- 7.1 24 km E of Attu Station, Alaska Apr 16, 1940
- 7.0 80 km SSE of Attu Station, Alaska Apr 16, 1940
- 7.0 167 km WSW of Attu Station, Alaska Apr 10, 1909
- 7.0 171 km WNW of Attu Station, Alaska Jan 5, 1953