M 7.9 earthquake – 261 km SE of Chiniak, Alaska
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Local time: Jan 23, 2018 · 00:31 (UTC-9)
MajorShallow · 14 kmPAGER greenTsunami information issued
Reviewed by a seismologist
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- Magnitude
- 7.9moment magnitude (mww)
- Depth
- 14 kmShallow earthquake
- Epicenter
- 56.004, -149.166582 km from Anchorage
- Energy released
- 11 megatons of TNTabout 712 × Hiroshima
- Felt reports
- 2,383"Did You Feel It?" responses
- Shaking intensity
- 4.3max. instrumental (MMI)
- Aftershocks
- 500M2.5+ within 250 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?
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
500 earthquakes of M2.5+ within 250 km in the 60 days after.
- 3.9 221 km SE of Chiniak, Alaska Jan 23, 2018
- 5.0 246 km SE of Chiniak, Alaska Jan 23, 2018
- 4.4 239 km SE of Chiniak, Alaska Jan 23, 2018
- 4.4 269 km ESE of Chiniak, Alaska Jan 23, 2018
- 4.3 253 km SE of Chiniak, Alaska Jan 23, 2018
- 4.8 245 km SE of Chiniak, Alaska Jan 23, 2018
- 4.1 283 km ESE of Chiniak, Alaska Jan 23, 2018
- 4.7 225 km SE of Chiniak, Alaska Jan 23, 2018
- 4.5 256 km SE of Chiniak, Alaska Jan 23, 2018
- 4.3 249 km SE of Chiniak, Alaska Jan 23, 2018
The strongest earthquakes within 300 km
Since 1900, around United States.
- 7.9 Kodiak Island region, Alaska Oct 9, 1900
- 7.0 153 km SE of Halibut Cove, Alaska Dec 23, 1906
- 6.9 47 km S of Old Harbor, Alaska Jan 10, 2001
- 6.8 100 km SSE of Old Harbor, Alaska Jun 19, 1986
- 6.7 120 km S of Akhiok, Alaska Apr 10, 1957
- 6.6 124 km SSE of Halibut Cove, Alaska Apr 23, 1968
- 6.6 88 km SSE of Old Harbor, Alaska Dec 21, 1917
- 6.6 94 km SSE of Old Harbor, Alaska Apr 12, 1978
In the week before
Earthquakes within 250 km in the 7 days before this one: possible foreshocks.