M 7.1 earthquake – The 1923 Humboldt County, California Earthquake
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Local time: Jan 22, 1923 · 01:04 (UTC-8)
MajorShallow · 15 km
Reviewed by a seismologist
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- Magnitude
- 7.1moment magnitude (mw)
- Depth
- 15 kmShallow earthquake
- Epicenter
- 40.482, -125.03482 km from Eureka
- Energy released
- 674 kilotons of TNTabout 45 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 5.2max. instrumental (MMI)
- Aftershocks
- 1M2.5+ within 84 km, up to 60 days
- Significance
- 780USGS score, 0–1,000+
Not rare around here
An earthquake at least as strong struck within 300 km on Jan 31, 1922.
How strong was it?
Major earthquake. It released 674 kilotons of TNT, 1,413 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 84 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around United States.
- 7.4 123 km W of Big Lagoon, California Jan 31, 1922
- 7.2 153 km W of Big Lagoon, California Jun 15, 2005
- 7.2 The 1992 Petrolia, California Earthquake Apr 25, 1992
- 7.2 The 1980 Eureka, California Earthquake Nov 8, 1980
- 7.1 121 km W of Ferndale, California Sep 1, 1994
- 7.0 2024 Offshore Cape Mendocino, California Earthquake Dec 5, 2024
- 7.0 136 km WSW of Brookings, Oregon Aug 17, 1991
- 6.9 103 km W of Pistol River, Oregon Jul 13, 1991