M 7.2 earthquake – The 1992 Petrolia, California Earthquake
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Local time: Apr 25, 1992 · 11:06 (UTC-7)
MajorShallow · 9.9 km
Reviewed by a seismologist
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- Magnitude
- 7.2moment magnitude (mw)
- Depth
- 9.9 kmShallow earthquake
- Epicenter
- 40.335, -124.22952 km from Eureka
- Energy released
- 951 kilotons of TNTabout 63 × Hiroshima
- Felt reports
- 118"Did You Feel It?" responses
- Shaking intensity
- 8.1max. instrumental (MMI)
- Aftershocks
- 8M2.5+ within 96 km, up to 60 days
- Significance
- 904USGS score, 0–1,000+
The strongest here since 1980
The last earthquake at least as strong within 300 km struck on Nov 8, 1980.
How strong was it?
Major earthquake. It released 951 kilotons of TNT, 1,995 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
8 earthquakes of M2.5+ within 96 km in the 60 days after.
- 4.5 19 km SW of Ferndale, California Apr 25, 1992
- 4.6 34 km SSW of Ferndale, California Apr 25, 1992
- 4.7 39 km SW of Ferndale, California Apr 25, 1992
- 4.6 39 km SW of Ferndale, California Apr 25, 1992
- 6.4 30 km WSW of Ferndale, California Apr 26, 1992
- 6.6 32 km SW of Ferndale, California Apr 26, 1992
- 4.6 43 km SW of Ferndale, California Apr 27, 1992
- 4.9 31 km SSW of Ferndale, California Jun 5, 1992
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 1980 Eureka, California Earthquake Nov 8, 1980
- 7.1 The 1923 Humboldt County, California Earthquake Jan 22, 1923
- 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