M 6.6 earthquake – The 1934 Hansel Valley, Utah Earthquake
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Local time: Mar 12, 1934 · 08:05 (UTC-7)
StrongShallow · 8.5 km
Reviewed by a seismologist
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- Magnitude
- 6.6moment magnitude (mw)
- Depth
- 8.5 kmShallow earthquake
- Epicenter
- 41.658, -112.79567 km from Brigham City
- Energy released
- 120 kilotons of TNTabout 8 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- 7.7max. instrumental (MMI)
- Aftershocks
- 7M2.5+ within 43 km, up to 60 days
- Significance
- 670USGS 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?
Strong earthquake. It released 120 kilotons of TNT, 251 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
7 earthquakes of M2.5+ within 43 km in the 60 days after.
- 4.8 27 km SW of Thatcher, Utah Mar 12, 1934
- 5.1 27 km SW of Thatcher, Utah Mar 12, 1934
- 5.9 35 km SSW of Howell, Utah Mar 12, 1934
- 5.1 27 km SW of Thatcher, Utah Mar 15, 1934
- 4.8 27 km SW of Thatcher, Utah Mar 15, 1934
- 5.3 27 km SW of Thatcher, Utah Apr 14, 1934
- 5.5 56 km SW of Howell, Utah May 6, 1934
The strongest earthquakes within 300 km
Since 1900, around United States.
- 6.9 The 1983 Borah Peak Earthquake, Idaho Oct 28, 1983
- 6.1 17 km NE of Snowville, Utah Mar 28, 1975
- 5.9 8 km ENE of Wells, Nevada Feb 21, 2008
- 5.9 35 km SSW of Howell, Utah Mar 12, 1934
- 5.8 8 km W of Garden City, Utah Aug 30, 1962
- 5.8 4 km SSE of Auburn, Wyoming Feb 3, 1994
- 5.7 5 km NNE of Magna, Utah Mar 18, 2020
- 5.6 Hansel Valley, Utah Oct 6, 1909