M 6.8 earthquake – 212 km SW of Port McNeill, Canada
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Local time: Dec 17, 1980 · 08:21 (UTC-8)
StrongShallow · 10 km
Reviewed by a seismologist
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- Magnitude
- 6.8surface-wave magnitude (ms)
- Depth
- 10 kmShallow earthquake
- Epicenter
- 49.479, -129.496312 km from Campbell River
- Energy released
- 239 kilotons of TNTabout 16 × Hiroshima
- Felt reports
- —"Did You Feel It?" responses
- Shaking intensity
- —not estimated
- Aftershocks
- 2M2.5+ within 56 km, up to 60 days
- Significance
- 711USGS score, 0–1,000+
The strongest here since 1970
The last earthquake at least as strong within 300 km struck on Jun 24, 1970.
How strong was it?
Strong earthquake. It released 239 kilotons of TNT, 501 times the energy of a magnitude 5.0. Bars use the magnitude scale: every step is about 32 times more energy.
Aftershocks
2 earthquakes of M2.5+ within 56 km in the 60 days after.
The strongest earthquakes within 300 km
Since 1900, around Canada.
- 7.5 262 km W of Port McNeill, Canada May 26, 1929
- 7.3 288 km S of Prince Rupert, Canada Jun 24, 1970
- 6.9 32 km SW of Vernon, Canada Dec 6, 1918
- 6.8 210 km SW of Port McNeill, Canada Oct 22, 2018
- 6.7 189 km SW of Port McNeill, Canada Nov 2, 2004
- 6.7 213 km W of Port McNeill, Canada Apr 6, 1992
- 6.7 250 km W of Tofino, Canada Dec 20, 1976
- 6.7 235 km W of Port McNeill, Canada Sep 17, 1929