QuakeIndex

Earthquake · reviewed by a seismologist

M 6.5mww

237 km SW of Port McNeill, Canada

· 10 km deep · released about 85 kilotons of TNT

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Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
Magnitude
M 6.5 (mww)
Depth
10 km below the surface
Felt
26 reports · strongest reported intensity II
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1609 days ago

This was a strong earthquake. Damage is likely near the epicentre and it is felt over a wide area. 26 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 kilotons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 7.5 would have released about 32 times as much.

  1. Ridgecrest, California 2019 M 7.1 7.9× the energy of this one
  2. Loma Prieta, California 1989 M 6.9 4× the energy of this one
  3. Northridge, California 1994 M 6.7 2× the energy of this one
  4. This earthquake M 6.5 about 85 kilotons of TNT
  5. Mineral, Virginia 2011 M 5.8 this one released 11× more
  6. Magna, Utah 2020 M 5.7 this one released 16× more

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

Where

Epicentre 49.2970, -129.7237. Map © OpenStreetMap contributors.

Aftershocks so far

17 earthquakes have been recorded within 50 km since this one.

  1. 4.1 257 km SW of Port McNeill, Canada
  2. 5.6 215 km SW of Port McNeill, Canada
  3. 4.4 195 km SW of Port McNeill, Canada
  4. 4.1 193 km SW of Port McNeill, Canada
  5. 5.6 214 km SW of Port McNeill, Canada
  6. 6.0 237 km SW of Port McNeill, Canada
  7. 4.1 222 km WSW of Port McNeill, Canada
  8. 4.3 224 km SW of Port McNeill, Canada
  9. 4.9 211 km SW of Port McNeill, Canada
  10. 4.0 235 km SW of Port McNeill, Canada
  11. 4.6 224 km SW of Port McNeill, Canada
  12. 4.3 209 km SW of Port McNeill, Canada
  13. 4.2 223 km SW of Port McNeill, Canada
  14. 4.4 218 km SW of Port McNeill, Canada
  15. 4.1 214 km WSW of Port McNeill, Canada

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

For this area

The largest earthquake within 50 km in our catalogue was M 6.8 on 2018-10-22 — it released about 2.8 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.