QuakeIndex

Earthquake · reviewed by a seismologist

M 4.7mwr

246 km WSW of Tofino, Canada

· 10 km deep · released about 170 tons 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 4.7 (mwr)
Depth
10 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 746 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 170 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 1,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 45× the energy of this one
  3. Magna, Utah 2020 M 5.7 32× the energy of this one
  4. This earthquake M 4.7 about 170 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 350× 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 48.6741, -129.1852. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 4.0 272 km SW of Port McNeill, Canada
  2. 4.1 241 km W of Tofino, Canada
  3. 4.2 266 km SW of Port McNeill, Canada
  4. 3.0 207 km W of Tofino, Canada
  5. 4.1 218 km WSW of Tofino, Canada
  6. 4.4 213 km W of Tofino, Canada
  7. 4.8 212 km W of Tofino, Canada
  8. 4.7 208 km WSW of Tofino, Canada
  9. 4.2 211 km W of Tofino, Canada
  10. 4.5 210 km WSW of Tofino, Canada
  11. 6.4 209 km WSW of Tofino, Canada
  12. 4.4 224 km WSW of Tofino, Canada
  13. 5.2 231 km WSW of Tofino, Canada
  14. 4.2 243 km WSW of Tofino, Canada
  15. 5.3 239 km WSW of Tofino, 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 5.4 on 2018-12-09 — it released about 11 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.