QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2mb

227 km WSW of Tofino, Canada

· 10 km deep · released about 30 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 4.2 (mb)
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 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 5,600× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 250× the energy of this one
  3. Magna, Utah 2020 M 5.7 180× the energy of this one
  4. This earthquake M 4.2 about 30 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 63× 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 48.4637, -128.8203. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.0 253 km WSW of Tofino, Canada
  2. 3.0 207 km W of Tofino, Canada
  3. 4.1 218 km WSW of Tofino, Canada
  4. 4.4 213 km W of Tofino, Canada
  5. 4.8 212 km W of Tofino, Canada
  6. 4.7 208 km WSW of Tofino, Canada
  7. 4.5 210 km WSW of Tofino, Canada
  8. 6.4 209 km WSW of Tofino, Canada
  9. 4.4 224 km WSW of Tofino, Canada
  10. 5.2 231 km WSW of Tofino, Canada
  11. 4.2 243 km WSW of Tofino, Canada
  12. 5.3 239 km WSW of Tofino, Canada
  13. 4.0 217 km WSW of Tofino, Canada
  14. 4.3 207 km W of Tofino, Canada
  15. 4.4 225 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 5.0 on 2024-05-03 — it released about 16 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.