QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2mwr

Southern Yukon Territory, Canada

· 17 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 (mwr)
Depth
17 km below the surface
Felt
1 report · strongest reported intensity II
Measured shaking
intensity IV (ShakeMap)
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1386 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has reported feeling it to USGS.

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 61.2598, -139.5445. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.8 158 km E of McCarthy, Alaska
  2. 1.7 159 km E of McCarthy, Alaska
  3. 1.5 159 km E of McCarthy, Alaska
  4. 1.7 157 km ESE of McCarthy, Alaska
  5. 2.0 157 km E of McCarthy, Alaska
  6. 1.8 156 km E of McCarthy, Alaska
  7. 2.5 156 km E of McCarthy, Alaska
  8. 1.7 157 km E of McCarthy, Alaska
  9. 1.5 155 km E of McCarthy, Alaska
  10. 1.7 157 km E of McCarthy, Alaska
  11. 1.5 156 km E of McCarthy, Alaska
  12. 4.0 159 km E of McCarthy, Alaska
  13. 1.7 149 km N of Yakutat, Alaska
  14. 2.9 156 km ESE of McCarthy, Alaska
  15. 2.0 Southern Yukon Territory, 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 4.0 on 2017-11-05.

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

On USGS

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