QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

136 km E of McCarthy, Alaska

· 3.1 km deep · released about 1,300 lb 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 3.1 (ml)
Depth
3.1 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1788 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 61.4620, -140.3653. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.5 141 km WNW of Haines Junction, Canada
  2. 1.5 140 km WNW of Haines Junction, Canada
  3. 1.6 117 km E of McCarthy, Alaska
  4. 2.1 131 km ESE of McCarthy, Alaska
  5. 1.8 152 km WNW of Haines Junction, Canada
  6. 1.8 121 km ESE of McCarthy, Alaska
  7. 2.5 121 km E of McCarthy, Alaska
  8. 1.9 123 km E of McCarthy, Alaska
  9. 1.6 144 km WNW of Haines Junction, Canada
  10. 1.6 122 km E of McCarthy, Alaska
  11. 1.5 136 km E of McCarthy, Alaska
  12. 1.6 121 km E of McCarthy, Alaska
  13. 1.5 119 km E of McCarthy, Alaska
  14. 1.6 143 km E of McCarthy, Alaska
  15. 2.8 126 km E of McCarthy, Alaska

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 4.9 on 2021-05-09 — it released about 500 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.