QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

108 km WNW of Arctic Village, Alaska

· 18 km deep · released about 1.3 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 3.3 (ml)
Depth
18 km below the surface
Felt
no reports yet
Measured shaking
intensity III (ShakeMap)
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2398 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 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× 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 68.5569, -147.9050. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.6 131 km WNW of Arctic Village, Alaska
  2. 1.9 111 km WNW of Arctic Village, Alaska
  3. 1.5 117 km WNW of Arctic Village, Alaska
  4. 1.8 northern Alaska
  5. 1.9 northern Alaska
  6. 1.6 123 km NW of Arctic Village, Alaska
  7. 1.8 128 km WNW of Arctic Village, Alaska
  8. 1.5 100 km NW of Arctic Village, Alaska
  9. 1.5 125 km WNW of Arctic Village, Alaska
  10. 1.5 northern Alaska
  11. 1.7 123 km NW of Arctic Village, Alaska
  12. 1.5 118 km NW of Arctic Village, Alaska
  13. 1.5 105 km WNW of Arctic Village, Alaska
  14. 1.5 122 km NW of Arctic Village, Alaska
  15. 1.8 120 km WNW of Arctic Village, 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.

On USGS

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