QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

84 km N of Arctic Village, Alaska

· 9.5 km deep · released about 43 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 2.1 (ml)
Depth
9.5 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1097 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 lb of TNT

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 68.8756, -145.2629. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.8 106 km SSW of Kaktovik, Alaska
  2. 1.6 105 km SSW of Kaktovik, Alaska
  3. 1.6 104 km SSW of Kaktovik, Alaska
  4. 1.9 104 km SSW of Kaktovik, Alaska
  5. 2.8 104 km SSW of Kaktovik, Alaska
  6. 2.0 108 km SSW of Kaktovik, Alaska
  7. 2.1 107 km SSW of Kaktovik, Alaska
  8. 1.5 106 km SSW of Kaktovik, Alaska
  9. 1.7 106 km SSW of Kaktovik, Alaska
  10. 2.9 105 km SSW of Kaktovik, Alaska
  11. 1.7 107 km SSW of Kaktovik, Alaska
  12. 2.5 76 km N of Arctic Village, Alaska
  13. 2.1 75 km N of Arctic Village, Alaska
  14. 2.0 74 km N of Arctic Village, Alaska
  15. 1.9 73 km N 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.