QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

northern Alaska

· 12 km deep · released about 85 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 2.3 (ml)
Depth
12 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2521 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 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 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 69.0652, -146.9440. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.7 126 km SSE of Prudhoe Bay, Alaska
  2. 1.5 107 km NW of Arctic Village, Alaska
  3. 1.6 104 km NW of Arctic Village, Alaska
  4. 1.6 119 km NNW of Arctic Village, Alaska
  5. 1.7 96 km NW of Arctic Village, Alaska
  6. 1.7 117 km NNW of Arctic Village, Alaska
  7. 2.0 73 km NW of Arctic Village, Alaska
  8. 1.5 103 km NNW of Arctic Village, Alaska
  9. 2.1 121 km NNW of Arctic Village, Alaska
  10. 1.6 118 km NNW of Arctic Village, Alaska
  11. 1.7 123 km NNW of Arctic Village, Alaska
  12. 1.6 126 km NNW of Arctic Village, Alaska
  13. 1.5 128 km NNW of Arctic Village, Alaska
  14. 2.1 110 km NW of Arctic Village, Alaska
  15. 2.3 123 km NNW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2018-09-14 — it released about 350 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.