QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5ml

96 km WNW of Skwentna, Alaska

· 5.5 km deep · released about 2.9 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 3.5 (ml)
Depth
5.5 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 214 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 2.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 57,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,800× the energy of this one
  4. This earthquake M 3.5 about 2.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.2× 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 62.1751, -153.2006. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.8 99 km SE of Nikolai, Alaska
  2. 2.3 83 km NW of Skwentna, Alaska
  3. 1.7 92 km NW of Skwentna, Alaska
  4. 2.0 103 km SSE of Nikolai, Alaska
  5. 2.1 97 km WNW of Skwentna, Alaska
  6. 2.4 79 km WNW of Skwentna, Alaska
  7. 1.8 98 km SSE of Nikolai, Alaska
  8. 1.7 98 km SE of Nikolai, Alaska
  9. 1.6 101 km W of Skwentna, Alaska
  10. 2.5 89 km SSE of Nikolai, Alaska
  11. 2.3 98 km W of Skwentna, Alaska
  12. 1.7 100 km W of Skwentna, Alaska
  13. 2.0 101 km SSE of Nikolai, Alaska
  14. 1.9 100 km SSE of Nikolai, Alaska
  15. 2.1 108 km ENE of Lime 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.