QuakeIndex

Earthquake · automatic estimate, may change

M 2.2ml

86 km E of Chiniak, Alaska

· 121 km deep · released about 60 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 2.2 (ml)
Depth
121 km below the surface
Felt
no reports yet
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 1902 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 57.7218, -150.8445. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.4 111 km E of Chiniak, Alaska
  2. 2.4 71 km ENE of Kodiak, Alaska
  3. 2.9 116 km ENE of Chiniak, Alaska
  4. 2.7 106 km ESE of Chiniak, Alaska
  5. 2.2 81 km ENE of Kodiak, Alaska
  6. 2.5 87 km ENE of Ouzinkie, Alaska
  7. 3.0 99 km ENE of Kodiak, Alaska
  8. 3.5 74 km ESE of Chiniak, Alaska
  9. 2.0 100 km ENE of Kodiak, Alaska
  10. 4.4 68 km ENE of Kodiak, Alaska
  11. 2.5 93 km ENE of Kodiak, Alaska
  12. 2.8 59 km ENE of Chiniak, Alaska
  13. 2.3 56 km ENE of Chiniak, Alaska
  14. 2.2 67 km ENE of Kodiak, Alaska
  15. 2.2 117 km ENE of Chiniak, 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.