QuakeIndex

ice quake · reviewed by a seismologist

M 2.2ml

143 km ESE of Cordova, Alaska

· 0.0 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
0.0 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2502 days ago

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

USGS catalogues this as ice quake, not an earthquake.

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 60.1477, -143.2835. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.6 103 km S of McCarthy, Alaska
  2. 1.6 104 km S of McCarthy, Alaska
  3. 2.1 109 km S of McCarthy, Alaska
  4. 2.1 107 km S of McCarthy, Alaska
  5. 2.0 122 km S of McCarthy, Alaska
  6. 1.9 124 km SSW of McCarthy, Alaska
  7. 2.5 123 km SSW of McCarthy, Alaska
  8. 2.0 122 km S of McCarthy, Alaska
  9. 1.6 103 km S of McCarthy, Alaska
  10. 1.6 101 km S of McCarthy, Alaska
  11. 2.6 125 km SSW of McCarthy, Alaska
  12. 1.7 103 km S of McCarthy, Alaska
  13. 2.3 107 km SSW of McCarthy, Alaska
  14. 1.6 131 km S of McCarthy, Alaska
  15. 1.8 129 km S of McCarthy, 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.