QuakeIndex

ice quake · reviewed by a seismologist

M 1.9ml

112 km E of Cordova, Alaska

· 0.0 km deep · released about 21 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 1.9 (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 1826 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 60.4459, -143.7222. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.9 108 km S of McCarthy, Alaska
  2. 2.4 124 km SSW of McCarthy, Alaska
  3. 1.6 102 km SSW of McCarthy, Alaska
  4. 1.5 109 km S of McCarthy, Alaska
  5. 2.7 Southern Alaska
  6. 1.5 Southern Alaska
  7. 1.8 125 km S of McCarthy, Alaska
  8. 1.6 106 km E of Cordova, Alaska
  9. 1.6 107 km E of Cordova, Alaska
  10. 1.6 104 km E of Cordova, Alaska
  11. 1.5 123 km SSW of McCarthy, Alaska
  12. 1.9 122 km SSW of McCarthy, Alaska
  13. 1.7 105 km E of Cordova, Alaska
  14. 1.6 104 km E of Cordova, Alaska
  15. 1.6 126 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.