QuakeIndex

Earthquake · automatic estimate, may change

M 1.5ml

110 km E of Cordova, Alaska

· 20 km deep · released about 5.4 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 1.5 (ml)
Depth
20 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 363 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 60.4489, -143.7548. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.8 126 km S of McCarthy, Alaska
  2. 1.5 133 km S of McCarthy, Alaska
  3. 1.5 122 km SSW of McCarthy, Alaska
  4. 1.8 137 km S of McCarthy, Alaska
  5. 1.7 105 km SSW of McCarthy, Alaska
  6. 1.6 87 km SSW of McCarthy, Alaska
  7. 1.7 124 km SSW of McCarthy, Alaska
  8. 3.0 138 km ESE of Cordova, Alaska
  9. 1.5 130 km S of McCarthy, Alaska
  10. 1.8 133 km S of McCarthy, Alaska
  11. 2.5 113 km S of McCarthy, Alaska
  12. 1.7 118 km SSW of McCarthy, Alaska
  13. 1.6 71 km SSW of McCarthy, Alaska
  14. 1.5 119 km ESE of Cordova, Alaska
  15. 1.8 112 km ESE of Cordova, 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.