QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

113 km E of Cordova, Alaska

· 6.8 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N
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
6.8 km below the surface
Felt
1 report · strongest reported intensity II
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 407 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

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 60.3784, -143.7258. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 1.7 124 km SSW of McCarthy, Alaska
  2. 3.0 138 km ESE of Cordova, Alaska
  3. 1.5 130 km S of McCarthy, Alaska
  4. 1.8 133 km S of McCarthy, Alaska
  5. 2.5 113 km S of McCarthy, Alaska
  6. 1.7 118 km SSW of McCarthy, Alaska
  7. 1.5 119 km ESE of Cordova, Alaska
  8. 1.8 112 km ESE of Cordova, Alaska
  9. 1.6 112 km S of McCarthy, Alaska
  10. 1.7 132 km ESE of Cordova, Alaska
  11. 1.7 104 km SSW of McCarthy, Alaska
  12. 2.0 106 km E of Cordova, Alaska
  13. 1.7 96 km SSW of McCarthy, Alaska
  14. 1.7 133 km S of McCarthy, Alaska
  15. 1.6 134 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.