QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

103 km ESE of Cordova, Alaska

· 23 km deep · released about 11 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 1.7 (ml)
Depth
23 km below the surface
Felt
no reports yet
Nearest
Chugach Census Area, 122 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1528 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 60.0491, -144.1679. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chugach Census Area, AK 122 km (76 mi) ESE of here earthquakes near Chugach Census Area

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.3 109 km E of Cordova, Alaska
  2. 1.7 112 km E of Cordova, Alaska
  3. 1.7 61 km ESE of Cordova, Alaska
  4. 1.5 119 km ESE of Cordova, Alaska
  5. 1.8 112 km ESE of Cordova, Alaska
  6. 2.0 106 km E of Cordova, Alaska
  7. 1.6 104 km E of Cordova, Alaska
  8. 1.7 102 km E of Cordova, Alaska
  9. 1.6 106 km E of Cordova, Alaska
  10. 2.2 115 km ESE of Cordova, Alaska
  11. 2.3 115 km E of Cordova, Alaska
  12. 1.5 112 km E of Cordova, Alaska
  13. 2.7 113 km E of Cordova, Alaska
  14. 1.6 77 km ESE of Cordova, Alaska
  15. 1.9 115 km E 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.