QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7ml

42 km ESE of Cantwell, Alaska

· 72 km deep · released about 5.4 tons of TNT

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10 km30 km60 km120 km N Denali Borough 103 km
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 3.7 (ml)
Depth
72 km below the surface
Felt
no reports yet
Nearest
Denali Borough, 103 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1139 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× more

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 63.3048, -148.1228. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 103 km (64 mi) ESE of here earthquakes near Denali Borough
Matanuska-Susitna Borough, AK 135 km (84 mi) NNE of here earthquakes near Matanuska-Susitna Borough

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

Aftershocks so far

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

  1. 1.5 33 km SE of Cantwell, Alaska
  2. 1.6 55 km SSE of Cantwell, Alaska
  3. 1.5 54 km ENE of Cantwell, Alaska
  4. 2.0 62 km ENE of Cantwell, Alaska
  5. 2.3 48 km SE of Cantwell, Alaska
  6. 1.7 52 km SE of Cantwell, Alaska
  7. 1.7 53 km ENE of Cantwell, Alaska
  8. 1.6 24 km SE of McKinley Park, Alaska
  9. 2.6 31 km SE of McKinley Park, Alaska
  10. 1.9 65 km E of Cantwell, Alaska
  11. 1.5 19 km E of Cantwell, Alaska
  12. 1.7 39 km ENE of Cantwell, Alaska
  13. 2.3 61 km SE of Cantwell, Alaska
  14. 1.6 30 km SSE of Cantwell, Alaska
  15. 1.5 63 km ESE of McKinley Park, 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.