QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mb

42 km ESE of Denali Park, Alaska

· 9.3 km deep · released about 21 tons of TNT

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10 km30 km60 km120 km N Denali Borough 95 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 4.1 (mb)
Depth
9.3 km below the surface
Felt
4 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Denali Borough, 95 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1338 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 63.6188, -148.1008. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 95 km (59 mi) E of here earthquakes near Denali Borough
Fairbanks North Star Borough, AK 140 km (87 mi) SW of here earthquakes near Fairbanks North Star Borough

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

Aftershocks so far

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

  1. 2.0 64 km ESE of Denali Park, Alaska
  2. 2.6 61 km ESE of Denali Park, Alaska
  3. 2.2 28 km ESE of Cantwell, Alaska
  4. 1.5 33 km E of Healy, Alaska
  5. 1.6 67 km ENE of Cantwell, Alaska
  6. 1.5 70 km E of Cantwell, Alaska
  7. 1.7 61 km ESE of Denali Park, Alaska
  8. 3.5 Central Alaska
  9. 1.9 19 km NE of Cantwell, Alaska
  10. 1.5 63 km ESE of Denali Park, Alaska
  11. 3.0 63 km ESE of Denali Park, Alaska
  12. 1.6 17 km ENE of Healy, Alaska
  13. 1.5 26 km E of Denali Park, Alaska
  14. 1.7 20 km NE of Healy, Alaska
  15. 1.5 21 km E of Healy, 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.