QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mb

67 km W of Cantwell, Alaska

· 133 km deep · released about 15 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Denali Borough 31 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 4.0 (mb)
Depth
133 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Denali Borough, 31 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1475 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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 63.4323, -150.3036. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 31 km (19 mi) SSW of here earthquakes near Denali 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. 2.3 72 km SE of Denali National Park, Alaska
  2. 2.2 68 km N of Petersville, Alaska
  3. 3.1 63 km ESE of Denali National Park, Alaska
  4. 2.4 62 km SE of Denali National Park, Alaska
  5. 3.2 62 km SE of Denali National Park, Alaska
  6. 2.0 64 km NNE of Petersville, Alaska
  7. 1.5 57 km WSW of Denali Park, Alaska
  8. 1.6 60 km SE of Denali National Park, Alaska
  9. 1.8 65 km N of Petersville, Alaska
  10. 2.1 58 km N of Petersville, Alaska
  11. 1.5 64 km SE of Denali National Park, Alaska
  12. 1.7 64 km NNE of Petersville, Alaska
  13. 1.6 57 km NNE of Petersville, Alaska
  14. 2.1 64 km SE of Denali National Park, Alaska
  15. 1.5 48 km WSW of Cantwell, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.0 on 2018-07-01 — it released about 32 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.