QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mw

15 km ESE of Chickaloon, Alaska

· 15 km deep · released about 15 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 87 kmMatanuska-Susitna Borough 90 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 (mw)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 87 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1153 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

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 61.7490, -148.1806. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 87 km (54 mi) NE of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 90 km (56 mi) SE 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

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

  1. 1.5 16 km ESE of Chickaloon, Alaska
  2. 1.7 14 km ESE of Chickaloon, Alaska
  3. 1.6 15 km ESE of Chickaloon, Alaska
  4. 1.6 15 km SE of Chickaloon, Alaska
  5. 1.7 16 km ESE of Chickaloon, Alaska
  6. 2.3 13 km ESE of Chickaloon, Alaska
  7. 4.1 14 km ESE of Chickaloon, Alaska
  8. 1.8 43 km E of Knik River, Alaska
  9. 1.7 22 km WSW of Glacier View, Alaska
  10. 2.5 16 km S of Glacier View, Alaska
  11. 1.5 20 km NNE of Chickaloon, Alaska
  12. 1.9 Southern Alaska
  13. 1.5 16 km NE of Chickaloon, Alaska
  14. 1.9 40 km SSW of Glacier View, Alaska
  15. 1.7 22 km S of Glacier View, 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.