QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5mw

31 km SW of Trapper Creek, Alaska

· 10 km deep · released about 85 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 62 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 4.5 (mw)
Depth
10 km below the surface
Felt
437 reports · strongest reported intensity V
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Nearest
Matanuska-Susitna Borough, 62 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1156 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 437 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 89× the energy of this one
  3. Magna, Utah 2020 M 5.7 63× the energy of this one
  4. This earthquake M 4.5 about 85 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 180× 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 62.1032, -150.6400. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Matanuska-Susitna Borough, AK 62 km (38 mi) WSW of here earthquakes near Matanuska-Susitna Borough
Anchorage Municipality, AK 126 km (78 mi) NW of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 2.2 13 km SW of Petersville, Alaska
  2. 1.6 18 km N of Susitna, Alaska
  3. 1.8 31 km WNW of Willow, Alaska
  4. 1.6 25 km NNW of Susitna, Alaska
  5. 1.8 28 km NNW of Susitna, Alaska
  6. 2.1 29 km NNW of Susitna, Alaska
  7. 4.3 27 km NNW of Susitna, Alaska
  8. 1.7 32 km NE of Skwentna, Alaska
  9. 2.0 23 km SSW of Trapper Creek, Alaska
  10. 1.7 14 km NW of Willow, Alaska
  11. 1.5 26 km SE of Skwentna, Alaska
  12. 1.6 26 km WSW of Trapper Creek, Alaska
  13. 1.8 9 km SE of Petersville, Alaska
  14. 1.8 27 km NW of Susitna, Alaska
  15. 1.6 13 km WSW of Petersville, 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.