QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8ml

15 km WSW of Trapper Creek, Alaska

· 18 km deep · released about 7.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 51 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 3.8 (ml)
Depth
18 km below the surface
Felt
47 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Matanuska-Susitna Borough, 51 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2573 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 47 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× 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 62.2489, -150.4966. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Matanuska-Susitna Borough, AK 51 km (32 mi) W of here earthquakes near Matanuska-Susitna Borough
Anchorage Municipality, AK 135 km (84 mi) NNW 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 11 km S of Trapper Creek, Alaska
  2. 1.6 16 km SSW of Trapper Creek, Alaska
  3. 1.6 23 km SSW of Petersville, Alaska
  4. 2.6 9 km N of Petersville, Alaska
  5. 1.8 1 km ESE of Talkeetna, Alaska
  6. 1.5 9 km S of Trapper Creek, Alaska
  7. 1.5 9 km SSE of Trapper Creek, Alaska
  8. 1.8 32 km SW of Trapper Creek, Alaska
  9. 2.6 11 km SE of Petersville, Alaska
  10. 1.9 30 km E of Skwentna, Alaska
  11. 3.1 33 km NW of Willow, Alaska
  12. 1.7 32 km SSW of Petersville, Alaska
  13. 1.5 29 km SW of Trapper Creek, Alaska
  14. 1.8 27 km ESE of Skwentna, Alaska
  15. 2.8 27 km ESE of Skwentna, 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 4.5 on 2016-01-18 — it released about 11 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.