QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8ml

25 km ESE of Elmendorf Air Force Base, Alaska

· 36 km deep · released about 7.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 6 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
36 km below the surface
Felt
272 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Anchorage Municipality, 6 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2150 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 272 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 61.1857, -149.1828. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 6 km (3 mi) ENE of here earthquakes near Anchorage Municipality

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 3 km WSW of Hope, Alaska
  2. 2.6 18 km ESE of Elmendorf Air Force Base, Alaska
  3. 1.5 4 km SW of Lazy Mountain, Alaska
  4. 1.8 19 km NW of Girdwood, Alaska
  5. 2.3 18 km N of Hope, Alaska
  6. 1.6 15 km ESE of Elmendorf Air Force Base, Alaska
  7. 1.6 17 km SSE of Anchorage, Alaska
  8. 1.8 13 km ESE of Elmendorf Air Force Base, Alaska
  9. 1.8 26 km N of Girdwood, Alaska
  10. 1.9 4 km WSW of Knik-Fairview, AK
  11. 2.0 21 km ESE of Elmendorf Air Force Base, Alaska
  12. 2.1 13 km N of Girdwood, Alaska
  13. 2.0 9 km E of Girdwood, Alaska
  14. 1.8 5 km W of Elmendorf Air Force Base, Alaska
  15. 1.5 13 km ESE of Knik River, 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 4.4 on 2018-11-30 — it released about 7.9 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.