QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

Earthquake near Eagle River, AK

No earthquake was likely felt in Eagle River in the 24 hours to 4:14 am AKST (13:14 UTC). The last one was M 3.6, 20 km (12 mi) NNW, at 6:49 am AKDT on 16 October 2026, estimated intensity II (weak) in town; 485 felt reports to USGS. Every earthquake near Eagle River

This page: a magnitude 2.3 earthquake was recorded 33 km (20 mi) east of Eagle River, AK, at 3:38 pm AKST on 28 December 2023 (00:38 UTC), 9.9 km deep.

USGS: 9 km SSW of Knik River, Alaska

53 km (33 mi) ENE of Anchorage, AK

3:38 pm AKST, Dec 28, 2023 · · 9.9 km deep · released about 85 lb of TNT

Every earthquake near Eagle River Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 28 kmMatanuska-Susitna Borough 103 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
3:38 pm AKST on 28 December 2023 ()
Where
33 km (20 mi) east of Eagle River, AK · earthquakes near Eagle River
Magnitude
M 2.3 (ml)
Depth
9.9 km below the surface
Felt
no reports yet
Nearest
Anchorage Municipality, 28 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 986 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 17 km (11 mi) from the epicentre. In Eagle River, 33 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Earthquakes near other towns within 30 km: Butte, Palmer, Gateway, Lazy Mountain.

How big was it?

This earthquake released about 85 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 180,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 11× the energy of this one
  4. This earthquake M 2.3 about 85 lb of TNT

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.

For this area

The largest earthquake within 50 km since 2016 was M 4.1 on 2020-10-15 — about 500 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.0 21 km N of Whittier, Alaska · 48 km SSE of this epicentre
  2. 5.5 2 km ENE of Eagle River, Alaska · 30 km W of this epicentre
  3. 5.3 8 km NW of Knik-Fairview, Alaska · 45 km WNW of this epicentre
  4. 5.3 13 km ESE of Eagle River, Alaska · 21 km WSW of this epicentre
  5. 5.1 7 km SSW of Elmendorf Air Force Base, Alaska · 44 km WSW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 61.3769, -148.9681. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 28 km (18 mi) SW earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 103 km (64 mi) NNW 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 6 km N of Buffalo Soapstone, Alaska
  2. 1.6 21 km SE of Elmendorf Air Force Base, Alaska
  3. 1.7 4 km ENE of Fishhook, Alaska
  4. 1.5 12 km E of Eagle River, Alaska
  5. 1.6 13 km SSW of Gateway, Alaska
  6. 1.5 13 km SE of Elmendorf Air Force Base, Alaska
  7. 2.3 3 km NW of Tanaina, Alaska
  8. 1.6 12 km E of Elmendorf Air Force Base, Alaska
  9. 1.6 29 km ENE of Girdwood, Alaska
  10. 2.5 26 km NE of Girdwood, Alaska
  11. 2.0 25 km ESE of Knik River, Alaska
  12. 1.6 33 km NNE of Whittier, Alaska
  13. 1.9 33 km NNE of Whittier, Alaska
  14. 1.9 33 km NNE of Whittier, Alaska
  15. 1.9 14 km SE 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.

On USGS

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