QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Anchorage, AK

No earthquake was likely felt in Anchorage in the 24 hours to 1:55 am AKST (10:55 UTC). The last one was M 3.5, 39 km (24 mi) SSW, at 4:48 pm AKDT on 27 October 2026, estimated intensity II (weak) in town; 98 felt reports to USGS. Every earthquake near Anchorage

This page: a magnitude 1.8 earthquake was recorded 11 km (7 mi) south-southeast of Anchorage, AK, at 11:30 pm AKST on 29 November 2023 (08:30 UTC), 38 km deep. 1 person has reported feeling it to USGS.

USGS: 11 km SSE of Anchorage, Alaska

11 km (7 mi) SSE of Anchorage, AK

11:30 pm AKST, Nov 29, 2023 · · 38 km deep · released about 15 lb of TNT

Every earthquake near Anchorage Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 30 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
11:30 pm AKST on 29 November 2023 ()
Where
11 km (7 mi) south-southeast of Anchorage, AK · earthquakes near Anchorage
Magnitude
M 1.8 (ml)
Depth
38 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Anchorage Municipality, 30 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1066 days ago

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

At this magnitude and depth it was probably too small to be felt, even directly above it. In Anchorage, 11 km away, the estimate is intensity I (not felt). 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: Elmendorf Air Force Base, Eagle River.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 7.1 on 2018-11-30 — about 89,000,000 times the energy of this one.

Before 2016, the USGS record lists 14 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.7 13 km S of Girdwood, Alaska · 49 km SE of this epicentre
  2. 5.5 2 km ENE of Eagle River, Alaska · 29 km NE of this epicentre
  3. 5.5 26 km SSW of Anchorage, Alaska · 20 km SW of this epicentre
  4. 5.3 12 km S of Susitna, Alaska · 50 km NW of this epicentre
  5. 5.3 8 km NW of Knik-Fairview, Alaska · 50 km N 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 61.1214, -149.8364. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 30 km (19 mi) ENE earthquakes near Anchorage Municipality

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. 1.7 2 km S of Big Lake, Alaska
  2. 1.6 8 km SSE of Point MacKenzie, Alaska
  3. 1.6 13 km SSW of Gateway, Alaska
  4. 1.6 2 km SSE of Big Lake, Alaska
  5. 1.8 4 km S of Knik, Alaska
  6. 1.6 6 km SSE of Anchorage, Alaska
  7. 1.6 18 km E of Point Possession, Alaska
  8. 1.9 2 km SSE of Big Lake, Alaska
  9. 2.1 12 km SSW of Hope, Alaska
  10. 1.5 26 km WSW of Anchorage, Alaska
  11. 1.7 6 km ESE of Point MacKenzie, Alaska
  12. 1.5 3 km W of Knik, Alaska
  13. 1.8 6 km WSW of Hope, Alaska
  14. 1.6 4 km SSE of Big Lake, Alaska
  15. 1.6 6 km NNW of Anchorage, 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.