QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5ml

Earthquake near Anchorage, AK

No earthquake was likely felt in Anchorage in the 24 hours to 2:14 am AKST (11:14 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 4.5 earthquake was recorded 22 km (13 mi) north-northwest of Anchorage, AK, at 11:27 am AKST on 30 November 2018 (20:27 UTC), 37 km deep. 3 people have reported feeling it to USGS.

USGS: 7 km WNW of Point MacKenzie, Alaska

22 km (14 mi) NNW of Anchorage, AK

11:27 am AKST, Nov 30, 2018 · · 37 km deep · released about 85 tons of TNT

Every earthquake near Anchorage Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 50 kmMatanuska-Susitna Borough 102 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
11:27 am AKST on 30 November 2018 ()
Where
22 km (13 mi) north-northwest of Anchorage, AK · earthquakes near Anchorage
Magnitude
M 4.5 (ml)
Depth
37 km below the surface
Felt
3 reports · strongest reported intensity VII
Measured shaking
intensity III (ShakeMap)
Nearest
Anchorage Municipality, 50 km ESE
Nearest mapped fault
Castle Mountain fault, 18 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1184 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 134 km (83 mi) from the epicentre. In Anchorage, 22 km away, the estimate is intensity III (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.

Likely felt in: Big Lake 17 km, intensity III · Anchorage 22 km, intensity III · Eagle River 29 km, intensity III · Knik-Fairview 30 km, intensity III · Willow 40 km, intensity III · Tanaina 44 km, intensity III. Estimated for each town centre; each link is that town's own record.

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.

For this area

The largest earthquake within 50 km since 2016 was M 7.1 on 2018-11-30 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists 25 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.8 27 km N of Beluga, Alaska · 50 km W of this epicentre
  2. 5.8 20 km ENE of Beluga, Alaska · 39 km WSW of this epicentre
  3. 5.6 11 km NW of Big Lake, Alaska · 21 km N of this epicentre
  4. 5.6 5 km N of Susitna, Alaska · 32 km NW of this epicentre
  5. 5.5 2 km ENE of Eagle River, Alaska · 31 km ESE 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 61.3885, -150.0982. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 50 km (31 mi) ESE earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 102 km (64 mi) NNE earthquakes near Matanuska-Susitna Borough
Kenai Peninsula Borough, AK 166 km (103 mi) SW earthquakes near Kenai Peninsula Borough

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

Aftershocks so far

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

  1. 1.7 9 km NNW of Point MacKenzie, Alaska
  2. 1.8 5 km NNW of Point MacKenzie, Alaska
  3. 2.3 5 km S of Big Lake, Alaska
  4. 3.8 5 km SW of Point MacKenzie, Alaska
  5. 3.0 5 km NNW of Point MacKenzie, Alaska
  6. 2.7 6 km NW of Point MacKenzie, Alaska
  7. 2.3 7 km WNW of Knik, Alaska
  8. 1.5 8 km NW of Point MacKenzie, Alaska
  9. 2.2 6 km NW of Point MacKenzie, Alaska
  10. 2.5 9 km S of Big Lake, Alaska
  11. 2.1 7 km NW of Point MacKenzie, Alaska
  12. 2.7 5 km NW of Point MacKenzie, Alaska
  13. 2.1 7 km NNW of Point MacKenzie, Alaska
  14. 2.2 5 km S of Big Lake, Alaska
  15. 3.6 8 km NW of Point MacKenzie, 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.