QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

Earthquake near Susitna North, AK

No earthquake was likely felt in Susitna North in the 24 hours to 7:52 am AKST (16:52 UTC). The last one was M 3.6, 19 km (12 mi) E, at 9:16 am AKDT on 27 October 2026, estimated intensity II (weak) in town; 17 felt reports to USGS. Every earthquake near Susitna North

This page: a magnitude 2.8 earthquake was recorded 23 km (15 mi) south of Susitna North, AK, at 1:51 pm AKDT on 18 October 2025 (21:51 UTC), 12 km deep. 1 person has reported feeling it to USGS.

USGS: 23 km S of Susitna North, Alaska

82 km (51 mi) N of Anchorage, AK

1:51 pm AKDT, Oct 18, 2025 · · 12 km deep · released about 480 lb of TNT

Every earthquake near Susitna North Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 40 kmAnchorage Municipality 92 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
1:51 pm AKDT on 18 October 2025 ()
Where
23 km (15 mi) south of Susitna North, AK · earthquakes near Susitna North
Magnitude
M 2.8 (ml)
Depth
12 km below the surface
Felt
1 report · strongest reported intensity I
Measured shaking
intensity II (ShakeMap)
Nearest
Matanuska-Susitna Borough, 40 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 308 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 24 km (15 mi) from the epicentre. In Susitna North, 23 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.

Likely felt in: Susitna North 23 km, intensity II · Willow 24 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 5.1 on 2020-11-07 — about 2,800 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 5.9 23 km NE of Willow, Alaska · 8 km SE of this epicentre
  2. 5.8 14 km NNE of Fishhook, Alaska · 41 km ESE of this epicentre
  3. 5.6 11 km NW of Big Lake, Alaska · 43 km SSW of this epicentre
  4. 5.4 25 km NNW of Willow, Alaska · 14 km W of this epicentre
  5. 5.4 36 km E of Skwentna, Alaska · 44 km W 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 61.9511, -149.8671. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Matanuska-Susitna Borough, AK 40 km (25 mi) NNE earthquakes near Matanuska-Susitna Borough
Anchorage Municipality, AK 92 km (57 mi) SSE 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. 1.6 6 km ENE of Susitna North, Alaska
  2. 1.8 8 km NNE of Meadow Lakes, Alaska
  3. 2.0 6 km NNE of Willow, Alaska
  4. 1.5 28 km ENE of Susitna North, Alaska
  5. 1.9 12 km W of Houston, Alaska
  6. 1.9 8 km ENE of Willow, Alaska
  7. 1.6 7 km NE of Willow, Alaska
  8. 2.2 8 km NNW of Willow, Alaska
  9. 1.8 7 km N of Willow, Alaska
  10. 2.0 6 km NNW of Willow, Alaska
  11. 1.5 5 km NNW of Willow, Alaska
  12. 1.8 9 km NNE of Houston, Alaska
  13. 1.6 10 km NNE of Houston, Alaska
  14. 1.5 19 km N of Meadow Lakes, Alaska
  15. 1.8 20 km N of Meadow Lakes, 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.