QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

Earthquake near Susitna North, AK

No earthquake was likely felt in Susitna North in the 24 hours to 3:56 pm AKST (00:56 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 2.7 earthquake was recorded 32 km (20 mi) west-northwest of Susitna North, AK, at 7:45 am AKST on 26 December 2020 (16:45 UTC), 10 km deep. 7 people have reported feeling it to USGS.

USGS: 7 km W of Trapper Creek, Alaska

7:45 am AKST, Dec 26, 2020 · · 10 km deep · released about 340 lb of TNT

Every earthquake near Susitna North Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 46 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
7:45 am AKST on 26 December 2020 ()
Where
32 km (20 mi) west-northwest of Susitna North, AK · earthquakes near Susitna North
Magnitude
M 2.7 (ml)
Depth
10 km below the surface
Felt
7 reports · strongest reported intensity III
Nearest
Matanuska-Susitna Borough, 46 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2078 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 23 km (14 mi) from the epicentre. In Susitna North, 32 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.

How big was it?

This earthquake released about 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 4.6 on 2020-11-26 — about 710 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 5.7 19 km E of Skwentna, Alaska · 50 km SW of this epicentre
  2. 5.4 25 km NNW of Willow, Alaska · 40 km SSE of this epicentre
  3. 5.4 36 km E of Skwentna, Alaska · 45 km SSW of this epicentre
  4. 5.1 29 km NNE of Petersville, Alaska · 46 km N of this epicentre
  5. 5.0 27 km NNE of Skwentna, Alaska · 45 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 62.3119, -150.3828. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Matanuska-Susitna Borough, AK 46 km (28 mi) E earthquakes near Matanuska-Susitna Borough

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

Aftershocks so far

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

  1. 2.1 11 km SSE of Talkeetna, Alaska
  2. 1.8 33 km NW of Willow, Alaska
  3. 1.5 16 km S of Susitna North, Alaska
  4. 1.6 2 km N of Petersville, Alaska
  5. 2.0 5 km SE of Talkeetna, Alaska
  6. 2.0 10 km NNE of Petersville, Alaska
  7. 2.4 37 km E of Skwentna, Alaska
  8. 2.3 11 km SSE of Trapper Creek, Alaska
  9. 2.4 21 km WSW of Trapper Creek, Alaska
  10. 1.8 34 km ENE of Skwentna, Alaska
  11. 1.7 22 km NNW of Chase, Alaska
  12. 2.0 28 km NW of Willow, Alaska
  13. 2.5 2 km NNE of Petersville, Alaska
  14. 1.6 34 km NW of Willow, Alaska
  15. 1.5 15 km SSW of Trapper Creek, 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.