QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

Earthquake near Sutton-Alpine, AK

No earthquake was likely felt in Sutton-Alpine in the 24 hours to 7:39 am AKST (16:39 UTC). The last one was M 4.4, 100 km (62 mi) E, at 11:11 am AKDT on 30 October 2026, estimated intensity II (weak) in town; 54 felt reports to USGS. Every earthquake near Sutton-Alpine

This page: a magnitude 3.1 earthquake was recorded 45 km (28 mi) east of Sutton-Alpine, AK, at 3:23 pm AKDT on 29 July 2024 (23:23 UTC), 10 km deep. 2 people have reported feeling it to USGS.

USGS: 27 km SE of Chickaloon, Alaska

3:23 pm AKDT, Jul 29, 2024 · · 10 km deep · released about 1,300 lb of TNT

Every earthquake near Sutton-Alpine Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 83 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
3:23 pm AKDT on 29 July 2024 ()
Where
45 km (28 mi) east of Sutton-Alpine, AK · earthquakes near Sutton-Alpine
Magnitude
M 3.1 (ml)
Depth
10 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Anchorage Municipality, 83 km SW
Nearest mapped fault
Castle Mountain fault, 23 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 763 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 41 km (25 mi) from the epicentre. In Sutton-Alpine, 45 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 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 4.8 on 2022-10-06 — about 350 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 31 km SSW of Glacier View, Alaska · 19 km SE of this epicentre
  2. 6.4 23 km S of Glacier View, Alaska · 21 km ESE of this epicentre
  3. 6.4 37 km SSE of Glacier View, Alaska · 38 km ESE of this epicentre
  4. 5.9 15 km N of Glacier View, Alaska · 39 km NNE of this epicentre
  5. 5.9 42 km S of Glacier View, Alaska · 34 km SE 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 61.6401, -148.0578. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 83 km (52 mi) SW earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 103 km (64 mi) NW earthquakes near Matanuska-Susitna Borough

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

Aftershocks so far

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

  1. 1.6 62 km S of Glacier View, Alaska
  2. 2.3 37 km S of Glacier View, Alaska
  3. 1.9 29 km SSW of Glacier View, Alaska
  4. 1.5 42 km SSW of Glacier View, Alaska
  5. 1.6 27 km SSW of Glacier View, Alaska
  6. 1.7 62 km S of Glacier View, Alaska
  7. 1.9 25 km NW of Glacier View, Alaska
  8. 2.4 41 km S of Glacier View, Alaska
  9. 1.8 45 km ESE of Knik River, Alaska
  10. 1.6 62 km S of Glacier View, Alaska
  11. 2.0 5 km N of Chickaloon, Alaska
  12. 1.5 58 km S of Glacier View, Alaska
  13. 1.5 27 km S of Chickaloon, Alaska
  14. 1.6 27 km S of Chickaloon, Alaska
  15. 1.6 58 km S of Glacier View, 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.