QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

Earthquake near Anchorage, AK

No earthquake was likely felt in Anchorage in the 24 hours to 3:15 am AKST (12:15 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 2.2 earthquake was recorded 47 km (29 mi) north-northwest of Anchorage, AK, at 2:29 pm AKDT on 3 April 2017 (22:29 UTC), 55 km deep. 1 person has reported feeling it to USGS.

USGS: 14 km ENE of Susitna, Alaska

47 km (29 mi) NNW of Anchorage, AK

2:29 pm AKDT, Apr 3, 2017 · · 55 km deep · released about 60 lb of TNT

Every earthquake near Anchorage Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 71 kmMatanuska-Susitna Borough 84 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
2:29 pm AKDT on 3 April 2017 ()
Where
47 km (29 mi) north-northwest of Anchorage, AK · earthquakes near Anchorage
Magnitude
M 2.2 (ml)
Depth
55 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
Anchorage Municipality, 71 km SE
Nearest mapped fault
Castle Mountain fault, 8 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 1194 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, 47 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: Big Lake, Willow, Houston.

How big was it?

This earthquake released about 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 4.3 on 2016-02-28 — about 1,400 times the energy of this one.

Before 2016, the USGS record lists 24 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.9 27 km SE of Skwentna, Alaska · 46 km WNW of this epicentre
  2. 5.9 23 km NE of Willow, Alaska · 44 km NE of this epicentre
  3. 5.8 27 km N of Beluga, Alaska · 47 km WSW of this epicentre
  4. 5.8 20 km ENE of Beluga, Alaska · 49 km SSW of this epicentre
  5. 5.6 11 km NW of Big Lake, Alaska · 8 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 61.6053, -150.2642. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Anchorage Municipality, AK 71 km (44 mi) SE earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 84 km (52 mi) NNE earthquakes near Matanuska-Susitna Borough

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. 1.9 10 km E of Willow, Alaska
  2. 1.8 25 km SSW of Susitna, Alaska
  3. 1.8 15 km SW of Willow, Alaska
  4. 1.8 23 km NNW of Susitna, Alaska
  5. 2.2 8 km NE of Point MacKenzie, Alaska
  6. 1.6 7 km SE of Point MacKenzie, Alaska
  7. 1.5 5 km W of Houston, Alaska
  8. 1.5 21 km SSW of Susitna, Alaska
  9. 1.9 8 km SSW of Big Lake, Alaska
  10. 2.2 5 km SSW of Big Lake, Alaska
  11. 2.3 10 km E of Point MacKenzie, Alaska
  12. 1.6 4 km S of Houston, Alaska
  13. 2.0 6 km NNE of Willow, Alaska
  14. 1.8 33 km NNW of Susitna, Alaska
  15. 3.4 18 km SSW of Susitna North, 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.