QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

Earthquake near Susitna North, AK

No earthquake was likely felt in Susitna North in the 24 hours to 6:24 am AKST (15:24 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 2.2 earthquake was recorded 47 km (29 mi) northeast of Susitna North, AK, at 8:37 am AKDT on 18 July 2016 (16:37 UTC), 58 km deep.

USGS: 42 km E of Chase, Alaska

8:37 am AKDT, Jul 18, 2016 · · 58 km deep · released about 60 lb of TNT

Every earthquake near Susitna North Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 27 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
8:37 am AKDT on 18 July 2016 ()
Where
47 km (29 mi) northeast of Susitna North, AK · earthquakes near Susitna North
Magnitude
M 2.2 (ml)
Depth
58 km below the surface
Felt
no reports yet
Nearest
Matanuska-Susitna Borough, 27 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1198 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 Susitna North, 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.

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 4.6 on 2016-04-26 — about 4,000 times the energy of this one.

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

  1. 5.8 37 km ENE of Susitna North, Alaska · 21 km SSE of this epicentre
  2. 5.4 54 km NE of Chase, Alaska · 43 km NNW of this epicentre
  3. 5.1 25 km ENE of Susitna North, Alaska · 27 km SSW of this epicentre
  4. 5.1 49 km NE of Chase, Alaska · 38 km NNW of this epicentre
  5. 5.0 70 km ENE of Chase, Alaska · 33 km NE 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 62.4844, -149.2756. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Matanuska-Susitna Borough, AK 27 km (17 mi) SSW 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. 2.6 14 km SE of Susitna North, Alaska
  2. 1.6 14 km NNE of Susitna North, Alaska
  3. 2.4 27 km E of Susitna North, Alaska
  4. 1.5 59 km NE of Chase, Alaska
  5. 1.6 57 km ENE of Chase, Alaska
  6. 2.0 33 km NE of Chase, Alaska
  7. 2.0 47 km NNE of Chase, Alaska
  8. 1.5 10 km ESE of Susitna North, Alaska
  9. 1.9 56 km NNE of Chase, Alaska
  10. 1.7 20 km ENE of Talkeetna, Alaska
  11. 1.7 44 km ENE of Susitna North, Alaska
  12. 1.5 41 km ENE of Susitna North, Alaska
  13. 2.1 42 km ENE of Susitna North, Alaska
  14. 1.7 41 km ENE of Chase, Alaska
  15. 1.6 48 km NNE of Chase, 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.