QuakeIndex

Earthquake · reviewed by a seismologist

M 4.6ml

18 km SSW of Susitna North, Alaska

· 42 km deep · released about 120 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 39 kmAnchorage Municipality 101 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
Magnitude
M 4.6 (ml)
Depth
42 km below the surface
Felt
181 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Matanuska-Susitna Borough, 39 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2059 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 181 people have reported feeling it to USGS.

How big was it?

This earthquake released about 120 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 1,400× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 63× the energy of this one
  3. Magna, Utah 2020 M 5.7 45× the energy of this one
  4. This earthquake M 4.6 about 120 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 250× 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.

Where

Epicentre 62.0104, -150.0136. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Matanuska-Susitna Borough, AK 39 km (24 mi) SW of here earthquakes near Matanuska-Susitna Borough
Anchorage Municipality, AK 101 km (63 mi) NNW of here earthquakes near Anchorage Municipality

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. 2.3 12 km NNE of Willow, Alaska
  2. 1.7 15 km ENE of Willow, Alaska
  3. 1.6 26 km NW of Willow, Alaska
  4. 1.5 13 km WNW of Susitna North, Alaska
  5. 1.5 6 km N of Houston, Alaska
  6. 1.5 1 km WSW of Houston, Alaska
  7. 1.6 13 km NNW of Willow, Alaska
  8. 2.5 28 km NNW of Fishhook, Alaska
  9. 1.9 8 km WNW of Susitna North, Alaska
  10. 2.3 17 km E of Susitna North, Alaska
  11. 2.0 13 km S of Susitna North, Alaska
  12. 1.8 7 km ESE of Susitna North, Alaska
  13. 1.5 27 km NW of Fishhook, Alaska
  14. 2.5 14 km WNW of Fishhook, Alaska
  15. 1.9 16 km NW of Fishhook, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2017-08-21.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.