QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8mwr

38 km W of Susitna, Alaska

· 14 km deep · released about 7.6 tons of TNT

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10 km30 km60 km120 km N Anchorage Municipality 109 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 3.8 (mwr)
Depth
14 km below the surface
Felt
60 reports · strongest reported intensity III
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Anchorage Municipality, 109 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1317 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 60 people have reported feeling it to USGS.

How big was it?

This earthquake released about 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× 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 61.4821, -151.2205. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 109 km (68 mi) WNW of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 125 km (78 mi) SW of here earthquakes near Matanuska-Susitna Borough

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

Aftershocks so far

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

  1. 1.7 Southern Alaska
  2. 1.5 41 km SSW of Skwentna, Alaska
  3. 1.5 13 km ENE of Beluga, Alaska
  4. 1.6 30 km SSW of Skwentna, Alaska
  5. 1.5 18 km WNW of Beluga, Alaska
  6. 1.6 18 km NNW of Beluga, Alaska
  7. 1.6 33 km S of Skwentna, Alaska
  8. 1.7 37 km NW of Beluga, Alaska
  9. 1.5 40 km NW of Beluga, Alaska
  10. 1.5 39 km W of Susitna, Alaska
  11. 2.2 23 km ESE of Skwentna, Alaska
  12. 1.5 29 km WNW of Tyonek, Alaska
  13. 1.7 18 km WNW of Beluga, Alaska
  14. 1.8 26 km NE of Beluga, Alaska
  15. 1.6 31 km NW of Beluga, 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 5.2 on 2019-09-17 — it released about 130 times the energy of this one.

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

On USGS

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