QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mw

27 km ESE of Susitna North, Alaska

· 38 km deep · released about 21 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 25 kmAnchorage Municipality 97 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 4.1 (mw)
Depth
38 km below the surface
Felt
90 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Matanuska-Susitna Borough, 25 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1152 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 90 people have reported feeling it to USGS.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 62.0490, -149.3910. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Matanuska-Susitna Borough, AK 25 km (15 mi) SSE of here earthquakes near Matanuska-Susitna Borough
Anchorage Municipality, AK 97 km (61 mi) N of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 1.5 41 km ENE of Susitna North, Alaska
  2. 2.1 42 km ENE of Susitna North, Alaska
  3. 1.6 5 km N of Houston, Alaska
  4. 1.6 10 km N of Meadow Lakes, Alaska
  5. 1.8 40 km E of Susitna North, Alaska
  6. 1.7 14 km N of Meadow Lakes, Alaska
  7. 2.4 2 km ESE of Susitna North, Alaska
  8. 1.8 Southern Alaska
  9. 2.4 20 km NNE of Fishhook, Alaska
  10. 1.5 12 km NNE of Willow, Alaska
  11. 1.8 5 km NW of Tanaina, Alaska
  12. 1.5 23 km WNW of Fishhook, Alaska
  13. 2.0 17 km NNE of Houston, Alaska
  14. 2.0 8 km SE of Susitna North, Alaska
  15. 2.5 28 km NE 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2016-04-17.

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

On USGS

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