QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

28 km WSW of Salcha, Alaska

· 10 km deep · released about 1,300 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fairbanks North Star Borough 53 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 3.1 (ml)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Fairbanks North Star Borough, 53 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1607 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 1,300 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 250,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,900× the energy of this one
  4. This earthquake M 3.1 about 1,300 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.4× 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 64.4144, -147.4311. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fairbanks North Star Borough, AK 53 km (33 mi) WSW of here earthquakes near Fairbanks North Star Borough

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. 2.1 33 km SW of Salcha, Alaska
  2. 1.7 5 km SW of Salcha, Alaska
  3. 2.0 0 km SSW of North Pole, Alaska
  4. 2.0 22 km SW of Salcha, Alaska
  5. 2.5 9 km NE of Badger, Alaska
  6. 1.6 9 km WSW of North Pole, Alaska
  7. 1.9 7 km NE of Badger, Alaska
  8. 1.9 8 km NE of Badger, Alaska
  9. 1.9 32 km S of South Van Horn, Alaska
  10. 2.3 35 km S of South Van Horn, Alaska
  11. 1.9 24 km S of South Van Horn, Alaska
  12. 1.7 24 km SW of Salcha, Alaska
  13. 1.7 6 km SSW of South Van Horn, Alaska
  14. 2.0 34 km WSW of Salcha, Alaska
  15. 1.5 6 km SW of South Van Horn, 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 4.1 on 2021-11-05 — it released about 32 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.