QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

21 km ENE of Four Mile Road, Alaska

· 18 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Fairbanks North Star Borough 105 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 1.8 (ml)
Depth
18 km below the surface
Felt
no reports yet
Nearest
Fairbanks North Star Borough, 105 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2333 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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.

Where

Epicentre 64.6746, -148.7102. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Fairbanks North Star Borough, AK 105 km (65 mi) W of here earthquakes near Fairbanks North Star Borough
Denali Borough, AK 127 km (79 mi) NNE of here earthquakes near Denali Borough

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

Aftershocks so far

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

  1. 1.6 11 km NNW of Four Mile Road, Alaska
  2. 2.7 17 km NNW of Four Mile Road, Alaska
  3. 2.0 1 km SE of Anderson, Alaska
  4. 2.6 2 km W of Anderson, Alaska
  5. 2.3 32 km SE of Minto, Alaska
  6. 1.7 19 km NNE of Four Mile Road, Alaska
  7. 2.7 Central Alaska
  8. 2.5 25 km NNE of Four Mile Road, Alaska
  9. 2.3 27 km N of Four Mile Road, Alaska
  10. 1.6 28 km NNE of Four Mile Road, Alaska
  11. 1.5 17 km NNW of Four Mile Road, Alaska
  12. 1.8 19 km NNE of Four Mile Road, Alaska
  13. 2.2 15 km E of Clear, Alaska, Alaska
  14. 1.7 22 km ENE of Nenana, Alaska
  15. 2.1 18 km NNE of Four Mile Road, 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 4.5 on 2019-04-11 — it released about 11,000 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.