QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7ml

5 km W of Four Mile Road, Alaska

· 10 km deep · released about 5.4 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Denali Borough 110 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 3.7 (ml)
Depth
10 km below the surface
Felt
37 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Denali Borough, 110 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 442 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 37 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.4 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 32,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.4 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× 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 64.6076, -149.2355. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 110 km (68 mi) NNE of here earthquakes near Denali Borough
Yukon-Koyukuk Census Area, AK 139 km (87 mi) SE of here earthquakes near Yukon-Koyukuk Census Area

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. 1.7 8 km WNW of Four Mile Road, Alaska
  2. 1.6 37 km NNE of Four Mile Road, Alaska
  3. 1.5 34 km NNE of Four Mile Road, Alaska
  4. 1.6 13 km N of Four Mile Road, Alaska
  5. 1.7 30 km S of Minto, Alaska
  6. 1.8 26 km S of Minto, Alaska
  7. 1.5 6 km WNW of Four Mile Road, Alaska
  8. 1.7 31 km SSE of Minto, Alaska
  9. 1.5 29 km SSE of Minto, Alaska
  10. 3.4 31 km SSE of Minto, Alaska
  11. 1.9 27 km SSE of Minto, Alaska
  12. 3.2 35 km WNW of Ester, Alaska
  13. 1.6 30 km SSE of Minto, Alaska
  14. 2.0 25 km N of Four Mile Road, Alaska
  15. 1.6 9 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 16 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.