QuakeIndex

Earthquake · reviewed by a seismologist

M 4.2mwr

15 km N of Four Mile Road, Alaska

· 15 km deep · released about 30 tons of TNT

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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 4.2 (mwr)
Depth
15 km below the surface
Felt
58 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Nearest
Denali Borough, 127 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 319 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 58 people have reported feeling it to USGS.

How big was it?

This earthquake released about 30 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 5,600× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 250× the energy of this one
  3. Magna, Utah 2020 M 5.7 180× the energy of this one
  4. This earthquake M 4.2 about 30 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 63× 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 64.7437, -149.0809. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 127 km (79 mi) NNE of here earthquakes near Denali Borough
Yukon-Koyukuk Census Area, AK 137 km (85 mi) ESE 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. 1.5 26 km E of Minto, Alaska
  2. 1.5 27 km N of Four Mile Road, Alaska
  3. 2.1 7 km ESE of Anderson, Alaska
  4. 2.1 14 km NW of Four Mile Road, Alaska
  5. 1.5 28 km E of Minto, Alaska
  6. 1.6 31 km SE of Minto, Alaska
  7. 1.9 18 km N of Four Mile Road, Alaska
  8. 1.7 19 km ESE of Nenana, Alaska
  9. 2.7 19 km NNW of Four Mile Road, Alaska
  10. 2.1 15 km N of Four Mile Road, Alaska
  11. 2.8 20 km NNE of Four Mile Road, Alaska
  12. 1.7 12 km NNE of Four Mile Road, Alaska
  13. 1.5 7 km WNW of Four Mile Road, Alaska
  14. 1.6 7 km NW of Four Mile Road, Alaska
  15. 1.8 20 km WNW of Anderson, 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 2.8 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.