QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5mwr

15 km NNW of Four Mile Road, Alaska

· 19 km deep · released about 85 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 4.5 (mwr)
Depth
19 km below the surface
Felt
461 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Denali Borough, 123 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1401 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 461 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 89× the energy of this one
  3. Magna, Utah 2020 M 5.7 63× the energy of this one
  4. This earthquake M 4.5 about 85 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 180× 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 64.7370, -149.2346. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 123 km (77 mi) NNE of here earthquakes near Denali Borough
Yukon-Koyukuk Census Area, AK 131 km (81 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

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

  1. 1.7 23 km WNW of Four Mile Road, Alaska
  2. 1.6 16 km NNW of Four Mile Road, Alaska
  3. 1.6 18 km NNE of Four Mile Road, Alaska
  4. 1.5 13 km NW of Four Mile Road, Alaska
  5. 1.5 22 km NNE of Four Mile Road, Alaska
  6. 1.5 18 km SW of Minto, Alaska
  7. 1.6 25 km SW of Minto, Alaska
  8. 1.5 24 km SW of Minto, Alaska
  9. 1.9 25 km W of Anderson, Alaska
  10. 1.6 9 km N of Four Mile Road, Alaska
  11. 1.6 8 km SE of Nenana, Alaska
  12. 1.6 Central Alaska
  13. 1.6 17 km N of Four Mile Road, Alaska
  14. 1.8 30 km ESE of Minto, Alaska
  15. 1.9 32 km ESE of Minto, 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.

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

On USGS

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