QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mwr

16 km NNW of Four Mile Road, Alaska

· 17 km deep · released about 2.7 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 3.5 (mwr)
Depth
17 km below the surface
Felt
134 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Denali Borough, 124 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1412 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 134 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 63,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,000× the energy of this one
  4. This earthquake M 3.5 about 2.7 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.6× 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 64.7430, -149.2060. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 124 km (77 mi) NNE of here earthquakes near Denali Borough
Yukon-Koyukuk Census Area, AK 132 km (82 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. 1.5 18 km SW of Minto, Alaska
  2. 1.6 25 km SW of Minto, Alaska
  3. 1.5 24 km SW of Minto, Alaska
  4. 1.6 9 km N of Four Mile Road, Alaska
  5. 1.6 8 km SE of Nenana, Alaska
  6. 1.6 Central Alaska
  7. 1.6 17 km N of Four Mile Road, Alaska
  8. 1.8 30 km ESE of Minto, Alaska
  9. 1.9 32 km ESE of Minto, Alaska
  10. 1.8 30 km ESE of Minto, Alaska
  11. 2.5 19 km WSW of Nenana, Alaska
  12. 2.1 27 km N of Four Mile Road, Alaska
  13. 1.6 27 km SW of Minto, Alaska
  14. 2.4 27 km SW of Minto, Alaska
  15. 1.8 19 km NNW 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 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.