QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

7 km N of Eureka Roadhouse, Alaska

· 40 km deep · released about 1.3 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 3.3 (ml)
Depth
40 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Anchorage Municipality, 146 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 897 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 130,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 5,600× the energy of this one
  3. Magna, Utah 2020 M 5.7 4,000× the energy of this one
  4. This earthquake M 3.3 about 1.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.8× 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 62.0008, -147.1462. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 146 km (91 mi) NE of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 3.3 18 km SSE of Eureka Roadhouse, Alaska
  2. 1.9 30 km SSE of Eureka Roadhouse, Alaska
  3. 1.6 14 km SSW of Nelchina, Alaska
  4. 1.7 20 km S of Eureka Roadhouse, Alaska
  5. 1.8 37 km SSE of Nelchina, Alaska
  6. 1.6 20 km ESE of Glacier View, Alaska
  7. 1.6 25 km S of Nelchina, Alaska
  8. 1.8 30 km SE of Glacier View, Alaska
  9. 1.6 25 km S of Eureka Roadhouse, Alaska
  10. 1.6 31 km NW of Eureka Roadhouse, Alaska
  11. 2.2 36 km SSE of Eureka Roadhouse, Alaska
  12. 2.0 15 km S of Eureka Roadhouse, Alaska
  13. 1.7 9 km W of Mendeltna, Alaska
  14. 1.6 30 km NW of Eureka Roadhouse, Alaska
  15. 1.6 19 km WNW of Eureka Roadhouse, 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 4.8 on 2022-10-06 — it released about 180 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.