QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

25 km N of Girdwood, Alaska

· 18 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 7 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 3.2 (ml)
Depth
18 km below the surface
Felt
108 reports · strongest reported intensity V
Measured shaking
intensity III (ShakeMap)
Nearest
Anchorage Municipality, 7 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 605 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 108 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× 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 61.1749, -149.1607. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 7 km (4 mi) E of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 2.7 0 km ENE of Gateway, Alaska
  2. 1.7 7 km SSE of Knik, Alaska
  3. 2.5 7 km SSE of Knik, Alaska
  4. 1.6 15 km N of Girdwood, Alaska
  5. 2.0 10 km ESE of Eagle River, Alaska
  6. 1.9 14 km ESE of Eagle River, Alaska
  7. 1.5 16 km NE of Girdwood, Alaska
  8. 1.6 3 km SW of Hope, Alaska
  9. 2.3 22 km SSE of Knik River, Alaska
  10. 2.2 23 km ENE of Girdwood, Alaska
  11. 2.8 12 km SSE of Elmendorf Air Force Base, Alaska
  12. 1.7 16 km ESE of Eagle River, Alaska
  13. 2.1 4 km ESE of Knik, Alaska
  14. 1.8 17 km W of Whittier, Alaska
  15. 1.7 13 km SE of Knik-Fairview, 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 2023-07-03 — it released about 89 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.