QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

21 km SSW of Whittier, Alaska

· 29 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 66 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 3.3 (ml)
Depth
29 km below the surface
Felt
19 reports · strongest reported intensity III
Nearest
Anchorage Municipality, 66 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1146 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 19 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 60.6130, -148.9005. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 66 km (41 mi) SSE of here earthquakes near Anchorage Municipality

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

Aftershocks so far

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

  1. 1.8 20 km N of Whittier, Alaska
  2. 1.6 21 km N of Moose Pass, Alaska
  3. 1.7 18 km N of Moose Pass, Alaska
  4. 1.6 34 km NW of Chenega, Alaska
  5. 1.9 21 km ENE of Girdwood, Alaska
  6. 1.6 10 km SSE of Girdwood, Alaska
  7. 2.9 17 km NNE of Whittier, Alaska
  8. 2.4 28 km SSW of Whittier, Alaska
  9. 1.6 17 km SE of Sunrise, Alaska
  10. 1.5 18 km E of Crown Point, Alaska
  11. 1.7 26 km SSW of Whittier, Alaska
  12. 2.7 23 km ENE of Girdwood, Alaska
  13. 1.6 16 km ESE of Girdwood, Alaska
  14. 2.2 15 km ESE of Girdwood, Alaska
  15. 2.4 10 km S of Girdwood, 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.

On USGS

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