QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

33 km SE of Chickaloon, Alaska

· 20 km deep · released about 1.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Anchorage Municipality 78 kmMatanuska-Susitna Borough 109 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
20 km below the surface
Felt
5 reports · strongest reported intensity III
Nearest
Anchorage Municipality, 78 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1147 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 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 61.5611, -148.0652. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Anchorage Municipality, AK 78 km (48 mi) NE of here earthquakes near Anchorage Municipality
Matanuska-Susitna Borough, AK 109 km (68 mi) SE of here earthquakes near Matanuska-Susitna Borough
Chugach Census Area, AK 156 km (97 mi) NW of here earthquakes near Chugach Census Area

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

Aftershocks so far

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

  1. 2.1 12 km ESE of Chickaloon, Alaska
  2. 2.2 51 km S of Glacier View, Alaska
  3. 2.9 18 km ESE of Chickaloon, Alaska
  4. 1.8 15 km ESE of Chickaloon, Alaska
  5. 1.5 43 km E of Knik River, Alaska
  6. 1.7 27 km SSW of Glacier View, Alaska
  7. 1.5 64 km S of Glacier View, Alaska
  8. 1.5 13 km SSW of Chickaloon, Alaska
  9. 1.9 65 km ESE of Knik River, Alaska
  10. 1.6 63 km S of Glacier View, Alaska
  11. 1.9 15 km SSE of Glacier View, Alaska
  12. 1.9 19 km ESE of Chickaloon, Alaska
  13. 1.9 15 km ESE of Chickaloon, Alaska
  14. 4.1 15 km WNW of Glacier View, Alaska
  15. 1.8 15 km SE of Chickaloon, 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 4.1 on 2016-11-06 — it released about 16 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.