QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

36 km NNE of Petersville, Alaska

· 89 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Matanuska-Susitna Borough 82 kmDenali Borough 100 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 2.1 (ml)
Depth
89 km below the surface
Felt
no reports yet
Nearest
Matanuska-Susitna Borough, 82 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1153 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 lb of TNT

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 62.8155, -150.5825. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Matanuska-Susitna Borough, AK 82 km (51 mi) NW of here earthquakes near Matanuska-Susitna Borough
Denali Borough, AK 100 km (62 mi) SSW of here earthquakes near Denali Borough

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. 2.4 63 km SE of Denali National Park, Alaska
  2. 1.5 66 km NNE of Petersville, Alaska
  3. 1.8 63 km SE of Denali National Park, Alaska
  4. 1.5 64 km SE of Denali National Park, Alaska
  5. 1.6 51 km N of Petersville, Alaska
  6. 1.6 57 km N of Chase, Alaska
  7. 2.2 55 km N of Chase, Alaska
  8. 3.0 Central Alaska
  9. 2.4 17 km NW of Petersville, Alaska
  10. 1.8 71 km WSW of Cantwell, Alaska
  11. 1.6 76 km WSW of Cantwell, Alaska
  12. 1.7 50 km N of Petersville, Alaska
  13. 2.1 60 km NNE of Petersville, Alaska
  14. 1.6 Central Alaska
  15. 1.5 64 km N of Petersville, 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.