QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

37 km WSW of Cantwell, Alaska

· 90 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Denali Borough 46 kmMatanuska-Susitna Borough 115 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 1.8 (ml)
Depth
90 km below the surface
Felt
no reports yet
Nearest
Denali Borough, 46 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1150 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 63.3001, -149.6730. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Denali Borough, AK 46 km (29 mi) SSE of here earthquakes near Denali Borough
Matanuska-Susitna Borough, AK 115 km (72 mi) N of here earthquakes near Matanuska-Susitna 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. 1.6 54 km WSW of Cantwell, Alaska
  2. 1.7 43 km SW of Cantwell, Alaska
  3. 2.7 55 km NNE of Chase, Alaska
  4. 1.8 39 km SW of Cantwell, Alaska
  5. 1.6 Central Alaska
  6. 1.6 52 km NNE of Chase, Alaska
  7. 1.5 50 km NNE of Chase, Alaska
  8. 1.9 34 km W of Cantwell, Alaska
  9. 1.6 57 km SSW of Cantwell, Alaska
  10. 1.5 44 km SSW of Cantwell, Alaska
  11. 1.7 54 km SSW of Cantwell, Alaska
  12. 2.2 47 km SW of Cantwell, Alaska
  13. 2.0 31 km SW of Cantwell, Alaska
  14. 1.7 69 km WSW of Cantwell, Alaska
  15. 1.5 47 km SW of Cantwell, 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.