QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

32 km SSW of Tonsina, Alaska

· 20 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Copper River Census Area 105 kmChugach Census Area 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 2.9 (ml)
Depth
20 km below the surface
Felt
no reports yet
Nearest
Copper River Census Area, 105 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1143 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 61.3845, -145.3766. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Copper River Census Area, AK 105 km (65 mi) SW of here earthquakes near Copper River Census Area
Chugach Census Area, AK 109 km (68 mi) NNE 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. 1.8 54 km S of Tonsina, Alaska
  2. 1.8 45 km SW of Chitina, Alaska
  3. 1.5 28 km ENE of Valdez, Alaska
  4. 3.5 46 km ESE of Valdez, Alaska
  5. 1.6 47 km SSW of Tonsina, Alaska
  6. 1.9 56 km ESE of Valdez, Alaska
  7. 1.5 36 km WSW of Tonsina, Alaska
  8. 1.5 Southern Alaska
  9. 2.1 29 km SSE of Tonsina, Alaska
  10. 1.9 42 km E of Valdez, Alaska
  11. 1.8 36 km E of Valdez, Alaska
  12. 1.6 10 km SSE of Kenny Lake, Alaska
  13. 1.6 42 km ENE of Valdez, Alaska
  14. 4.8 Southern Alaska
  15. 1.9 30 km ESE of Valdez, 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.