QuakeIndex

Earthquake · automatic estimate, may change

M 2.2ml

26 km SSW of Tonsina, Alaska

· 1.1 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Copper River Census Area 100 kmChugach Census Area 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 2.2 (ml)
Depth
1.1 km below the surface
Felt
no reports yet
Nearest
Copper River Census Area, 100 km NE
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 2666 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 61.4323, -145.3353. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Copper River Census Area, AK 100 km (62 mi) SW of here earthquakes near Copper River Census Area
Chugach Census Area, AK 115 km (71 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

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

  1. 2.1 51 km S of Tonsina, Alaska
  2. 1.8 36 km WSW of Tonsina, Alaska
  3. 2.2 39 km NE of Valdez, Alaska
  4. 2.1 33 km WSW of Chitina, Alaska
  5. 1.7 47 km SSW of Tonsina, Alaska
  6. 2.2 37 km SSW of Tonsina, Alaska
  7. 2.3 40 km ENE of Valdez, Alaska
  8. 2.2 40 km NE of Valdez, Alaska
  9. 1.5 61 km SW of Chitina, Alaska
  10. 2.5 58 km SW of Chitina, Alaska
  11. 2.0 21 km W of Chitina, Alaska
  12. 1.7 48 km SW of Chitina, Alaska
  13. 2.1 42 km ENE of Valdez, Alaska
  14. 1.8 37 km ESE of Valdez, Alaska
  15. 1.6 32 km NE 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.