QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

40 km SSW of Tonsina, Alaska

· 21 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Chugach Census Area 100 kmCopper River Census Area 114 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 1.6 (ml)
Depth
21 km below the surface
Felt
no reports yet
Nearest
Chugach Census Area, 100 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2567 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 61.3127, -145.4518. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Chugach Census Area, AK 100 km (62 mi) NNE of here earthquakes near Chugach Census Area
Copper River Census Area, AK 114 km (71 mi) SW of here earthquakes near Copper River Census Area

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. 2.1 42 km ENE of Valdez, Alaska
  2. 1.7 43 km NNE of Cordova, Alaska
  3. 1.8 37 km ESE of Valdez, Alaska
  4. 1.6 32 km NE of Valdez, Alaska
  5. 1.5 28 km NE of Valdez, Alaska
  6. 1.7 28 km NE of Valdez, Alaska
  7. 2.9 56 km E of Valdez, Alaska
  8. 1.6 62 km NNE of Cordova, Alaska
  9. 1.8 54 km S of Tonsina, Alaska
  10. 1.8 45 km SW of Chitina, Alaska
  11. 1.5 28 km ENE of Valdez, Alaska
  12. 3.5 46 km ESE of Valdez, Alaska
  13. 1.6 47 km SSW of Tonsina, Alaska
  14. 1.9 56 km ESE of Valdez, Alaska
  15. 1.5 36 km WSW of Tonsina, 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.