QuakeIndex

Earthquake · automatic estimate, may change

M 2.5ml

21 km NE of Chiniak, Alaska

· 50 km deep · released about 170 lb of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 113 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 2.5 (ml)
Depth
50 km below the surface
Felt
no reports yet
Nearest
Kodiak Island Borough, 113 km W
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 295 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 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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 57.7416, -152.0121. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 113 km (70 mi) E of here earthquakes near Kodiak Island Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.4 12 km ESE of Kodiak, Alaska
  2. 2.1 50 km ENE of Kodiak, Alaska
  3. 2.1 34 km NE of Ouzinkie, Alaska
  4. 2.2 29 km ESE of Chiniak, Alaska
  5. 2.1 17 km SSE of Chiniak, Alaska
  6. 3.0 8 km NNE of Kodiak Station, Alaska
  7. 1.8 49 km ENE of Ouzinkie, Alaska
  8. 2.7 22 km S of Chiniak, Alaska
  9. 1.9 34 km ENE of Ouzinkie, Alaska
  10. 2.3 0 km ESE of Ouzinkie, Alaska
  11. 2.4 17 km SW of Chiniak, Alaska
  12. 2.2 51 km ENE of Ouzinkie, Alaska
  13. 2.1 52 km ENE of Ouzinkie, Alaska
  14. 2.5 24 km E of Chiniak, Alaska
  15. 4.2 24 km SSW of Chiniak, 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.