QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

27 km SW of Old Harbor, Alaska

· 35 km deep · released about 340 lb of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 78 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 2.7 (ml)
Depth
35 km below the surface
Felt
no reports yet
Nearest
Kodiak Island Borough, 78 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2346 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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 57.0262, -153.6138. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 78 km (48 mi) SSE 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

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

  1. 3.6 Kodiak Island region, Alaska
  2. 2.5 20 km ENE of Akhiok, Alaska
  3. 1.5 32 km W of Old Harbor, Alaska
  4. 1.8 20 km NNE of Old Harbor, Alaska
  5. 1.6 32 km NNE of Akhiok, Alaska
  6. 1.6 18 km SW of Old Harbor, Alaska
  7. 1.5 16 km NNE of Akhiok, Alaska
  8. 2.1 27 km E of Akhiok, Alaska
  9. 2.0 26 km ESE of Akhiok, Alaska
  10. 1.5 29 km WSW of Old Harbor, Alaska
  11. 1.9 20 km ESE of Akhiok, Alaska
  12. 2.0 35 km SSE of Akhiok, Alaska
  13. 1.8 31 km E of Akhiok, Alaska
  14. 1.9 25 km SE of Larsen Bay, Alaska
  15. 1.8 Kodiak Island region, 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.