QuakeIndex

Earthquake · automatic estimate, may change

M 3.0ml

27 km NNE of Old Harbor, Alaska

· 33 km deep · released about 950 lb of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 56 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 3.0 (ml)
Depth
33 km below the surface
Felt
no reports yet
Nearest
Kodiak Island Borough, 56 km WNW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 269 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 950 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 950 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 57.4338, -153.1285. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 56 km (35 mi) ESE 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

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

  1. 2.4 25 km S of Womens Bay, Alaska
  2. 2.2 5 km SE of Port Lions, Alaska
  3. 2.6 20 km WSW of Port Lions, Alaska
  4. 1.9 35 km NE of Larsen Bay, Alaska
  5. 1.8 14 km SSE of Womens Bay, Alaska
  6. 1.8 23 km WNW of Old Harbor, Alaska
  7. 2.8 4 km SE of Port Lions, Alaska
  8. 1.5 23 km NNW of Old Harbor, Alaska
  9. 2.1 34 km ENE of Larsen Bay, Alaska
  10. 2.1 37 km SW of Port Lions, Alaska
  11. 1.7 30 km N of Old Harbor, Alaska
  12. 2.4 35 km ESE of Old Harbor, Alaska
  13. 1.6 30 km WSW of Port Lions, Alaska
  14. 1.8 37 km E of Old Harbor, Alaska
  15. 1.8 11 km SE of Old Harbor, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.1 on 2017-11-09 — it released about 45 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.