QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

6 km NW of Old Harbor, Alaska

Yes. A magnitude 2.4 earthquake was recorded 6 km NW of Old Harbor, Alaska, at 8:19 am AKST on 25 January 2022 (17:19 UTC), 40 km deep.

· 40 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kodiak Island Borough 61 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 2.4 (ml)
Depth
40 km below the surface
Felt
no reports yet
Nearest
Kodiak Island Borough, 61 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1679 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

How big was it?

This earthquake released about 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.1 on 2017-11-09 — about 350 times the energy of this one.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 19 km SW of Old Harbor, Alaska · 20 km SSW of this epicentre
  2. 6.1 36 km ESE of Akhiok, Alaska · 47 km SSW of this epicentre
  3. 6.0 15 km S of Larsen Bay, Alaska · 43 km WNW of this epicentre
  4. 5.9 25 km E of Old Harbor, Alaska · 31 km ESE of this epicentre
  5. 5.9 14 km NNE of Akhiok, Alaska · 47 km WSW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 57.2393, -153.3812. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kodiak Island Borough, AK 61 km (38 mi) NNW earthquakes near Kodiak Island Borough

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

Aftershocks so far

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

  1. 2.1 32 km SSE of Old Harbor, Alaska
  2. 1.7 12 km NNE of Old Harbor, Alaska
  3. 1.6 17 km SSE of Larsen Bay, Alaska
  4. 1.9 33 km NE of Old Harbor, Alaska
  5. 1.6 16 km E of Larsen Bay, Alaska
  6. 2.9 33 km SW of Womens Bay, Alaska
  7. 3.1 45 km S of Old Harbor, Alaska
  8. 1.8 33 km SSE of Old Harbor, Alaska
  9. 2.1 Kodiak Island region, Alaska
  10. 1.7 34 km N of Old Harbor, Alaska
  11. 1.9 36 km SSE of Old Harbor, Alaska
  12. 1.5 25 km SE of Larsen Bay, Alaska
  13. 1.7 16 km NE of Old Harbor, Alaska
  14. 2.0 12 km S of Old Harbor, Alaska
  15. 2.3 13 km ESE of Larsen Bay, 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.