QuakeIndex

Earthquake · reviewed by a seismologist

M 3.8mb

36 km NNE of False Pass, Alaska

· 189 km deep · released about 7.6 tons of TNT

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10 km30 km60 km120 km N Aleutians East Borough 83 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 3.8 (mb)
Depth
189 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 83 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 243 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 7.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.8 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 22,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 710× the energy of this one
  4. This earthquake M 3.8 about 7.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 16× more

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 55.1750, -163.2969. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Aleutians East Borough, AK 83 km (51 mi) W of here earthquakes near Aleutians East Borough

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

Aftershocks so far

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

  1. 2.5 22 km WNW of False Pass, Alaska
  2. 2.2 53 km NW of Cold Bay, Alaska
  3. 2.6 22 km SSW of Cold Bay, Alaska
  4. 2.8 22 km E of False Pass, Alaska
  5. 2.8 27 km SW of Cold Bay, Alaska
  6. 2.0 23 km ESE of False Pass, Alaska
  7. 2.0 15 km SE of False Pass, Alaska
  8. 2.8 21 km NNW of False Pass, Alaska
  9. 2.8 76 km WNW of Cold Bay, Alaska
  10. 2.6 28 km NNW of Cold Bay, Alaska
  11. 2.4 50 km NW of Cold Bay, Alaska
  12. 1.9 11 km W of Cold Bay, Alaska
  13. 2.4 25 km W of False Pass, Alaska
  14. 2.1 13 km SSW of Cold Bay, Alaska
  15. 2.0 17 km WNW of Cold 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2018-07-02 — it released about 16 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.