QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

25 km NW of False Pass, Alaska

Yes. A magnitude 3.2 earthquake was recorded 25 km NW of False Pass, Alaska, at 5:56 am AKDT on 6 June 2021 (13:56 UTC), 22 km deep.

· 22 km deep · released about 1,900 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Aleutians East Borough 109 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 3.2 (ml)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 109 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1907 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 42 km (26 mi) from the epicentre. 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 1,900 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 180,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,600× the energy of this one
  4. This earthquake M 3.2 about 1,900 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 2× 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 5.9 27 km W of False Pass, Alaska · 20 km SSW of this epicentre
  2. 5.9 14 km NNE of False Pass, Alaska · 23 km ESE of this epicentre
  3. 5.5 66 km NNW of False Pass, Alaska · 43 km NNW of this epicentre
  4. 5.1 52 km W of False Pass, Alaska · 41 km WSW of this epicentre
  5. 5.0 29 km W of False Pass, Alaska · 23 km SW 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 55.0239, -163.6718. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aleutians East Borough, AK 109 km (68 mi) ENE earthquakes near Aleutians East Borough

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

Aftershocks so far

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

  1. 1.5 19 km S of False Pass, Alaska
  2. 1.7 26 km S of False Pass, Alaska
  3. 1.9 25 km S of False Pass, Alaska
  4. 1.9 26 km S of False Pass, Alaska
  5. 1.7 25 km SSE of False Pass, Alaska
  6. 2.8 46 km W of False Pass, Alaska
  7. 3.4 24 km S of False Pass, Alaska
  8. 2.5 25 km S of False Pass, Alaska
  9. 3.3 45 km W of False Pass, Alaska
  10. 2.7 26 km WNW of False Pass, Alaska
  11. 1.6 22 km S of False Pass, Alaska
  12. 1.9 24 km SSE of False Pass, Alaska
  13. 3.0 21 km SE of False Pass, Alaska
  14. 3.6 23 km S of False Pass, Alaska
  15. 1.9 19 km S of False Pass, 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.