QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

72 km S of False Pass, Alaska

Yes. A magnitude 2.1 earthquake was recorded 72 km S of False Pass, Alaska, at 11:05 am AKDT on 24 October 2022 (19:05 UTC), 77 km deep.

· 77 km deep · released about 43 lb of TNT

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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 2.1 (ml)
Depth
77 km below the surface
Felt
no reports yet
Nearest
Aleutians East Borough, 154 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1464 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 4.9 on 2020-05-09 — about 16,000 times the energy of this one.

Before 2016, the USGS record lists 20 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.5 79 km SW of False Pass, Alaska · 37 km WNW of this epicentre
  2. 6.2 102 km SSW of False Pass, Alaska · 35 km SW of this epicentre
  3. 6.0 106 km ESE of Akutan, Alaska · 49 km SW of this epicentre
  4. 6.0 96 km SSW of False Pass, Alaska · 25 km SSW of this epicentre
  5. 5.8 95 km E of Akutan, 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 54.2165, -163.6130. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Aleutians East Borough, AK 154 km (96 mi) NE earthquakes near Aleutians East Borough

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

Aftershocks so far

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

  1. 2.1 90 km S of False Pass, Alaska
  2. 1.7 48 km S of False Pass, Alaska
  3. 2.2 Unimak Island region, Alaska
  4. 2.2 101 km S of False Pass, Alaska
  5. 2.2 70 km SSW of False Pass, Alaska
  6. 2.7 110 km SSW of False Pass, Alaska
  7. 2.6 120 km SSW of False Pass, Alaska
  8. 2.6 88 km S of False Pass, Alaska
  9. 2.3 109 km S of False Pass, Alaska
  10. 2.3 Unimak Island region, Alaska
  11. 2.3 114 km SSW of False Pass, Alaska
  12. 2.6 106 km S of False Pass, Alaska
  13. 3.2 Unimak Island region, Alaska
  14. 1.5 44 km SSW of False Pass, Alaska
  15. 2.6 112 km SSW 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.