QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0ml

Fox Islands, Aleutian Islands, Alaska

Yes. A magnitude 2.0 earthquake was recorded in the Fox Islands, Aleutian Islands, Alaska, at 3:03 am AKDT on 10 October 2023 (11:03 UTC), 40 km deep.

· 40 km deep · released about 30 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 2.0 (ml)
Depth
40 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1113 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 30 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 350,000× the energy of this one
  3. Around the size people start to feel M 3.0 32× the energy of this one
  4. This earthquake M 2.0 about 30 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 6.8 on 2022-01-11 — about 16,000,000 times the energy of this one.

Before 2016, the USGS record lists 60 earthquakes of M5 or more within 50 km; the five largest:

  1. 7.8 81 km E of Nikolski, Alaska · 48 km NNW of this epicentre
  2. 7.0 Fox Islands, Aleutian Islands, Alaska · 33 km SSW of this epicentre
  3. 6.9 80 km E of Nikolski, Alaska · 45 km NW of this epicentre
  4. 6.7 103 km SE of Nikolski, Alaska · 38 km SW of this epicentre
  5. 6.7 72 km ESE of Nikolski, Alaska · 43 km W 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 52.6503, -167.2568. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 3.2 151 km ESE of Nikolski, Alaska
  2. 2.1 77 km ESE of Nikolski, Alaska
  3. 3.9 118 km E of Nikolski, Alaska
  4. 1.8 87 km E of Nikolski, Alaska
  5. 2.1 135 km ESE of Nikolski, Alaska
  6. 2.7 143 km ESE of Nikolski, Alaska
  7. 2.9 147 km ESE of Nikolski, Alaska
  8. 2.9 143 km ESE of Nikolski, Alaska
  9. 3.3 151 km ESE of Nikolski, Alaska
  10. 2.8 146 km ESE of Nikolski, Alaska
  11. 2.2 140 km ESE of Nikolski, Alaska
  12. 3.0 94 km E of Nikolski, Alaska
  13. 2.7 135 km ESE of Nikolski, Alaska
  14. 3.1 128 km ESE of Nikolski, Alaska
  15. 2.2 131 km ESE of Nikolski, 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.