QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

105 km WNW of False Pass, Alaska

Yes. A magnitude 2.7 earthquake was recorded 105 km WNW of False Pass, Alaska, at 9:14 pm AKST on 11 January 2022 (06:14 UTC), 179 km deep.

· 179 km deep · released about 340 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 2.7 (ml)
Depth
179 km below the surface
Felt
no reports yet
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1701 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 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 340 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 45,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 32,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.8× the energy of this one
  4. This earthquake M 2.7 about 340 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

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

Before 2016, the USGS record lists one earthquake of M5 or more within 50 km:

  1. 5.3 133 km NW of False Pass, Alaska · 41 km NNW 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 55.2592, -164.9001. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.4 98 km W of False Pass, Alaska
  2. 2.7 103 km W of False Pass, Alaska
  3. 4.1 95 km WNW of False Pass, Alaska
  4. 2.1 91 km NNE of Akutan, Alaska
  5. 2.0 94 km NNE of Akutan, Alaska
  6. 2.1 109 km NNE of Akutan, Alaska
  7. 2.6 117 km NW of False Pass, Alaska
  8. 2.8 100 km NNE of Akutan, Alaska
  9. 2.6 91 km W of False Pass, Alaska
  10. 4.1 130 km WNW of False Pass, Alaska
  11. 2.8 79 km WNW of False Pass, Alaska
  12. 3.4 106 km W of False Pass, Alaska
  13. 2.6 86 km W of False Pass, Alaska
  14. 3.3 Unimak Island region, Alaska
  15. 2.2 130 km WNW 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.