QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5ml

57 km S of Alcan Border, Alaska

Yes. A magnitude 2.5 earthquake was recorded 57 km S of Alcan Border, Alaska at 00:35 UTC on 2022-12-31, 1.3 km deep.

· 1.3 km deep · released about 170 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 2.5 (ml)
Depth
1.3 km below the surface
Felt
no reports yet
Nearest mapped fault
Denali fault, 7 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1347 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 22 km (14 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 170 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 89,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 63,000× the energy of this one
  3. Around the size people start to feel M 3.0 5.6× the energy of this one
  4. This earthquake M 2.5 about 170 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. 5.0 60 km SW of Alcan Border, Alaska · 29 km WNW 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 62.1608, -141.2766. Map © OpenStreetMap contributors.

Aftershocks so far

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

  1. 2.1 68 km S of Alcan Border, Alaska
  2. 2.3 59 km S of Alcan Border, Alaska
  3. 2.3 69 km S of Alcan Border, Alaska
  4. 2.4 65 km SSW of Alcan Border, Alaska
  5. 1.6 57 km SSW of Alcan Border, Alaska
  6. 1.8 52 km SSE of Alcan Border, Alaska
  7. 2.0 49 km SSW of Alcan Border, Alaska
  8. 1.9 55 km SSW of Alcan Border, Alaska
  9. 1.7 84 km S of Alcan Border, Alaska
  10. 1.7 66 km S of Alcan Border, Alaska
  11. 1.6 58 km S of Alcan Border, Alaska
  12. 1.8 91 km S of Alcan Border, Alaska
  13. 3.3 63 km S of Alcan Border, Alaska
  14. 1.7 46 km SW of Alcan Border, Alaska
  15. 1.6 74 km SSE of Alcan Border, 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.