QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

102 km ESE of Ugashik, Alaska

Yes. A magnitude 1.6 earthquake was recorded 102 km ESE of Ugashik, Alaska at 21:41 UTC on 2022-01-08, 19 km deep.

· 19 km deep · released about 7.6 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 1.6 (ml)
Depth
19 km below the surface
Felt
no reports yet
Nearest
Lake and Peninsula Borough, 122 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1744 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 4.3 on 2018-07-01 — about 11,000 times the energy of this one.

Before 2016, the USGS record lists 4 earthquakes of M5 or more within 50 km:

  1. 5.5 64 km SW of Karluk, Alaska · 43 km ENE of this epicentre
  2. 5.3 74 km WSW of Akhiok, Alaska · 47 km SE of this epicentre
  3. 5.0 113 km SE of Ugashik, Alaska · 36 km SSW of this epicentre
  4. 5.0 96 km SE of Ugashik, 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 57.0388, -155.9356. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Lake and Peninsula Borough, AK 122 km (76 mi) NNW earthquakes near Lake and Peninsula Borough

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

Aftershocks so far

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

  1. 1.8 81 km W of Akhiok, Alaska
  2. 1.6 107 km W of Akhiok, Alaska
  3. 1.6 90 km W of Akhiok, Alaska
  4. 2.0 71 km E of Ugashik, Alaska
  5. 1.5 97 km WSW of Akhiok, Alaska
  6. 1.5 95 km WSW of Akhiok, Alaska
  7. 2.0 99 km W of Akhiok, Alaska
  8. 1.8 102 km W of Akhiok, Alaska
  9. 2.0 95 km SE of Ugashik, Alaska
  10. 1.7 99 km SE of Ugashik, Alaska
  11. 1.8 104 km SE of Ugashik, Alaska
  12. 2.0 Alaska Peninsula
  13. 1.7 74 km ESE of Ugashik, Alaska
  14. 2.0 106 km SE of Ugashik, Alaska
  15. 1.5 86 km WSW of Karluk, 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.