QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

87 km SE of Ugashik, Alaska

· 3.6 km deep · released about 7.6 lb of TNT

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10 km30 km60 km120 km N Lake and Peninsula Borough 118 km
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
3.6 km below the surface
Felt
no reports yet
Nearest
Lake and Peninsula Borough, 118 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1273 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

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.

Where

Epicentre 57.0504, -156.2259. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake and Peninsula Borough, AK 118 km (73 mi) S of here earthquakes near Lake and Peninsula Borough

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

Aftershocks so far

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

  1. 1.9 77 km ESE of Ugashik, Alaska
  2. 2.5 107 km W of Akhiok, Alaska
  3. 1.6 113 km SE of Ugashik, Alaska
  4. 1.7 100 km SSE of Ugashik, Alaska
  5. 2.7 121 km SE of Ugashik, Alaska
  6. 1.8 73 km ESE of Ugashik, Alaska
  7. 2.0 95 km WSW of Karluk, Alaska
  8. 2.4 88 km ESE of Ugashik, Alaska
  9. 2.1 104 km ESE of Ugashik, Alaska
  10. 3.5 102 km ESE of Ugashik, Alaska
  11. 2.2 103 km W of Akhiok, Alaska
  12. 2.2 Alaska Peninsula
  13. 4.5 105 km ESE of Ugashik, Alaska
  14. 3.1 88 km ESE of Ugashik, Alaska
  15. 1.9 50 km E of Ugashik, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2022-04-10 — it released about 32,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.