QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

75 km ENE of Ugashik, Alaska

· 9.1 km deep · released about 120 lb of TNT

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10 km30 km60 km120 km N Lake and Peninsula Borough 50 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 2.4 (ml)
Depth
9.1 km below the surface
Felt
no reports yet
Nearest
Lake and Peninsula Borough, 50 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2311 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 130,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 89,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.9× the energy of this one
  4. This earthquake M 2.4 about 120 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 57.6786, -156.1803. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake and Peninsula Borough, AK 50 km (31 mi) SSE of here earthquakes near Lake and Peninsula Borough
Bristol Bay Borough, AK 126 km (78 mi) SSE of here earthquakes near Bristol Bay Borough

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

Aftershocks so far

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

  1. 2.1 57 km ENE of Ugashik, Alaska
  2. 1.6 73 km ENE of Ugashik, Alaska
  3. 1.8 77 km ENE of Ugashik, Alaska
  4. 2.6 61 km ENE of Ugashik, Alaska
  5. 1.6 62 km SE of Egegik, Alaska
  6. 1.7 57 km ESE of Egegik, Alaska
  7. 1.5 74 km ENE of Ugashik, Alaska
  8. 1.6 85 km ESE of Ugashik, Alaska
  9. 1.7 73 km W of Karluk, Alaska
  10. 2.0 47 km ENE of Ugashik, Alaska
  11. 1.9 65 km ESE of Ugashik, Alaska
  12. 1.6 76 km ESE of Egegik, Alaska
  13. 2.0 72 km W of Karluk, Alaska
  14. 2.0 82 km ESE of Egegik, Alaska
  15. 1.7 74 km ESE of Egegik, 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 4.9 on 2020-02-17 — it released about 5,600 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.