QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

70 km ENE of Ugashik, Alaska

· 128 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Lake and Peninsula Borough 31 kmBristol Bay Borough 106 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 1.9 (ml)
Depth
128 km below the surface
Felt
no reports yet
Nearest
Lake and Peninsula Borough, 31 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1059 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 57.8298, -156.3760. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake and Peninsula Borough, AK 31 km (19 mi) S of here earthquakes near Lake and Peninsula Borough
Bristol Bay Borough, AK 106 km (66 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

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

  1. 1.9 83 km ESE of Egegik, Alaska
  2. 2.4 75 km ESE of Egegik, Alaska
  3. 1.8 73 km ESE of Egegik, Alaska
  4. 1.7 90 km WNW of Karluk, Alaska
  5. 2.6 58 km ENE of Ugashik, Alaska
  6. 1.7 83 km ESE of Egegik, Alaska
  7. 2.0 58 km SE of Egegik, Alaska
  8. 1.9 53 km ENE of Ugashik, Alaska
  9. 2.1 86 km E of Ugashik, Alaska
  10. 1.5 85 km ESE of Egegik, Alaska
  11. 1.6 89 km WNW of Karluk, Alaska
  12. 1.8 90 km ENE of Ugashik, Alaska
  13. 1.9 90 km ENE of Ugashik, Alaska
  14. 1.6 51 km E of Ugashik, Alaska
  15. 1.6 74 km ENE 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 4.9 on 2020-02-17 — 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.