QuakeIndex

Earthquake · reviewed by a seismologist

M 5.0mw

52 km SSW of Ugashik, Alaska

· 10 km deep · released about 480 tons 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 5.0 (mw)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity III
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Lake and Peninsula Borough, 138 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1151 days ago

This was a moderate earthquake. Shaking at this size can damage poorly built structures close to the epicentre. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 480 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 6.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 350× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 16× the energy of this one
  3. Magna, Utah 2020 M 5.7 11× the energy of this one
  4. This earthquake M 5.0 about 480 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 1,000× more

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 57.0687, -157.6624. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Lake and Peninsula Borough, AK 138 km (85 mi) SSW 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

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

  1. 2.0 58 km SSW of Ugashik, Alaska
  2. 1.8 56 km E of Port Heiden, Alaska
  3. 2.9 50 km SSW of Ugashik, Alaska
  4. 2.6 49 km SSW of Ugashik, Alaska
  5. 1.9 52 km E of Port Heiden, Alaska
  6. 2.1 57 km E of Port Heiden, Alaska
  7. 2.3 60 km SSW of Ugashik, Alaska
  8. 3.1 56 km E of Port Heiden, Alaska
  9. 2.4 41 km ENE of Port Heiden, Alaska
  10. 1.9 56 km E of Port Heiden, Alaska
  11. 2.8 49 km ENE of Port Heiden, Alaska
  12. 3.1 48 km ENE of Port Heiden, Alaska
  13. 3.7 50 km E of Port Heiden, Alaska
  14. 2.9 46 km S of Ugashik, Alaska
  15. 1.7 47 km S 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 6.2 on 2016-04-02 — it released about 63 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.