QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1ml

20 km S of King Salmon, Alaska

· 201 km deep · released about 21 tons of TNT

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10 km30 km60 km120 km N Bristol Bay Borough 30 kmLake and Peninsula Borough 47 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 4.1 (ml)
Depth
201 km below the surface
Felt
no reports yet
Nearest
Bristol Bay Borough, 30 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1153 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

How big was it?

This earthquake released about 21 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,900× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 350× the energy of this one
  3. Magna, Utah 2020 M 5.7 250× the energy of this one
  4. This earthquake M 4.1 about 21 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 45× 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 58.5017, -156.7095. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bristol Bay Borough, AK 30 km (19 mi) SSE of here earthquakes near Bristol Bay Borough
Lake and Peninsula Borough, AK 47 km (29 mi) NNW of here earthquakes near Lake and Peninsula Borough
Dillingham Census Area, AK 146 km (91 mi) SE of here earthquakes near Dillingham Census Area

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

Aftershocks so far

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

  1. 2.6 40 km SSE of King Salmon, Alaska
  2. 2.2 53 km E of Egegik, Alaska
  3. 2.6 Alaska Peninsula
  4. 3.2 22 km SSE of King Salmon, Alaska
  5. 2.3 22 km SE of King Salmon, Alaska
  6. 2.5 30 km ESE of King Salmon, Alaska
  7. 2.9 14 km SSE of King Salmon, Alaska
  8. 2.3 52 km E of Egegik, Alaska
  9. 2.8 54 km SSE of King Salmon, Alaska
  10. 1.7 38 km SE of King Salmon, Alaska
  11. 3.8 35 km S of King Salmon, Alaska
  12. 3.5 48 km SSE of King Salmon, Alaska
  13. 1.6 62 km SSE of King Salmon, Alaska
  14. 1.8 16 km NW of Naknek, Alaska
  15. 2.0 Alaska Peninsula

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.