QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mw

41 km S of Chiniak, Alaska

· 38 km deep · released about 21 tons of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 107 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 (mw)
Depth
38 km below the surface
Felt
11 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kodiak Island Borough, 107 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1150 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 11 people have reported feeling it to USGS.

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 57.2393, -152.3602. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 107 km (66 mi) ESE of here earthquakes near Kodiak Island Borough

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

Aftershocks so far

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

  1. 2.2 19 km S of Womens Bay, Alaska
  2. 1.9 35 km S of Chiniak, Alaska
  3. 2.4 Kodiak Island region, Alaska
  4. 2.1 7 km SSE of Womens Bay, Alaska
  5. 2.0 7 km NW of Chiniak, Alaska
  6. 1.6 48 km SE of Old Harbor, Alaska
  7. 3.0 15 km S of Womens Bay, Alaska
  8. 2.8 18 km ESE of Chiniak, Alaska
  9. 2.5 8 km SE of Womens Bay, Alaska
  10. 1.6 16 km ESE of Chiniak, Alaska
  11. 1.7 18 km SSW of Womens Bay, Alaska
  12. 2.1 18 km S of Womens Bay, Alaska
  13. 1.9 18 km SW of Chiniak, Alaska
  14. 1.5 Kodiak Island region, Alaska
  15. 1.8 34 km E of Old Harbor, 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.

On USGS

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