QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

2 km W of Nikolaevsk, Alaska

· 72 km deep · released about 480 lb of TNT

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10 km30 km60 km120 km N Kenai Peninsula Borough 72 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 2.8 (ml)
Depth
72 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 72 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1993 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

How big was it?

This earthquake released about 480 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 59.8135, -151.6572. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 72 km (45 mi) SSE of here earthquakes near Kenai Peninsula Borough

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

Aftershocks so far

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

  1. 2.0 1 km ENE of Nikolaevsk, Alaska
  2. 1.5 25 km W of Happy Valley, Alaska
  3. 1.6 22 km ESE of Ninilchik, Alaska
  4. 1.7 14 km ESE of Ninilchik, Alaska
  5. 1.5 7 km N of Nanwalek, Alaska
  6. 1.6 13 km W of Clam Gulch, Alaska
  7. 1.5 6 km N of Anchor Point, Alaska
  8. 1.6 4 km ESE of Fritz Creek, Alaska
  9. 1.5 16 km E of Happy Valley, Alaska
  10. 1.5 1 km N of Seldovia, Alaska
  11. 1.5 12 km WNW of Fox River, Alaska
  12. 1.9 12 km WNW of Happy Valley, Alaska
  13. 2.6 24 km W of Happy Valley, Alaska
  14. 1.8 6 km SSW of Happy Valley, Alaska
  15. 1.6 4 km NNW of Happy Valley, 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 5.3 on 2017-05-07 — 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.