QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

87 km SSE of Kokhanok, Alaska

· 10 km deep · released about 680 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kodiak Island Borough 112 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 2.9 (ml)
Depth
10 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Kodiak Island Borough, 112 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1788 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 680 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 22,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.4× the energy of this one
  4. This earthquake M 2.9 about 680 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 58.6831, -154.3943. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 112 km (70 mi) NNW of here earthquakes near Kodiak Island Borough
Lake and Peninsula Borough, AK 134 km (83 mi) ENE 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

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

  1. 1.9 63 km SSE of Kokhanok, Alaska
  2. 2.8 Alaska Peninsula
  3. 1.6 89 km WNW of Aleneva, Alaska
  4. 1.9 73 km SSE of Kokhanok, Alaska
  5. 1.7 88 km NW of Aleneva, Alaska
  6. 1.8 86 km NNW of Karluk, Alaska
  7. 1.6 64 km S of Kokhanok, Alaska
  8. 3.1 100 km N of Karluk, Alaska
  9. 1.6 89 km NNW of Karluk, Alaska
  10. 1.6 79 km NW of Aleneva, Alaska
  11. 1.6 60 km SE of Kokhanok, Alaska
  12. 1.6 65 km WNW of Aleneva, Alaska
  13. 2.3 60 km SSE of Kokhanok, Alaska
  14. 2.1 Alaska Peninsula
  15. 1.6 79 km S of Kokhanok, 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 4.5 on 2020-02-12 — it released about 250 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.