QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

32 km SW of Karluk, Alaska

· 10 km deep · released about 21 lb of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 66 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 1.9 (ml)
Depth
10 km below the surface
Felt
no reports yet
Nearest
Kodiak Island Borough, 66 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 88 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 57.3290, -154.7740. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 66 km (41 mi) SW of here earthquakes near Kodiak Island Borough
Lake and Peninsula Borough, AK 130 km (81 mi) SE 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

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

  1. 1.5 62 km WNW of Akhiok, Alaska
  2. 2.7 47 km WSW of Karluk, Alaska
  3. 1.7 39 km W of Karluk, Alaska
  4. 2.2 39 km WSW of Karluk, Alaska
  5. 1.9 26 km SW of Karluk, Alaska
  6. 1.9 7 km NE of Karluk, Alaska
  7. 2.2 25 km NNW of Akhiok, Alaska
  8. 1.9 33 km SSW of Karluk, Alaska
  9. 3.6 32 km SW of Karluk, Alaska
  10. 2.2 20 km W of Akhiok, Alaska
  11. 1.7 51 km W of Karluk, Alaska
  12. 2.7 36 km NW of Akhiok, Alaska
  13. 1.9 19 km NNW of Akhiok, Alaska
  14. 1.8 21 km WSW of Karluk, Alaska
  15. 2.0 38 km WNW of Akhiok, 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 2021-02-13 — it released about 130,000 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.