QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

18 km SW of Old Harbor, Alaska

· 22 km deep · released about 7.6 lb of TNT

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10 km30 km60 km120 km N Kodiak Island Borough 70 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 1.6 (ml)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Kodiak Island Borough, 70 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1748 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 7.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 57.1060, -153.5522. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kodiak Island Borough, AK 70 km (44 mi) SSE 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

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

  1. 1.7 34 km N of Old Harbor, Alaska
  2. 1.9 36 km SSE of Old Harbor, Alaska
  3. 1.5 25 km SE of Larsen Bay, Alaska
  4. 1.7 16 km NE of Old Harbor, Alaska
  5. 2.0 12 km S of Old Harbor, Alaska
  6. 2.3 13 km ESE of Larsen Bay, Alaska
  7. 2.3 5 km SW of Old Harbor, Alaska
  8. 1.9 21 km NNE of Old Harbor, Alaska
  9. 2.1 Kodiak Island region, Alaska
  10. 1.9 26 km WNW of Old Harbor, Alaska
  11. 1.7 27 km NE of Akhiok, Alaska
  12. 2.5 28 km NE of Akhiok, Alaska
  13. 2.4 Kodiak Island region, Alaska
  14. 1.9 34 km SSE of Old Harbor, Alaska
  15. 2.5 30 km SSE 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.