QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

71 km SE of Igiugig, Alaska

· 135 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Bristol Bay Borough 108 kmLake and Peninsula Borough 109 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
135 km below the surface
Felt
no reports yet
Nearest
Bristol Bay Borough, 108 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1144 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 58.8205, -155.1297. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Bristol Bay Borough, AK 108 km (67 mi) E of here earthquakes near Bristol Bay Borough
Lake and Peninsula Borough, AK 109 km (68 mi) NE 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

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

  1. 1.9 65 km ESE of King Salmon, Alaska
  2. 1.8 84 km SSE of Igiugig, Alaska
  3. 1.5 89 km ESE of King Salmon, Alaska
  4. 2.1 78 km SE of Igiugig, Alaska
  5. 1.6 82 km S of Kokhanok, Alaska
  6. 1.6 94 km S of Kokhanok, Alaska
  7. 1.5 90 km SSE of Igiugig, Alaska
  8. 1.5 87 km SSE of Igiugig, Alaska
  9. 1.7 101 km ESE of King Salmon, Alaska
  10. 1.9 64 km SE of Igiugig, Alaska
  11. 2.2 69 km S of Kokhanok, Alaska
  12. 3.3 76 km S of Kokhanok, Alaska
  13. 1.8 86 km E of King Salmon, Alaska
  14. 1.8 68 km S of Kokhanok, Alaska
  15. 2.5 71 km ESE of King Salmon, 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.