QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

107 km NE of Port Alsworth, Alaska

· 52 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 85 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
52 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 85 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1825 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 60.9965, -153.1992. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 85 km (53 mi) NW 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

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

  1. 1.6 85 km W of Tyonek, Alaska
  2. 1.6 88 km ENE of Port Alsworth, Alaska
  3. 2.4 91 km W of Tyonek, Alaska
  4. 1.8 81 km W of Nikiski, Alaska
  5. 1.7 78 km WNW of Nikiski, Alaska
  6. 1.9 82 km W of Salamatof, Alaska
  7. 1.9 88 km W of Nikiski, Alaska
  8. 1.7 87 km W of Salamatof, Alaska
  9. 1.6 79 km W of Nikiski, Alaska
  10. 1.9 74 km NE of Port Alsworth, Alaska
  11. 2.2 87 km ENE of Port Alsworth, Alaska
  12. 2.0 75 km NE of Port Alsworth, Alaska
  13. 2.1 85 km NE of Port Alsworth, Alaska
  14. 2.5 Southern Alaska
  15. 2.1 74 km W of Salamatof, 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.