QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

15 km WNW of Seldovia Village, Alaska

· 47 km deep · released about 15 lb of TNT

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10 km30 km60 km120 km N Kenai Peninsula Borough 94 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 1.8 (ml)
Depth
47 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 94 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 223 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 59.5440, -151.9020. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 94 km (59 mi) SSE 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

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

  1. 1.6 20 km SW of Anchor Point, Alaska
  2. 2.7 1 km SSW of Happy Valley, Alaska
  3. 2.0 6 km NNW of Seldovia Village, Alaska
  4. 1.7 30 km WNW of Anchor Point, Alaska
  5. 2.3 3 km SE of Nikolaevsk, Alaska
  6. 1.9 20 km WSW of Anchor Point, Alaska
  7. 2.5 6 km NW of Nanwalek, Alaska
  8. 1.9 5 km ENE of Anchor Point, Alaska
  9. 2.0 20 km SW of Anchor Point, Alaska
  10. 2.1 0 km WSW of Kachemak City, Alaska
  11. 1.6 21 km W of Anchor Point, Alaska
  12. 2.8 25 km SW of Anchor Point, Alaska
  13. 1.7 35 km NW of Nanwalek, Alaska
  14. 1.8 23 km W of Happy Valley, Alaska
  15. 2.1 6 km NE of Nikolaevsk, 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 5.4 on 2023-03-19 — it released about 250,000 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.