QuakeIndex

Earthquake · reviewed by a seismologist

M 4.5mwr

1 km E of Homer, Alaska

· 48 km deep · released about 85 tons of TNT

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10 km30 km60 km120 km N Kenai Peninsula Borough 92 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 4.5 (mwr)
Depth
48 km below the surface
Felt
251 reports · strongest reported intensity VI
Measured shaking
intensity IV (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Kenai Peninsula Borough, 92 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 440 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 251 people have reported feeling it to USGS.

How big was it?

This earthquake released about 85 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 2,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 89× the energy of this one
  3. Magna, Utah 2020 M 5.7 63× the energy of this one
  4. This earthquake M 4.5 about 85 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 180× more

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 59.6425, -151.5216. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kenai Peninsula Borough, AK 92 km (57 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. 1.9 14 km W of Fox River, Alaska
  2. 1.8 8 km N of Anchor Point, Alaska
  3. 1.6 10 km E of Ninilchik, Alaska
  4. 2.0 4 km NNE of Anchor Point, Alaska
  5. 2.0 4 km SE of Homer, Alaska
  6. 1.7 4 km NNW of Anchor Point, Alaska
  7. 1.9 5 km ESE of Happy Valley, Alaska
  8. 2.0 3 km W of Diamond Ridge, Alaska
  9. 1.5 7 km N of Nikolaevsk, Alaska
  10. 1.7 6 km ESE of Happy Valley, Alaska
  11. 2.9 5 km SW of Anchor Point, Alaska
  12. 1.9 8 km WSW of Anchor Point, Alaska
  13. 1.6 2 km W of Happy Valley, Alaska
  14. 1.7 31 km ESE of Port Graham, Alaska
  15. 1.6 7 km WNW of Happy Valley, 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 22 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.