QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mwr

Earthquake near Homer, AK

No earthquake was likely felt in Homer in the 24 hours to 10:25 am AKST (19:25 UTC). The last one was M 4.3, 71 km (44 mi) NNE, at 2:30 am AKST on 1 November 2026, estimated intensity II (weak) in town; 115 felt reports to USGS. Every earthquake near Homer

This page: a magnitude 4.0 earthquake was recorded 31 km (20 mi) west-southwest of Homer, AK, at 1:10 am AKDT on 23 May 2022 (09:10 UTC), 55 km deep. 8 people have reported feeling it to USGS.

USGS: 18 km NNW of Nanwalek, Alaska

1:10 am AKDT, May 23, 2022 · · 55 km deep · released about 15 tons of TNT

Every earthquake near Homer Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kenai Peninsula Borough 96 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
1:10 am AKDT on 23 May 2022 ()
Where
31 km (20 mi) west-southwest of Homer, AK · earthquakes near Homer
Magnitude
M 4.0 (mwr)
Depth
55 km below the surface
Felt
8 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
Nearest
Kenai Peninsula Borough, 96 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1564 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon.

At this magnitude and depth, people at rest would likely notice it out to about 80 km (50 mi) from the epicentre. In Homer, 31 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Homer 31 km, intensity II · Anchor Point 32 km, intensity II · Diamond Ridge 33 km, intensity II · Fritz Creek 49 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 15 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 11,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 500× the energy of this one
  3. Magna, Utah 2020 M 5.7 350× the energy of this one
  4. This earthquake M 4.0 about 15 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 32× 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.6 on 2019-07-02 — about 7.9 times the energy of this one.

Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 25 km NW of Nanwalek, Alaska · 13 km W of this epicentre
  2. 5.9 Southern Alaska · 48 km W of this epicentre
  3. 5.5 6 km WNW of Nanwalek, Alaska · 16 km S of this epicentre
  4. 5.4 22 km ESE of Port Graham, Alaska · 42 km SE of this epicentre
  5. 5.4 41 km WNW of Nanwalek, Alaska · 33 km WSW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 59.5122, -152.0441. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 96 km (60 mi) N earthquakes near Kenai Peninsula Borough

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 20 km NW of Seldovia, Alaska
  2. 1.9 9 km SSW of Anchor Point, Alaska
  3. 1.5 Kenai Peninsula, Alaska
  4. 1.9 37 km WNW of Anchor Point, Alaska
  5. 2.0 8 km SSE of Anchor Point, Alaska
  6. 1.5 23 km WSW of Anchor Point, Alaska
  7. 1.6 9 km NNW of Nanwalek, Alaska
  8. 2.2 30 km WNW of Anchor Point, Alaska
  9. 1.6 38 km W of Anchor Point, Alaska
  10. 2.4 25 km S of Port Graham, Alaska
  11. 1.5 6 km WNW of Diamond Ridge, Alaska
  12. 1.8 23 km NW of Anchor Point, Alaska
  13. 1.6 37 km WSW of Anchor Point, Alaska
  14. 1.6 37 km W of Nanwalek, Alaska
  15. 2.1 41 km WSW of Nanwalek, 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.