QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

Earthquake near Homer, AK

No earthquake was likely felt in Homer in the 24 hours to 9:06 am AKST (18:06 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 2.1 earthquake was recorded 30 km (19 mi) south-southeast of Homer, AK, at 9:48 pm AKDT on 22 September 2023 (05:48 UTC), 43 km deep.

USGS: 20 km S of Halibut Cove, Alaska

9:48 pm AKDT, Sep 22, 2023 · · 43 km deep · released about 43 lb of TNT

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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
9:48 pm AKDT on 22 September 2023 ()
Where
30 km (19 mi) south-southeast of Homer, AK · earthquakes near Homer
Magnitude
M 2.1 (ml)
Depth
43 km below the surface
Felt
no reports yet
Nearest
Kenai Peninsula Borough, 121 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1132 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Homer, 30 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.

How big was it?

This earthquake released about 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.7 on 2023-02-24 — about 7,900 times the energy of this one.

Before 2016, the USGS record lists 9 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 43 km ESE of Halibut Cove, Alaska · 40 km E of this epicentre
  2. 6.0 6 km SSE of Fox River, Alaska · 47 km NNE of this epicentre
  3. 5.7 30 km ESE of Port Graham, Alaska · 20 km S of this epicentre
  4. 5.6 7 km SE of Fritz Creek, Alaska · 30 km N of this epicentre
  5. 5.5 6 km WNW of Nanwalek, Alaska · 43 km W 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 59.4128, -151.2757. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kenai Peninsula Borough, AK 121 km (75 mi) NNW earthquakes near Kenai Peninsula Borough

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

Aftershocks so far

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

  1. 1.9 9 km SW of Homer, Alaska
  2. 2.6 8 km SW of Homer, Alaska
  3. 2.0 21 km SE of Halibut Cove, Alaska
  4. 1.6 12 km N of Fritz Creek, Alaska
  5. 2.0 9 km SSW of Fox River, Alaska
  6. 4.9 8 km SE of Seldovia Village, Alaska
  7. 3.0 8 km SE of Seldovia Village, Alaska
  8. 1.7 10 km NNE of Fritz Creek, Alaska
  9. 1.5 3 km NNW of Diamond Ridge, Alaska
  10. 1.7 9 km ESE of Nikolaevsk, Alaska
  11. 1.6 3 km WNW of Homer, Alaska
  12. 2.1 8 km ESE of Fritz Creek, Alaska
  13. 2.3 3 km WNW of Diamond Ridge, Alaska
  14. 1.5 7 km N of Halibut Cove, Alaska
  15. 2.1 56 km SE of Port Graham, 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.