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M1.6 earthquake 87 km W of Homer, Alaska, United States

A magnitude 1.6 earthquake struck 87 km W of Homer, Alaska, United States at 03:33 local time (11:33 UTC) on 23 Sept 2026, at a depth of 108 km, according to USGS. The solution is preliminary and may be revised.

Data: USGS · updated 2026-09-23 11:35 UTC · automatic solution

Magnitude
1.6micro
local magnitude (Richter) (ml)
Depth
107.7 km
Status
Automatic
Origin time
2026-09-23 11:33:32 UTC
Local: 23 Sept 2026, 03:33:32 (America/Anchorage)
Epicentre
59.751° N, 153.076° W

Circles show this event and others within 30 km from 7 days before to 30 days after. Lines: plate boundaries and GEM active faults. Open on the live map

Nearby places

Distance and estimated shaking at nearby places
PlaceDistanceEst. shaking
HomerAlaska, United States · pop. 5,51587 kmINot felt
KalifornskyAlaska, United States · pop. 7,850124 kmINot felt
AnchorageAlaska, United States · pop. 289,600239 kmINot felt

Shaking is an estimate from the intensity prediction equation of Allen, Wald & Worden (2012), not an observation. Local ground and buildings can change it by a level or more.

Every agency's solution

Agencies locate earthquakes with their own stations and methods, so their numbers differ. We match reports of the same event by time, distance and magnitude and show them side by side. The headline uses USGS · AK.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey1.6 ml107.7 km59.75° N, 153.08° W–Automatic

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How big was it?

Usually not felt. Recorded by nearby seismometers; thousands occur worldwide every day.

It released roughly the energy of 4 kg of TNT. Magnitude is logarithmic: each whole step means about 32 times more energy and 10 times larger waves on a seismogram. Depth matters too: at 108 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M1.6 releases about 7.9× the energy of M1.0, and its waves are about 4× taller on a seismogram. Energy: 4 kg of TNT vs 477 g of TNT.

Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

14 later earthquakes within 30 km; the largest was M3.1 20 h ago. 10 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.6

14 later earthquakes nearby. Aftershock rates typically fall off roughly as 1/time (Omori's law).

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
6.092.8101
7.682.1135
16.61-0.4-3
23.471.9135
26.74-0.61
28.500.45
30.312.7139
38.36-0.36
38.90-0.91
63.952.3134
76.152.4124
101.412.6128
105.882.288
109.503.1138
  1. 3.1101 km WNW of Homer, Alaska, United States09-28 01:03
  2. 2.876 km WNW of Homer, Alaska, United States09-23 17:38
  3. 2.7112 km W of Homer, Alaska, United States09-24 17:52
  4. 2.687 km WNW of Homer, Alaska, United States09-27 16:58
  5. 2.485 km WNW of Homer, Alaska, United States09-26 15:42
  6. 2.392 km WNW of Homer, Alaska, United States09-26 03:30
  7. 2.264 km W of Homer, Alaska, United States09-27 21:26
  8. 2.1100 km WNW of Homer, Alaska, United States09-23 19:14
  9. 1.9100 km W of Homer, Alaska, United States09-24 11:01
  10. 0.496 km WNW of Homer, Alaska, United States09-24 16:03
  11. -0.394 km WNW of Homer, Alaska, United States09-25 01:55
  12. -0.495 km WNW of Homer, Alaska, United States09-24 04:10
  13. -0.693 km WNW of Homer, Alaska, United States09-24 14:18
  14. -0.997 km WNW of Homer, Alaska, United States09-25 02:27

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Reports on SeismoAtlas

No reports yet.

Event id aka2026swixyv. First recorded here 28 Sept 2026, 17:32:11 UTC. Solutions: USGS · AK (usgs:aka2026swixyv). Cite as: SeismoAtlas, “M1.6 earthquake 87 km W of Homer, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026swixyv-m1-6-earthquake-87-km-w-of-homer-alaska-united-states, data from USGS.

JSON: /api/v1/events/aka2026swixyv. SeismoAtlas is not an official warning service.