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M1.7 earthquake 87 km W of Homer, Alaska, United States

A magnitude 1.7 earthquake struck 87 km W of Homer, Alaska, United States at 01:05 local time (09:05 UTC) on 28 Sept 2026, at a depth of 107 km, according to USGS.

Data: USGS · updated 2026-09-29 22:40 UTC · reviewed

Magnitude
1.7micro
local magnitude (Richter) (ml)
Depth
106.8 km
Status
Reviewed
Origin time
2026-09-28 09:05:37 UTC
Local: 28 Sept 2026, 01:05:37 (America/Anchorage)
Epicentre
59.779° N, 153.071° W

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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. 7,850122 kmINot felt
AnchorageAlaska, United States · pop. 289,600236 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, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey1.7 ml106.8 km59.78° N, 153.07° W–Reviewed

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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 5 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 107 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M1.7 releases about 11× the energy of M1.0, and its waves are about 5× taller on a seismogram. Energy: 5 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

73 later earthquakes within 30 km; the largest was M2.4 2 days ago. 44 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.451.9125
8.72-0.70
12.75-0.84
13.33-0.7-2
20.16-0.72
33.85-1.03
38.55-0.70
39.370.55
40.06-0.81
47.92-0.90
50.97-0.83
52.60-0.92
52.701.8126
53.250.55
53.55-1.0-2
53.93-0.41
57.202.0154
59.75-1.2-2
63.50-0.30
63.93-0.61
64.76-0.60
65.082.2129
69.061.599
71.40-0.50
74.40-0.8-1
79.59-1.01
83.01-0.72
86.210.433
86.271.046
90.74-1.11
93.32-1.20
94.70-0.4-2
95.46-0.82
96.89-1.20
97.54-1.11
97.940.35
98.99-0.96
104.03-0.5-3
107.19-0.72
108.82-0.25
108.85-0.50
109.89-1.0-1
110.83-0.80
111.64-0.51
114.360.75
115.08-0.83
118.050.55
118.451.5103
118.650.65
141.21-0.11
145.17-0.6-2
150.852.4133
151.32-0.9-2
152.77-0.81
154.961.894
164.301.9107
164.87-0.91
167.50-0.1-1
167.750.45
171.700.75
172.200.55
174.931.8139
175.160.35
176.340.30
183.640.45
187.12-0.85
192.31-0.80
194.44-0.91
195.72-0.91
196.01-1.20
196.381.788
201.240.87
202.101.097
  1. 2.499 km WNW of Homer, Alaska, United States10-04 15:56
  2. 2.299 km WNW of Homer, Alaska, United States10-01 02:10
  3. 2.0103 km WNW of Homer, Alaska, United States09-30 18:17
  4. 1.997 km WNW of Homer, Alaska, United States09-28 11:32
  5. 1.992 km W of Homer, Alaska, United States10-05 05:23
  6. 1.898 km W of Homer, Alaska, United States09-30 13:47
  7. 1.860 km WNW of Homer, Alaska, United States10-04 20:03
  8. 1.8100 km WNW of Homer, Alaska, United States10-05 16:01
  9. 1.771 km W of Homer, Alaska, United States10-06 13:28
  10. 1.577 km W of Homer, Alaska, United States10-01 06:08
  11. 1.585 km WNW of Homer, Alaska, United States10-03 07:32
  12. 1.093 km WNW of Homer, Alaska, United States10-01 23:21
  13. 1.077 km WNW of Homer, Alaska, United States10-06 19:11
  14. 0.8101 km WNW of Homer, Alaska, United States10-06 18:19
  15. 0.796 km WNW of Homer, Alaska, United States10-03 03:27
  16. 0.792 km WNW of Homer, Alaska, United States10-05 12:47
  17. 0.696 km WNW of Homer, Alaska, United States10-03 07:44
  18. 0.596 km WNW of Homer, Alaska, United States09-30 00:27
  19. 0.596 km WNW of Homer, Alaska, United States09-30 14:20
  20. 0.594 km WNW of Homer, Alaska, United States10-03 07:08
  21. 0.598 km WNW of Homer, Alaska, United States10-05 13:17
  22. 0.489 km WNW of Homer, Alaska, United States10-01 23:18
  23. 0.497 km WNW of Homer, Alaska, United States10-05 08:50
  24. 0.498 km WNW of Homer, Alaska, United States10-06 00:44
  25. 0.396 km WNW of Homer, Alaska, United States10-02 11:01

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Reports on SeismoAtlas

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Event id aka2026tfkcns. First recorded here 29 Sept 2026, 23:32:16 UTC. Solutions: USGS · AK (usgs:aka2026tfkcns). Cite as: SeismoAtlas, “M1.7 earthquake 87 km W of Homer, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026tfkcns-m1-7-earthquake-87-km-w-of-homer-alaska-united-states, data from USGS.

JSON: /api/v1/events/aka2026tfkcns. SeismoAtlas is not an official warning service.