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M2.8 earthquake 77 km WNW of Homer, Alaska, United States

A magnitude 2.8 earthquake struck 77 km WNW of Homer, Alaska, United States at 09:38 local time (17:38 UTC) on 23 Sept 2026, at a depth of 102 km, according to USGS.

Data: USGS · updated 2026-10-07 07:07 UTC · reviewed

Magnitude
2.8micro
local magnitude (Richter) (ml)
Depth
101.5 km
Status
Reviewed
Origin time
2026-09-23 17:38:48 UTC
Local: 23 Sept 2026, 09:38:48 (America/Anchorage)
Epicentre
59.881° N, 152.838° 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. 5,51577 kmINot felt
KalifornskyAlaska, United States · pop. 7,850105 kmINot felt
AnchorageAlaska, United States · pop. 289,600219 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 Survey2.8 ml101.5 km59.88° N, 152.84° W–Reviewed · 1 revision

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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 239 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 102 km this was a intermediate-depth earthquake, which spreads shaking over a wider area but less intensely.

M2.8 releases about 32× the energy of M1.8, and its waves are about 10× taller on a seismogram. Energy: 239 kg of TNT vs 8 kg of TNT.

Each square is the energy of one M1.8. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

142 later earthquakes within 30 km; the largest was M3.6 8 days ago. 22 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M2.8

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.96-0.6-1
1.602.1135
8.351.5126
10.52-0.4-3
12.00-0.52
13.83-0.35
14.22-0.8-2
16.97-0.6-1
17.391.9135
20.01-1.10
20.66-0.61
22.410.45
23.690.06
27.87-0.43
29.24-0.52
32.27-0.36
32.82-0.91
57.491.9102
57.862.2132
60.171.8108
60.850.1-2
70.062.4124
94.151.7119
95.322.7128
97.05-0.35
97.08-0.2-1
99.792.288
100.49-0.74
102.75-0.70
103.413.1138
106.561.8120
107.81-0.43
111.451.7107
111.480.212
112.21-0.46
113.891.9125
115.281.0100
119.093.687
120.17-0.70
121.49-1.01
123.120.64
124.20-0.84
124.78-0.7-2
131.61-0.72
133.681.6102
145.30-1.03
149.99-0.70
150.810.55
151.51-0.81
153.45-1.1-2
159.37-0.90
162.42-0.83
163.800.55
164.04-0.92
164.151.8126
164.700.55
165.00-1.0-2
165.37-0.41
166.41-0.91
167.932.087
168.642.0154
171.20-1.2-2
172.860.85
174.95-0.30
175.38-0.61
176.20-0.60
176.532.2129
177.733.094
180.501.599
182.771.899
182.85-0.50
185.85-0.8-1
191.04-1.01
193.77-0.81
193.842.6100
194.46-0.72
195.022.1112
197.650.433
197.721.046
198.611.9145
199.00-0.92
199.57-0.71
202.19-1.11
204.76-1.20
206.14-0.4-2
206.90-0.82
208.33-1.20
208.99-1.11
209.16-1.02
209.380.35
210.43-0.96
215.47-0.5-3
218.64-0.72
220.04-1.1-2
220.11-0.91
220.26-0.25
220.30-0.50
221.34-1.0-1
222.27-0.80
223.09-0.51
223.73-0.30
225.810.75
226.53-0.83
229.500.55
229.891.5103
230.090.65
231.040.896
252.65-0.11
256.62-0.6-2
262.302.4133
262.77-0.9-2
264.22-0.81
266.401.894
275.751.9107
276.32-0.91
278.891.2118
278.95-0.1-1
279.190.45
282.522.6125
283.140.75
283.650.55
286.371.8139
286.610.35
287.490.21
287.790.30
295.05-1.33
295.090.45
298.57-0.85
303.76-0.80
304.45-0.62
305.89-0.91
307.17-0.91
307.46-1.20
307.72-0.92
307.831.788
310.41-1.2-1
310.92-1.1-2
312.690.87
313.17-0.85
313.541.097
314.32-0.74
318.28-0.4-2
  1. 3.657 km W of Homer, Alaska, United States09-28 16:44
  2. 3.1101 km WNW of Homer, Alaska, United States09-28 01:03
  3. 3.060 km NW of Homer, Alaska, United States10-01 03:22
  4. 2.787 km WNW of Homer, Alaska, United States09-27 16:58
  5. 2.668 km NW of Homer, Alaska, United States10-01 19:28
  6. 2.695 km NW of Homer, Alaska, United States10-05 12:10
  7. 2.485 km WNW of Homer, Alaska, United States09-26 15:42
  8. 2.499 km WNW of Homer, Alaska, United States10-04 15:56
  9. 2.293 km WNW of Homer, Alaska, United States09-26 03:30
  10. 2.264 km W of Homer, Alaska, United States09-27 21:26
  11. 2.299 km WNW of Homer, Alaska, United States10-01 02:10
  12. 2.1100 km WNW of Homer, Alaska, United States09-23 19:14
  13. 2.181 km NW of Homer, Alaska, United States10-01 20:39
  14. 2.064 km WNW of Homer, Alaska, United States09-30 17:34
  15. 2.0103 km WNW of Homer, Alaska, United States09-30 18:17
  16. 1.9100 km W of Homer, Alaska, United States09-24 11:01
  17. 1.984 km W of Homer, Alaska, United States09-26 03:08
  18. 1.997 km WNW of Homer, Alaska, United States09-28 11:32
  19. 1.9100 km WNW of Homer, Alaska, United States10-02 00:15
  20. 1.992 km W of Homer, Alaska, United States10-05 05:23
  21. 1.890 km NW of Homer, Alaska, United States09-26 05:49
  22. 1.899 km WNW of Homer, Alaska, United States09-28 04:12
  23. 1.898 km W of Homer, Alaska, United States09-30 13:47
  24. 1.873 km WNW of Homer, Alaska, United States10-01 08:25
  25. 1.860 km WNW of Homer, Alaska, United States10-04 20:03

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Event id aka2026swvbrg. First recorded here 28 Sept 2026, 17:32:10 UTC. Solutions: USGS · AK (usgs:aka2026swvbrg). Cite as: SeismoAtlas, “M2.8 earthquake 77 km WNW of Homer, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026swvbrg-m2-8-earthquake-77-km-wnw-of-homer-alaska-united-states, data from USGS.

JSON: /api/v1/events/aka2026swvbrg. SeismoAtlas is not an official warning service.