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M1.6 earthquake 78 km NW of Homer, Alaska, United States

A magnitude 1.6 earthquake struck 78 km NW of Homer, Alaska, United States at 23:19 local time (07:19 UTC) on 28 Sept 2026, at a depth of 102 km, according to USGS.

revised from M1.3

Data: USGS · updated 2026-10-05 23:06 UTC · reviewed

Magnitude
1.6micro
local magnitude (Richter) (ml)
revised from 1.3
Depth
102.2 km
Status
Reviewed
Origin time
2026-09-29 07:19:41 UTC
Local: 28 Sept 2026, 23:19:41 (America/Anchorage)
Epicentre
60.066° N, 152.665° 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. 5,51578 kmINot felt
KalifornskyAlaska, United States · pop. 7,85085 kmINot felt
AnchorageAlaska, United States · pop. 289,600198 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 Survey1.6 mlwas 1.3102.2 km60.07° N, 152.66° 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 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 102 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

90 later earthquakes within 30 km; the largest was M3.0 5 days ago. 54 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.6

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
0.511.4102
8.081.068
11.62-1.03
16.31-0.70
17.130.55
17.82-0.81
19.77-1.1-2
25.69-0.90
28.74-0.83
30.120.55
30.36-0.92
31.010.55
31.31-1.0-2
31.69-0.41
32.73-0.91
34.252.087
37.52-1.2-2
39.170.85
41.132.1106
41.26-0.30
41.70-0.61
42.52-0.60
43.071.397
44.053.094
49.091.899
49.17-0.50
52.17-0.8-1
57.36-1.01
60.09-0.81
60.152.6100
60.78-0.72
61.342.1112
63.970.433
64.041.046
64.931.9145
65.31-0.92
65.89-0.71
68.51-1.11
69.201.7125
71.08-1.20
72.46-0.4-2
73.22-0.82
74.65-1.20
75.31-1.11
75.47-1.02
75.700.35
76.75-0.96
81.79-0.5-3
84.95-0.72
86.36-1.1-2
86.43-0.91
86.58-0.25
86.62-0.50
87.66-1.0-1
88.59-0.80
89.41-0.51
90.05-0.30
92.130.75
92.85-0.83
95.820.55
96.211.5103
96.410.65
97.360.896
114.522.2128
118.97-0.11
122.94-0.6-2
123.901.3160
129.09-0.9-2
130.54-0.81
142.64-0.91
145.211.2118
145.27-0.1-1
145.510.45
147.783.0105
148.842.6125
149.460.75
152.930.35
153.810.21
154.100.30
161.36-1.33
161.410.45
164.88-0.85
170.08-0.80
170.370.6100
170.77-0.62
172.21-0.91
173.49-0.91
173.78-1.20
174.04-0.92
179.861.097
  1. 3.060 km NW of Homer, Alaska, United States10-01 03:22
  2. 3.069 km WSW of Kalifornsky, Alaska, United States10-05 11:06
  3. 2.668 km NW of Homer, Alaska, United States10-01 19:28
  4. 2.695 km NW of Homer, Alaska, United States10-05 12:10
  5. 2.2101 km WSW of Kalifornsky, Alaska, United States10-04 01:51
  6. 2.178 km WSW of Kalifornsky, Alaska, United States10-01 00:27
  7. 2.181 km NW of Homer, Alaska, United States10-01 20:39
  8. 2.064 km WNW of Homer, Alaska, United States09-30 17:34
  9. 1.9100 km WNW of Homer, Alaska, United States10-02 00:15
  10. 1.873 km WNW of Homer, Alaska, United States10-01 08:25
  11. 1.783 km WSW of Kalifornsky, Alaska, United States10-02 04:31
  12. 1.585 km WNW of Homer, Alaska, United States10-03 07:32
  13. 1.477 km WSW of Kalifornsky, Alaska, United States09-29 07:50
  14. 1.372 km WSW of Kalifornsky, Alaska, United States10-01 02:23
  15. 1.368 km WSW of Kalifornsky, Alaska, United States10-04 11:13
  16. 1.292 km WNW of Homer, Alaska, United States10-05 08:32
  17. 1.0102 km WSW of Kalifornsky, Alaska, United States09-29 15:24
  18. 1.093 km WNW of Homer, Alaska, United States10-01 23:21
  19. 1.077 km WNW of Homer, Alaska, United States10-06 19:11
  20. 0.8100 km WNW of Homer, Alaska, United States09-30 22:30
  21. 0.880 km WNW of Homer, Alaska, United States10-03 08:41
  22. 0.796 km WNW of Homer, Alaska, United States10-03 03:27
  23. 0.792 km WNW of Homer, Alaska, United States10-05 12:47
  24. 0.696 km WNW of Homer, Alaska, United States10-03 07:44
  25. 0.677 km WSW of Kalifornsky, Alaska, United States10-06 09:41

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Event id aka2026thcpft. First recorded here 29 Sept 2026, 07:21:35 UTC. Solutions: USGS · AK (usgs:aka2026thcpft). Cite as: SeismoAtlas, “M1.6 earthquake 78 km NW of Homer, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026thcpft-m1-6-earthquake-78-km-nw-of-homer-alaska-united-states, data from USGS.

JSON: /api/v1/events/aka2026thcpft. SeismoAtlas is not an official warning service.