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SeismoAtlas

M-0.3 earthquake 99 km WNW of Homer, Alaska, United States

A magnitude -0.3 earthquake struck 99 km WNW of Homer, Alaska, United States at 17:11 local time (01:11 UTC) on 21 Sept 2026, at a depth of 2 km, according to USGS.

Data: USGS · updated 2026-09-22 20:46 UTC · reviewed

Magnitude
-0.3micro
local magnitude (Richter) (ml)
Depth
2 km
Status
Reviewed
Origin time
2026-09-22 01:11:03 UTC
Local: 21 Sept 2026, 17:11:03 (America/Anchorage)
Epicentre
60.038° N, 153.127° 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. 5,51599 kmINot felt
KalifornskyAlaska, United States · pop. 7,850110 kmINot felt
AnchorageAlaska, United States · pop. 289,600220 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 · AV, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AVheadlineAlaska Volcano Observatory via U.S. Geological Survey-0.3 ml2 km60.04° N, 153.13° 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 6 g 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 2 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.0 releases about 80× the energy of M-0.3, and its waves are about 19× taller on a seismogram. Energy: 477 g of TNT vs 6 g of TNT.

Each square is the energy of one M-0.3. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

41 later earthquakes within 30 km; the largest was M3.1 20 h ago. 5 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M-0.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
2.57-0.3-1
4.28-0.26
10.261.492
14.65-0.6-2
15.380.22
16.23-0.80
16.95-0.20
20.31-0.50
21.192.2149
22.12-0.72
23.331.9136
24.59-0.30
38.981.487
40.462.8101
41.42-0.6-1
42.062.1135
44.371.6142
48.821.5126
50.98-0.4-3
52.47-0.52
54.29-0.35
54.68-0.8-2
57.43-0.6-1
57.760.65
60.47-1.10
61.12-0.61
62.870.45
64.150.06
65.200.315
68.34-0.43
69.70-0.52
72.74-0.36
73.28-0.91
98.322.3134
101.320.1-2
110.522.4124
134.611.7119
135.782.6128
143.21-0.70
143.883.1138
163.580.64
  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. 2.687 km WNW of Homer, Alaska, United States09-27 16:58
  4. 2.485 km WNW of Homer, Alaska, United States09-26 15:42
  5. 2.392 km WNW of Homer, Alaska, United States09-26 03:30
  6. 2.2104 km WNW of Homer, Alaska, United States09-22 22:22
  7. 2.1100 km WNW of Homer, Alaska, United States09-23 19:14
  8. 1.9101 km WNW of Homer, Alaska, United States09-23 00:30
  9. 1.783 km NW of Homer, Alaska, United States09-27 15:47
  10. 1.6102 km W of Kalifornsky, Alaska, United States09-23 21:33
  11. 1.5101 km WNW of Homer, Alaska, United States09-24 02:00
  12. 1.475 km WNW of Homer, Alaska, United States09-22 11:26
  13. 1.473 km WNW of Homer, Alaska, United States09-23 16:09
  14. 0.6112 km WNW of Homer, Alaska, United States09-24 10:56
  15. 0.696 km WNW of Homer, Alaska, United States09-28 20:45
  16. 0.496 km WNW of Homer, Alaska, United States09-24 16:03
  17. 0.3111 km WNW of Homer, Alaska, United States09-24 18:23
  18. 0.293 km WNW of Homer, Alaska, United States09-22 16:33
  19. 0.196 km WNW of Homer, Alaska, United States09-26 06:29
  20. 0.088 km WNW of Homer, Alaska, United States09-24 17:20
  21. -0.2102 km WNW of Homer, Alaska, United States09-22 05:27
  22. -0.296 km WNW of Homer, Alaska, United States09-22 18:07
  23. -0.396 km WNW of Homer, Alaska, United States09-22 03:45
  24. -0.394 km WNW of Homer, Alaska, United States09-25 01:55
  25. -0.3100 km WNW of Homer, Alaska, United States09-24 07:28

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Reports on SeismoAtlas

No reports yet.

Event id av94442641. First recorded here 28 Sept 2026, 17:32:12 UTC. Solutions: USGS · AV (usgs:av94442641). Cite as: SeismoAtlas, “M-0.3 earthquake 99 km WNW of Homer, Alaska, United States”, https://seismoatlas.com/earthquake/av94442641-m-0-3-earthquake-99-km-wnw-of-homer-alaska-united-states, data from USGS.

JSON: /api/v1/events/av94442641. SeismoAtlas is not an official warning service.