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 10:41 local time (18:41 UTC) on 27 Sept 2026, at a depth of 5 km, according to USGS.

Data: USGS · updated 2026-09-29 21:31 UTC · reviewed

Magnitude: -0.3micro
local magnitude (Richter) (ml)
Depth: 4.7 km
Status: Reviewed
Origin time: 2026-09-27 18:41:36 UTC; Local: 27 Sept 2026, 10:41:36 (America/Anchorage)
Epicentre: 59.946° N, 153.203° 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
Place	Distance	Est. shaking
HomerAlaska, United States · pop. 5,515	99 km	INot felt
KalifornskyAlaska, United States · pop. 7,850	118 km	INot felt
AnchorageAlaska, United States · pop. 289,600	229 km	INot 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.

Agency	Magnitude	Depth	Epicentre	Time offset	Status
USGS · AVheadlineAlaska Volcano Observatory via U.S. Geological Survey	-0.3 ml	4.7 km	59.95° N, 153.20° W	–	Reviewed

How big was it?

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

It released roughly the energy of 5 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 5 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

Compare M-0.3 with M1.0

M1.0 releases about 102× the energy of M-0.3, and its waves are about 22× taller on a seismogram. Energy: 477 g of TNT vs 5 g of TNT.

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

Aftershocks and nearby activity

114 later earthquakes within 30 km; the largest was M3.1 9 days ago. 46 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M-0.3

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

Aftershocks
Time after mainshock (hours)	Magnitude	Depth (km)
0.04	-0.2	-1
3.44	-0.7	4
5.70	-0.7	0
6.37	3.1	138
8.73	2.1	135
9.51	1.8	120
10.76	-0.4	3
14.40	1.7	107
14.43	0.2	12
15.16	-0.4	6
16.85	1.9	125
18.24	1.0	100
23.12	-0.7	0
24.45	-1.0	1
26.07	0.6	4
27.15	-0.8	4
27.73	-0.7	-2
34.56	-0.7	2
44.71	1.0	68
48.25	-1.0	3
52.95	-0.7	0
53.77	0.5	5
54.46	-0.8	1
56.40	-1.1	-2
62.33	-0.9	0
65.37	-0.8	3
66.76	0.5	5
67.00	-0.9	2
67.10	1.8	126
67.65	0.5	5
67.95	-1.0	-2
68.33	-0.4	1
69.36	-0.9	1
71.60	2.0	154
74.15	-1.2	-2
75.81	0.8	5
77.90	-0.3	0
78.33	-0.6	1
79.11	0.8	33
79.16	-0.6	0
79.48	2.2	129
83.46	1.5	99
85.80	-0.5	0
88.81	-0.8	-1
89.20	0.6	26
93.99	-1.0	1
96.72	-0.8	1
97.41	-0.7	2
100.61	0.4	33
100.67	1.0	46
101.57	1.9	145
101.95	-0.9	2
102.53	-0.7	1
105.14	-1.1	1
107.72	-1.2	0
109.10	-0.4	-2
109.86	-0.8	2
111.29	-1.2	0
111.94	-1.1	1
112.11	-1.0	2
112.34	0.3	5
113.39	-0.9	6
118.43	-0.5	-3
121.59	-0.7	2
122.99	-1.1	-2
123.07	-0.9	1
123.22	-0.2	5
123.25	-0.5	0
124.30	-1.0	-1
125.23	-0.8	0
126.04	-0.5	1
126.68	-0.3	0
128.76	0.7	5
129.48	-0.8	3
132.45	0.5	5
132.85	1.5	103
133.05	0.6	5
134.00	0.8	96
155.61	-0.1	1
159.57	-0.6	-2
165.25	2.4	133
165.72	-0.9	-2
167.17	-0.8	1
178.70	1.9	107
179.28	-0.9	1
181.84	1.2	118
181.90	-0.1	-1
182.15	0.4	5
185.48	2.6	125
186.10	0.7	5
186.60	0.5	5
189.33	1.8	139
189.56	0.3	5
190.44	0.2	1
190.74	0.3	0
198.00	-1.3	3
198.04	0.4	5
201.52	-0.8	5
206.71	-0.8	0
207.40	-0.6	2
208.84	-0.9	1
210.12	-0.9	1
210.41	-1.2	0
210.67	-0.9	2
213.37	-1.2	-1
213.87	-1.1	-2
215.64	0.8	7
216.12	-0.8	5
216.50	1.0	97
217.27	-0.7	4
219.50	1.6	97
221.23	-0.4	-2
222.16	2.0	172
235.61	0.1	5

Did you feel it?

Reports from people help show where shaking was strong. They are anonymous and shown here in aggregate.

Reports on SeismoAtlas

No reports yet.

Event id av94451681. First recorded here 29 Sept 2026, 21:32:16 UTC. Solutions: USGS · AV (usgs:av94451681). Cite as: SeismoAtlas, “M-0.3 earthquake 99 km WNW of Homer, Alaska, United States”, https://seismoatlas.com/earthquake/av94451681-m-0-3-earthquake-99-km-wnw-of-homer-alaska-united-states, data from USGS.

JSON: /api/v1/events/av94451681. SeismoAtlas is not an official warning service.