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M1.9 earthquake 92 km W of Homer, Alaska, United States

A magnitude 1.9 earthquake struck 92 km W of Homer, Alaska, United States at 21:23 local time (05:23 UTC) on 4 Oct 2026, at a depth of 107 km, according to USGS. The solution is preliminary and may be revised.

revised from M1.6

Data: USGS · updated 2026-10-05 05:25 UTC · automatic solution

Magnitude
1.9micro
local magnitude (Richter) (ml)
revised from 1.6
Depth
107.2 km
Status
Automatic
Origin time
2026-10-05 05:23:38 UTC
Local: 4 Oct 2026, 21:23:38 (America/Anchorage)
Epicentre
59.678° N, 153.183° 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. 5,51592 kmINot felt
KalifornskyAlaska, United States · pop. 7,850134 kmINot felt
AnchorageAlaska, United States · pop. 289,600249 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.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · AKheadlineAlaska Earthquake Center via U.S. Geological Survey1.9 mlwas 1.6107.2 km59.68° N, 153.18° W–Automatic · 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 11 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.

M1.9 releases about 22× the energy of M1.0, and its waves are about 7.9× taller on a seismogram. Energy: 11 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

5 later earthquakes within 30 km; the largest was M1.8 1 day ago. 10 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.9

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
7.900.55
10.631.8139
32.081.788
36.940.87
37.801.097
  1. 1.8100 km WNW of Homer, Alaska, United States10-05 16:01
  2. 1.771 km W of Homer, Alaska, United States10-06 13:28
  3. 1.077 km WNW of Homer, Alaska, United States10-06 19:11
  4. 0.8101 km WNW of Homer, Alaska, United States10-06 18:19
  5. 0.598 km WNW of Homer, Alaska, United States10-05 13:17

Did you feel it?

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Reports on SeismoAtlas

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Event id aka2026tsawar. First recorded here 5 Oct 2026, 05:25:48 UTC. Solutions: USGS · AK (usgs:aka2026tsawar). Cite as: SeismoAtlas, “M1.9 earthquake 92 km W of Homer, Alaska, United States”, https://seismoatlas.com/earthquake/aka2026tsawar-m1-9-earthquake-92-km-w-of-homer-alaska-united-states, data from USGS.

JSON: /api/v1/events/aka2026tsawar. SeismoAtlas is not an official warning service.