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SeismoAtlas

M0.6 earthquake 22 km ENE of West Side Highway, Washington, United States

A magnitude 0.6 earthquake struck 22 km ENE of West Side Highway, Washington, United States at 02:25 local time (09:25 UTC) on 4 Oct 2026, at a depth of 17 km, according to USGS.

Data: USGS · updated 2026-10-05 19:04 UTC · reviewed

Magnitude
0.6micro
duration magnitude (md)
Depth
17.2 km
Status
Reviewed
Origin time
2026-10-04 09:25:50 UTC
Local: 4 Oct 2026, 02:25:50 (America/Los Angeles)
Epicentre
46.234° N, 122.640° 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
West Side HighwayWashington, United States · pop. 5,51722 kmINot felt
KelsoWashington, United States · pop. 11,90123 kmINot felt
LongviewWashington, United States · pop. 36,84825 kmINot felt
VancouverWashington, United States · pop. 196,44266 kmINot felt
CamasWashington, United States · pop. 21,84674 kmINot felt
BethanyOregon, United States · pop. 20,64677 kmINot felt
PortlandOregon, United States · pop. 652,50379 kmINot felt
SeattleWashington, United States · pop. 780,995155 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 · UW, which has been reviewed by an analyst.

AgencyMagnitudeDepthEpicentreTime offsetStatus
USGS · UWheadlinePacific Northwest Seismic Network via U.S. Geological Survey0.6 md17.2 km46.23° N, 122.64° W–Reviewed

How big was it?

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

It released roughly the energy of 124 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 17 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 3.8× the energy of M0.6, and its waves are about 2.5× taller on a seismogram. Energy: 477 g of TNT vs 124 g of TNT.

Each square is the energy of one M0.6. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

21 later earthquakes within 30 km; the largest was M1.8 37 days ago. 3 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M0.6

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
16.50-0.09
29.430.818
58.561.817
60.640.617
82.841.617
84.410.617
110.111.60
119.690.312
119.70-0.112
125.570.312
155.520.011
203.520.215
215.010.117
228.900.39
278.411.10
429.510.518
443.370.418
551.480.618
551.500.317
612.501.40
667.981.118
  1. 1.823 km ENE of West Side Highway, Washington, United States10-06 19:59
  2. 1.620 km NNE of West Side Highway, Washington, United States10-08 23:32
  3. 1.622 km ENE of West Side Highway, Washington, United States10-07 20:15
  4. 1.420 km NNE of West Side Highway, Washington, United States10-29 21:55
  5. 1.121 km NNE of West Side Highway, Washington, United States10-15 23:50
  6. 1.122 km ENE of West Side Highway, Washington, United States11-01 05:24
  7. 0.822 km ENE of West Side Highway, Washington, United States10-05 14:51
  8. 0.623 km ENE of West Side Highway, Washington, United States10-06 22:03
  9. 0.651 km ENE of West Side Highway, Washington, United States10-07 21:50
  10. 0.622 km ENE of West Side Highway, Washington, United States10-27 08:54
  11. 0.522 km ENE of West Side Highway, Washington, United States10-22 06:56
  12. 0.432 km NNE of Battle Ground, Washington, United States10-22 20:47
  13. 0.347 km E of Kelso, Washington, United States10-09 09:07
  14. 0.347 km E of Kelso, Washington, United States10-09 15:00
  15. 0.342 km E of Kelso, Washington, United States10-13 22:19
  16. 0.323 km ENE of West Side Highway, Washington, United States10-27 08:55
  17. 0.245 km E of Kelso, Washington, United States10-12 20:57
  18. 0.123 km ENE of West Side Highway, Washington, United States10-13 08:26
  19. 0.047 km E of Kelso, Washington, United States10-10 20:57
  20. -0.042 km E of Kelso, Washington, United States10-05 01:55
  21. -0.147 km E of Kelso, Washington, United States10-09 09:07

Did you feel it?

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

Reports close 14 days after an earthquake.

Reports on SeismoAtlas

No reports yet.

Event id uw714115551. First recorded here 5 Oct 2026, 19:32:34 UTC. Solutions: USGS · UW (usgs:uw714115551). Cite as: SeismoAtlas, “M0.6 earthquake 22 km ENE of West Side Highway, Washington, United States”, https://seismoatlas.com/earthquake/uw714115551-m0-6-earthquake-22-km-ene-of-west-side-highway-washington-united-states, data from USGS.

JSON: /api/v1/events/uw714115551. SeismoAtlas is not an official warning service.