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M1.7 earthquake 55 km ENE of West Side Highway, Washington, United States

A magnitude 1.7 earthquake struck 55 km ENE of West Side Highway, Washington, United States at 03:34 local time (10:34 UTC) on 22 Oct 2026, at a depth of 11 km, according to USGS.

Data: USGS · updated 2026-10-22 17:46 UTC · reviewed

Magnitude
1.7micro
local magnitude (Richter) (ml)
Depth
11.2 km
Status
Reviewed
Origin time
2026-10-22 10:34:00 UTC
Local: 22 Oct 2026, 03:34:00 (America/Los Angeles)
Epicentre
46.340° N, 122.240° 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. 5,51755 kmINot felt
KelsoWashington, United States · pop. 11,90156 kmINot felt
LongviewWashington, United States · pop. 36,84858 kmINot felt
GrahamWashington, United States · pop. 23,49179 kmINot felt
CamasWashington, United States · pop. 21,84684 kmINot felt
VancouverWashington, United States · pop. 196,44284 kmINot felt
PortlandOregon, United States · pop. 652,50397 kmINot felt
SeattleWashington, United States · pop. 780,995141 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 Survey1.7 ml11.2 km46.34° N, 122.24° 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 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 11 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.7 releases about 11× the energy of M1.0, and its waves are about 4.9× taller on a seismogram. Energy: 5 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

22 later earthquakes within 30 km; the largest was M1.4 19 days ago. 10 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.7

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
39.520.59
43.000.42
53.95-0.12
56.430.15
56.850.43
56.860.43
57.990.86
58.011.47
58.010.46
124.040.610
131.611.3-1
134.580.70
140.620.29
168.200.88
189.140.10
215.160.12
219.040.310
220.410.83
222.900.65
269.090.33
420.801.022
487.800.78
  1. 1.455 km NNE of Battle Ground, Washington, United States10-24 20:34
  2. 1.361 km SSE of Graham, Washington, United States10-27 22:10
  3. 1.039 km ESE of Chehalis, Washington, United States11-08 23:21
  4. 0.854 km NNE of Battle Ground, Washington, United States10-31 14:58
  5. 0.854 km NNE of Battle Ground, Washington, United States10-24 20:33
  6. 0.857 km ESE of Chehalis, Washington, United States10-29 10:46
  7. 0.743 km ESE of Chehalis, Washington, United States11-11 18:21
  8. 0.754 km NNE of Battle Ground, Washington, United States10-28 01:08
  9. 0.654 km NNE of Battle Ground, Washington, United States10-31 17:28
  10. 0.665 km NE of Battle Ground, Washington, United States10-27 14:36
  11. 0.560 km NNE of Battle Ground, Washington, United States10-24 02:04
  12. 0.454 km NNE of Battle Ground, Washington, United States10-24 19:25
  13. 0.454 km NNE of Battle Ground, Washington, United States10-24 05:34
  14. 0.454 km NNE of Battle Ground, Washington, United States10-24 19:25
  15. 0.455 km NNE of Battle Ground, Washington, United States10-24 20:34
  16. 0.354 km NNE of Battle Ground, Washington, United States11-02 15:39
  17. 0.361 km NNE of Battle Ground, Washington, United States10-31 13:36
  18. 0.263 km NE of Battle Ground, Washington, United States10-28 07:11
  19. 0.150 km NNE of Battle Ground, Washington, United States10-30 07:42
  20. 0.154 km NNE of Battle Ground, Washington, United States10-31 09:43
  21. 0.154 km NNE of Battle Ground, Washington, United States10-24 18:59
  22. -0.154 km NNE of Battle Ground, Washington, United States10-24 16:31

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 uw714123982. First recorded here 22 Oct 2026, 17:48:04 UTC. Solutions: USGS · UW (usgs:uw714123982). Cite as: SeismoAtlas, “M1.7 earthquake 55 km ENE of West Side Highway, Washington, United States”, https://seismoatlas.com/earthquake/uw714123982-m1-7-earthquake-55-km-ene-of-west-side-highway-washington-united-states, data from USGS.

JSON: /api/v1/events/uw714123982. SeismoAtlas is not an official warning service.