Skip to content
SeismoAtlas

M1.3 earthquake 22 km ENE of West Side Highway, Washington, United States

A magnitude 1.3 earthquake struck 22 km ENE of West Side Highway, Washington, United States at 14:15 local time (21:15 UTC) on 27 Sept 2026, at a depth of 17 km, according to USGS.

Data: USGS · updated 2026-09-27 21:47 UTC · reviewed

Magnitude
1.3micro
local magnitude (Richter) (ml)
Depth
16.9 km
Status
Reviewed
Origin time
2026-09-27 21:15:13 UTC
Local: 27 Sept 2026, 14:15:13 (America/Los Angeles)
Epicentre
46.244° N, 122.643° 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. 36,84826 kmINot felt
VancouverWashington, United States · pop. 196,44267 kmINot felt
CamasWashington, United States · pop. 21,84675 kmINot felt
BethanyOregon, United States · pop. 20,64678 kmINot felt
PortlandOregon, United States · pop. 652,50381 kmINot felt
SeattleWashington, United States · pop. 780,995154 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 Survey1.3 ml16.9 km46.24° 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 2 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 17 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.3 releases about 3.2× the energy of M1.0, and its waves are about 2.2× taller on a seismogram. Energy: 2 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

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

Aftershocks

Mainshock M1.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
3.451.416
5.360.718
156.180.617
172.68-0.09
185.600.818
214.741.817
216.810.617
239.011.617
240.590.617
266.291.60
275.870.312
275.88-0.112
281.750.312
311.700.011
359.700.215
371.190.117
385.080.39
434.581.10
585.680.518
707.650.618
707.670.317
  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. 1.428 km ENE of Woodland, Washington, United States09-28 00:42
  5. 1.121 km NNE of West Side Highway, Washington, United States10-15 23:50
  6. 0.822 km ENE of West Side Highway, Washington, United States10-05 14:51
  7. 0.722 km ENE of West Side Highway, Washington, United States09-28 02:36
  8. 0.622 km ENE of West Side Highway, Washington, United States10-04 09:25
  9. 0.623 km ENE of West Side Highway, Washington, United States10-06 22:03
  10. 0.651 km ENE of West Side Highway, Washington, United States10-07 21:50
  11. 0.622 km ENE of West Side Highway, Washington, United States10-27 08:54
  12. 0.522 km ENE of West Side Highway, Washington, United States10-22 06:56
  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 uw714110532. First recorded here 28 Sept 2026, 17:32:07 UTC. Solutions: USGS · UW (usgs:uw714110532). Cite as: SeismoAtlas, “M1.3 earthquake 22 km ENE of West Side Highway, Washington, United States”, https://seismoatlas.com/earthquake/uw714110532-m1-3-earthquake-22-km-ene-of-west-side-highway-washington-united-states, data from USGS.

JSON: /api/v1/events/uw714110532. SeismoAtlas is not an official warning service.