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M1.4 earthquake 28 km ENE of Woodland, Washington, United States

A magnitude 1.4 earthquake struck 28 km ENE of Woodland, Washington, United States at 17:42 local time (00:42 UTC) on 27 Sept 2026, at a depth of 16 km, according to USGS.

Data: USGS · updated 2026-09-28 21:51 UTC · reviewed

Magnitude
1.4micro
duration magnitude (md)
Depth
15.8 km
Status
Reviewed
Origin time
2026-09-28 00:42:04 UTC
Local: 27 Sept 2026, 17:42:04 (America/Los Angeles)
Epicentre
46.035° N, 122.434° 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
WoodlandWashington, United States · pop. 5,84228 kmINot felt
Battle GroundWashington, United States · pop. 19,40729 kmINot felt
LongviewWashington, United States · pop. 36,84841 kmINot felt
VancouverWashington, United States · pop. 196,44247 kmINot felt
CamasWashington, United States · pop. 21,84650 kmINot felt
GreshamOregon, United States · pop. 110,55360 kmINot felt
PortlandOregon, United States · pop. 652,50360 kmINot felt
SeattleWashington, United States · pop. 780,995175 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 Survey1.4 md15.8 km46.04° N, 122.43° 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 16 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.4 releases about 3.6× the energy of M1.0, and its waves are about 2.3× 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

77 later earthquakes within 30 km; the largest was M1.8 40 days ago. 9 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.4

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
1.910.718
36.701.63
51.260.52
63.130.23
63.840.61
83.290.22
90.870.01
91.260.31
103.580.52
123.961.81
147.870.53
152.730.617
168.481.010
169.23-0.09
171.62-0.26
176.360.12
176.730.11
182.160.818
206.830.13
211.291.817
213.370.617
227.080.12
235.571.617
236.790.13
237.870.21
238.091.1-1
242.190.73
256.820.13
272.420.312
272.43-0.112
278.300.312
279.970.32
308.250.011
327.710.12
338.331.113
340.320.23
344.321.213
344.700.714
354.28-0.22
354.920.13
355.29-0.12
356.250.215
357.28-0.03
357.960.61
363.000.17
366.260.13
367.740.117
375.770.53
381.630.39
396.470.43
413.100.43
413.780.26
416.920.43
436.160.43
443.270.52
453.170.41
458.530.53
458.920.23
461.400.82
465.97-0.15
487.170.53
524.46-0.12
526.721.6-1
566.070.22
582.240.518
596.100.418
618.650.98
628.870.42
639.82-0.12
642.300.15
642.720.43
642.720.43
643.860.86
643.871.47
643.880.46
704.210.618
704.230.317
  1. 1.839 km NNE of Battle Ground, Washington, United States10-03 04:39
  2. 1.823 km ENE of West Side Highway, Washington, United States10-06 19:59
  3. 1.654 km NNE of Battle Ground, Washington, United States09-29 13:24
  4. 1.66 km ENE of Battle Ground, Washington, United States10-19 23:25
  5. 1.622 km ENE of West Side Highway, Washington, United States10-07 20:15
  6. 1.455 km NNE of Battle Ground, Washington, United States10-24 20:34
  7. 1.25 km ESE of Battle Ground, Washington, United States10-12 09:01
  8. 1.15 km ESE of Battle Ground, Washington, United States10-12 03:01
  9. 1.110 km NNE of Battle Ground, Washington, United States10-07 22:47
  10. 1.041 km NE of Battle Ground, Washington, United States10-05 01:11
  11. 0.94 km NE of Woodland, Washington, United States10-23 19:21
  12. 0.854 km NNE of Battle Ground, Washington, United States10-17 06:06
  13. 0.854 km NNE of Battle Ground, Washington, United States10-24 20:33
  14. 0.822 km ENE of West Side Highway, Washington, United States10-05 14:51
  15. 0.754 km NNE of Battle Ground, Washington, United States10-08 02:53
  16. 0.74 km E of Battle Ground, Washington, United States10-12 09:23
  17. 0.722 km ENE of West Side Highway, Washington, United States09-28 02:36
  18. 0.622 km ENE of West Side Highway, Washington, United States10-04 09:25
  19. 0.654 km NNE of Battle Ground, Washington, United States10-12 22:39
  20. 0.654 km NNE of Battle Ground, Washington, United States09-30 16:32
  21. 0.623 km ENE of West Side Highway, Washington, United States10-06 22:03
  22. 0.622 km ENE of West Side Highway, Washington, United States10-27 08:54
  23. 0.554 km NNE of Battle Ground, Washington, United States09-30 03:57
  24. 0.522 km ENE of West Side Highway, Washington, United States10-22 06:56
  25. 0.553 km NE of Woodland, Washington, United States10-18 07:52

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 uw714110702. First recorded here 28 Sept 2026, 21:52:10 UTC. Solutions: USGS · UW (usgs:uw714110702). Cite as: SeismoAtlas, “M1.4 earthquake 28 km ENE of Woodland, Washington, United States”, https://seismoatlas.com/earthquake/uw714110702-m1-4-earthquake-28-km-ene-of-woodland-washington-united-states, data from USGS.

JSON: /api/v1/events/uw714110702. SeismoAtlas is not an official warning service.