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M1.0 earthquake 54 km NNE of Battle Ground, Washington, United States

A magnitude 1.0 earthquake struck 54 km NNE of Battle Ground, Washington, United States at 04:43 local time (11:43 UTC) on 27 Sept 2026, at a depth of 3 km, according to USGS.

Data: USGS · updated 2026-09-28 18:16 UTC · reviewed

Magnitude
1.0micro
hand-picked magnitude (mh)
Depth
2.8 km
Status
Reviewed
Origin time
2026-09-27 11:43:32 UTC
Local: 27 Sept 2026, 04:43:32 (America/Los Angeles)
Epicentre
46.206° N, 122.192° 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
Battle GroundWashington, United States · pop. 19,40754 kmINot felt
WoodlandWashington, United States · pop. 5,84254 kmINot felt
LongviewWashington, United States · pop. 36,84858 kmINot felt
CamasWashington, United States · pop. 21,84670 kmINot felt
VancouverWashington, United States · pop. 196,44273 kmINot felt
GreshamOregon, United States · pop. 110,55381 kmINot felt
PortlandOregon, United States · pop. 652,50385 kmINot felt
SeattleWashington, United States · pop. 780,995157 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 Survey1.0 mh2.8 km46.21° N, 122.19° W–Reviewed

How big was it?

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

It released roughly the energy of 477 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 3 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

The same size.

Each square is the energy of one M1.0. Energy from log₁₀E = 1.5M + 4.8.

Aftershocks and nearby activity

67 later earthquakes within 30 km; the largest was M1.8 40 days ago. 6 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.0

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
12.981.416
49.681.63
64.230.52
72.94-0.55
76.100.23
76.820.61
96.270.22
103.850.01
104.240.31
116.550.52
136.941.81
160.840.53
161.061.04
181.461.010
182.21-0.09
184.60-0.26
189.340.12
189.710.11
219.800.13
240.060.12
249.770.13
250.110.617
250.840.21
255.160.73
269.790.13
285.400.312
285.41-0.112
291.270.312
292.940.32
321.220.011
340.680.12
353.300.23
367.26-0.22
367.900.13
368.26-0.12
369.230.215
370.26-0.03
370.940.61
375.970.17
379.230.13
388.740.53
394.610.39
409.450.43
426.080.43
426.760.26
429.900.43
449.130.43
456.250.52
466.150.41
471.510.53
471.890.23
474.380.82
478.94-0.15
500.140.53
537.44-0.12
579.040.22
598.841.711
609.070.418
638.360.59
641.840.42
652.80-0.12
655.270.15
655.690.43
655.700.43
656.830.86
656.851.47
656.860.46
  1. 1.839 km NNE of Battle Ground, Washington, United States10-03 04:39
  2. 1.755 km ENE of West Side Highway, Washington, United States10-22 10:34
  3. 1.654 km NNE of Battle Ground, Washington, United States09-29 13:24
  4. 1.455 km NNE of Battle Ground, Washington, United States10-24 20:34
  5. 1.428 km ENE of Woodland, Washington, United States09-28 00:42
  6. 1.056 km ENE of Kelso, Washington, United States10-04 04:47
  7. 1.041 km NE of Battle Ground, Washington, United States10-05 01:11
  8. 0.854 km NNE of Battle Ground, Washington, United States10-17 06:06
  9. 0.854 km NNE of Battle Ground, Washington, United States10-24 20:33
  10. 0.754 km NNE of Battle Ground, Washington, United States10-08 02:53
  11. 0.654 km NNE of Battle Ground, Washington, United States10-12 22:39
  12. 0.654 km NNE of Battle Ground, Washington, United States09-30 16:32
  13. 0.651 km ENE of West Side Highway, Washington, United States10-07 21:50
  14. 0.554 km NNE of Battle Ground, Washington, United States09-30 03:57
  15. 0.553 km NE of Woodland, Washington, United States10-18 07:52
  16. 0.560 km NNE of Battle Ground, Washington, United States10-24 02:04
  17. 0.554 km NNE of Battle Ground, Washington, United States10-02 08:16
  18. 0.554 km NNE of Battle Ground, Washington, United States10-13 16:28
  19. 0.554 km NNE of Battle Ground, Washington, United States10-16 11:58
  20. 0.554 km NNE of Battle Ground, Washington, United States10-04 04:34
  21. 0.554 km NNE of Battle Ground, Washington, United States10-17 03:14
  22. 0.454 km NNE of Battle Ground, Washington, United States10-16 21:52
  23. 0.432 km NNE of Battle Ground, Washington, United States10-22 20:47
  24. 0.454 km NNE of Battle Ground, Washington, United States10-24 19:25
  25. 0.454 km NNE of Battle Ground, Washington, United States10-24 05:34

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 uw714110402. First recorded here 28 Sept 2026, 18:32:13 UTC. Solutions: USGS · UW (usgs:uw714110402). Cite as: SeismoAtlas, “M1.0 earthquake 54 km NNE of Battle Ground, Washington, United States”, https://seismoatlas.com/earthquake/uw714110402-m1-0-earthquake-54-km-nne-of-battle-ground-washington-united-states, data from USGS.

JSON: /api/v1/events/uw714110402. SeismoAtlas is not an official warning service.