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SeismoAtlas

M1.6 earthquake 11 km W of Maplewood, Washington, United States

A magnitude 1.6 earthquake struck 11 km W of Maplewood, Washington, United States at 07:30 local time (14:30 UTC) on 30 Sept 2026, at a depth of 27 km, according to USGS.

Data: USGS · updated 2026-09-30 17:48 UTC · reviewed

Magnitude
1.6micro
local magnitude (Richter) (ml)
Depth
27.5 km
Status
Reviewed
Origin time
2026-09-30 14:30:51 UTC
Local: 30 Sept 2026, 07:30:51 (America/Los Angeles)
Epicentre
47.410° N, 122.701° 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
MaplewoodWashington, United States · pop. 5,13811 kmINot felt
Gig HarborWashington, United States · pop. 8,75313 kmINot felt
BremertonWashington, United States · pop. 39,52019 kmINot felt
University PlaceWashington, United States · pop. 32,84222 kmINot felt
TacomaWashington, United States · pop. 222,90627 kmINot felt
BurienWashington, United States · pop. 50,46727 kmINot felt
SeattleWashington, United States · pop. 780,99536 kmINot felt
VictoriaBritish Columbia, Canada · pop. 289,625124 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 Survey1.6 ml27.5 km47.41° N, 122.70° W–Reviewed

How big was it?

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

It released roughly the energy of 4 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 27 km this was a shallow earthquake, which is felt more strongly at the surface than a deeper one of the same size.

M1.6 releases about 8.5× the energy of M1.0, and its waves are about 4.2× taller on a seismogram. Energy: 4 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

20 later earthquakes within 30 km; the largest was M2.0 38 days ago. 5 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.6

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
23.801.327
37.971.02
127.230.619
138.091.825
143.812.023
144.830.922
153.682.024
154.811.124
240.301.331
255.510.714
257.710.813
260.301.113
296.280.923
341.330.713
342.591.930
368.320.619
478.741.328
653.420.4-1
657.461.518
669.411.022
  1. 2.0Near Tracyton, Washington, United States10-07 00:11
  2. 2.0Near Tracyton, Washington, United States10-06 14:19
  3. 1.917 km WSW of East Port Orchard, Washington, United States10-14 21:06
  4. 1.8Near Tracyton, Washington, United States10-06 08:36
  5. 1.513 km W of Port Orchard, Washington, United States10-27 23:58
  6. 1.37 km SE of Manchester, Washington, United States10-20 13:15
  7. 1.311 km W of Maplewood, Washington, United States10-01 14:18
  8. 1.37 km ESE of Bainbridge Island, Washington, United States10-10 14:48
  9. 1.17 km SW of Silverdale, Washington, United States10-11 10:48
  10. 1.13 km E of Tracyton, Washington, United States10-07 01:19
  11. 1.07 km WNW of Federal Way, Washington, United States10-28 11:55
  12. 1.03 km SE of East Port Orchard, Washington, United States10-02 04:28
  13. 0.99 km SW of Artondale, Washington, United States10-12 22:47
  14. 0.94 km E of Tracyton, Washington, United States10-06 15:20
  15. 0.85 km WSW of Tracyton, Washington, United States10-11 08:13
  16. 0.76 km WSW of Tracyton, Washington, United States10-11 06:01
  17. 0.74 km W of Tracyton, Washington, United States10-14 19:50
  18. 0.64 km SSW of Bainbridge Island, Washington, United States10-15 22:50
  19. 0.622 km WSW of Silverdale, Washington, United States10-05 21:44
  20. 0.424 km NNE of Shelton, Washington, United States10-27 19:56

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 uw714112362. First recorded here 30 Sept 2026, 17:52:37 UTC. Solutions: USGS · UW (usgs:uw714112362). Cite as: SeismoAtlas, “M1.6 earthquake 11 km W of Maplewood, Washington, United States”, https://seismoatlas.com/earthquake/uw714112362-m1-6-earthquake-11-km-w-of-maplewood-washington-united-states, data from USGS.

JSON: /api/v1/events/uw714112362. SeismoAtlas is not an official warning service.