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M1.3 earthquake 7 km SE of Manchester, Washington, United States

A magnitude 1.3 earthquake struck 7 km SE of Manchester, Washington, United States at 06:15 local time (13:15 UTC) on 20 Oct 2026, at a depth of 28 km, according to USGS.

Data: USGS · updated 2026-10-20 18:52 UTC · reviewed

Magnitude
1.3micro
local magnitude (Richter) (ml)
Depth
27.9 km
Status
Reviewed
Origin time
2026-10-20 13:15:19 UTC
Local: 20 Oct 2026, 06:15:19 (America/Los Angeles)
Epicentre
47.524° N, 122.474° 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
ManchesterWashington, United States · pop. 5,4137 kmINot felt
VashonWashington, United States · pop. 10,6248 kmINot felt
BurienWashington, United States · pop. 50,46711 kmINot felt
Bainbridge IslandWashington, United States · pop. 23,84012 kmINot felt
BremertonWashington, United States · pop. 39,52013 kmINot felt
SeattleWashington, United States · pop. 780,99514 kmINot felt
VictoriaBritish Columbia, Canada · pop. 289,625121 kmINot felt
SurreyBritish Columbia, Canada · pop. 568,322178 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 ml27.9 km47.52° N, 122.47° W–Reviewed

How big was it?

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

It released roughly the energy of 1 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 28 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 2.9× the energy of M1.0, and its waves are about 2× taller on a seismogram. Energy: 1 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

7 later earthquakes within 30 km; the largest was M2.2 1 day ago. 3 in the 7 days before. Aftershock rates usually fall off roughly in proportion to 1/time.

Aftershocks

Mainshock M1.3

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

Aftershocks
Time after mainshock (hours)MagnitudeDepth (km)
178.721.518
190.661.022
403.410.923
442.291.318
482.520.522
541.652.228
582.521.90
  1. 2.25 km N of Vashon, Washington, United States11-12 02:54
  2. 1.911 km SW of Silverdale, Washington, United States11-13 19:46
  3. 1.513 km W of Port Orchard, Washington, United States10-27 23:58
  4. 1.38 km WSW of Tracyton, Washington, United States11-07 23:32
  5. 1.07 km WNW of Federal Way, Washington, United States10-28 11:55
  6. 0.9Near Tracyton, Washington, United States11-06 08:39
  7. 0.511 km W of Port Orchard, Washington, United States11-09 15:46

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 uw714122312. First recorded here 20 Oct 2026, 18:56:08 UTC. Solutions: USGS · UW (usgs:uw714122312). Cite as: SeismoAtlas, “M1.3 earthquake 7 km SE of Manchester, Washington, United States”, https://seismoatlas.com/earthquake/uw714122312-m1-3-earthquake-7-km-se-of-manchester-washington-united-states, data from USGS.

JSON: /api/v1/events/uw714122312. SeismoAtlas is not an official warning service.