QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

Earthquake near Seabeck, WA

No earthquake was likely felt in Seabeck in the 24 hours to 3:43 am PST (11:43 UTC). The last one was M 4.2, 28 km (17 mi) SSE, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near Seabeck

This page: a magnitude 2.8 earthquake was recorded 3 km (2 mi) east-northeast of Seabeck, WA, at 6:28 pm PDT on 26 October 2017 (01:28 UTC), 18 km deep. 14 people have reported feeling it to USGS.

USGS: 2 km ENE of Seabeck, Washington

33 km (21 mi) W of Seattle, WA

6:28 pm PDT, Oct 26, 2017 · · 18 km deep · released about 460 lb of TNT

Every earthquake near Seabeck Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 11 kmMason County 44 kmIsland County 58 kmJefferson County 58 kmKing County 74 kmThurston County 79 kmPierce County 82 kmSnohomish County 89 kmClallam County 97 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
6:28 pm PDT on 26 October 2017 ()
Where
3 km (2 mi) east-northeast of Seabeck, WA · earthquakes near Seabeck
Magnitude
M 2.8 (ml)
Depth
18 km below the surface
Felt
14 reports · strongest reported intensity III
Measured shaking
intensity II (ShakeMap)
Nearest
Kitsap County, 11 km E
Nearest mapped fault
Seattle fault, 3 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3222 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 20 km (12 mi) from the epicentre. In Seabeck, 3 km away, the estimate is intensity II (weak). Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Silverdale 7 km, intensity II · Bremerton 15 km, intensity II · Poulsbo 15 km, intensity II · Enetai 16 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 23,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 460 lb of TNT

Energy from the Gutenberg–Richter relation (log10E = 1.5M + 4.8), rounded to two figures; bar length is magnitude, which is already a logarithm of energy. Magnitudes of past earthquakes from the USGS catalogue.

For this area

The largest earthquake within 50 km since 2016 was M 4.1 on 2017-02-23 — about 89 times the energy of this one.

Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:

  1. 6.7 1 km ENE of Dash Point, Washington · 46 km SE of this epicentre
  2. 6.1 Puget Sound region, Washington · 27 km S of this epicentre
  3. 5.8 Puget Sound area, Washington · 41 km SSW of this epicentre
  4. 5.3 Eastern Olympic Peninsula, Washington · 23 km NW of this epicentre
  5. 5.0 3 km WSW of Des Moines, Washington · 43 km SE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 47.6448, -122.7910. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kitsap County, WA 11 km (7 mi) E earthquakes near Kitsap County
Mason County, WA 44 km (27 mi) SW earthquakes near Mason County
Island County, WA 58 km (36 mi) N earthquakes near Island County
Jefferson County, WA 58 km (36 mi) WNW earthquakes near Jefferson County
King County, WA 74 km (46 mi) ESE earthquakes near King County
Thurston County, WA 79 km (49 mi) S earthquakes near Thurston County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

59 earthquakes have been recorded within 50 km since this one.

  1. 1.9 6 km SSE of Port Ludlow, Washington
  2. 2.0 1 km SE of Keyport, Washington
  3. 1.9 1 km WSW of Freeland, Washington
  4. 1.6 1 km ENE of Enetai, Washington
  5. 1.7 2 km NNE of Southworth, Washington
  6. 1.5 8 km SW of Grapeview, Washington
  7. 1.5 1 km SSE of Keyport, Washington
  8. 1.6 3 km SE of Gorst, Washington
  9. 2.3 1 km SE of Keyport, Washington
  10. 1.9 1 km ESE of Keyport, Washington
  11. 1.6 3 km NW of Suquamish, Washington
  12. 2.5 0 km ESE of Riverton, Washington
  13. 1.5 1 km N of Artondale, Washington
  14. 2.0 12 km WNW of Belfair, Washington
  15. 1.6 6 km NE of Lofall, Washington

Counted from the QuakeIndex database, which ingests the USGS feed every 30 seconds · as of . QuakeIndex does not forecast aftershocks. When USGS issues an operational aftershock forecast it appears on the USGS event page.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.