QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

Earthquake near Bremerton, WA

No earthquake was likely felt in Bremerton in the 24 hours to 9:29 am PST (17:29 UTC). The last one was M 4.2, 20 km (12 mi) SSW, at 2:05 pm PDT on 29 September 2026, estimated intensity III (weak) in town; 9,329 felt reports to USGS. Every earthquake near Bremerton

This page: a magnitude 3.0 earthquake was recorded 6 km (4 mi) southwest of Bremerton, WA, at 6:29 pm PDT on 27 October 2023 (01:29 UTC), 22 km deep. 334 people have reported feeling it to USGS.

USGS: 1 km NE of Gorst, Washington

28 km (17 mi) WSW of Seattle, WA · 27 km (17 mi) WNW of Burien, WA

6:29 pm PDT, Oct 27, 2023 · · 22 km deep · released about 990 lb of TNT

Every earthquake near Bremerton Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 12 kmMason County 41 kmKing County 65 kmThurston County 67 kmPierce County 67 kmJefferson County 69 kmIsland County 69 kmSnohomish County 90 kmGrays Harbor 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
6:29 pm PDT on 27 October 2023 ()
Where
6 km (4 mi) southwest of Bremerton, WA · earthquakes near Bremerton
Magnitude
M 3.0 (ml)
Depth
22 km below the surface
Felt
334 reports · strongest reported intensity V
Measured shaking
intensity III (ShakeMap)
Nearest
Kitsap County, 12 km NNE
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 1044 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 30 km (19 mi) from the epicentre. In Bremerton, 6 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: Bremerton 6 km, intensity II · Enetai 9 km, intensity II · Poulsbo 23 km, intensity II · Artondale 27 km, intensity II · Burien 27 km, intensity II · Seattle 28 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 42 times the energy of this one.

Before 2016, the USGS record lists 6 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.8 The 2001 Nisqually, Washington Earthquake · 43 km S of this epicentre
  2. 6.7 1 km ENE of Dash Point, Washington · 32 km SE of this epicentre
  3. 6.1 Puget Sound region, Washington · 15 km SSW of this epicentre
  4. 5.8 Puget Sound area, Washington · 32 km SSW of this epicentre
  5. 5.3 Eastern Olympic Peninsula, Washington · 37 km NW 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 47.5342, -122.6958. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Kitsap County, WA 12 km (8 mi) NNE earthquakes near Kitsap County
Mason County, WA 41 km (26 mi) WSW earthquakes near Mason County
King County, WA 65 km (40 mi) E earthquakes near King County
Thurston County, WA 67 km (42 mi) S earthquakes near Thurston County
Pierce County, WA 67 km (42 mi) SE earthquakes near Pierce County
Jefferson County, WA 69 km (43 mi) WNW earthquakes near Jefferson County

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

Aftershocks so far

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

  1. 1.7 1 km NE of White Center, Washington
  2. 1.8 1 km E of Enetai, Washington
  3. 2.2 3 km SW of Redmond, Washington
  4. 1.7 2 km NW of Manchester, Washington
  5. 2.5 4 km WSW of Artondale, Washington
  6. 2.0 6 km WNW of Lofall, Washington
  7. 1.7 5 km SW of Port Ludlow, Washington
  8. 1.7 10 km S of Seabeck, Washington
  9. 2.6 7 km WNW of Lofall, Washington
  10. 2.3 0 km ESE of Waller, Washington
  11. 1.9 6 km ENE of Lofall, Washington
  12. 2.2 8 km ENE of Quilcene, Washington
  13. 1.5 2 km N of Edmonds, Washington
  14. 1.6 3 km WNW of Shoreline, Washington
  15. 1.9 8 km WNW of Shelton, 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.