QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

0 km NW of Keyport, Washington

· 25 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 8 kmIsland County 50 kmMason County 57 kmKing County 64 kmJefferson County 68 kmSnohomish County 75 kmPierce County 81 kmThurston County 87 kmSan Juan County 96 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
Magnitude
M 2.9 (ml)
Depth
25 km below the surface
Felt
128 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Kitsap County, 8 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 345 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 128 people have reported feeling it to USGS.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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.

Where

Epicentre 47.7055, -122.6267. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 8 km (5 mi) NNE of here earthquakes near Kitsap County
Island County, WA 50 km (31 mi) S of here earthquakes near Island County
Mason County, WA 57 km (35 mi) NE of here earthquakes near Mason County
King County, WA 64 km (40 mi) WNW of here earthquakes near King County
Jefferson County, WA 68 km (42 mi) E of here earthquakes near Jefferson County
Snohomish County, WA 75 km (47 mi) WSW of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 1.5 11 km N of Hoodsport, Washington
  2. 1.8 1 km S of Shoreline, Washington
  3. 2.4 3 km ENE of Belfair, Washington
  4. 1.6 2 km W of Port Townsend, Washington
  5. 1.9 1 km WSW of Manchester, Washington
  6. 2.0 6 km SW of Clinton, Washington
  7. 2.9 2 km W of Home, Washington
  8. 1.5 4 km NW of Tulalip Bay, Washington
  9. 2.0 8 km W of Gorst, Washington
  10. 1.6 2 km SSW of Clinton, Washington
  11. 1.9 0 km SE of Enetai, Washington
  12. 1.7 3 km SSW of Clinton, Washington
  13. 2.0 3 km SSW of Clinton, Washington
  14. 1.6 1 km E of Clyde Hill, Washington
  15. 1.6 3 km W of Quilcene, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2023-10-09 — it released about 120 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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