QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

0 km S of Boulevard Park, Washington

· 29 km deep · released about 450 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 31 kmKing County 36 kmPierce County 50 kmMason County 66 kmThurston County 72 kmSnohomish County 76 kmIsland County 80 kmJefferson County 98 kmLewis County 101 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 2.8 (ml)
Depth
29 km below the surface
Felt
356 reports · strongest reported intensity III
Measured shaking
intensity II (ShakeMap)
Nearest
Kitsap County, 31 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 567 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 356 people have reported feeling it to USGS.

How big was it?

This earthquake released about 450 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 34,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 24,000× 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 450 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 47.4833, -122.3140. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 31 km (19 mi) SE of here earthquakes near Kitsap County
King County, WA 36 km (22 mi) W of here earthquakes near King County
Pierce County, WA 50 km (31 mi) NNW of here earthquakes near Pierce County
Mason County, WA 66 km (41 mi) ENE of here earthquakes near Mason County
Thurston County, WA 72 km (45 mi) NNE of here earthquakes near Thurston County
Snohomish County, WA 76 km (47 mi) SSW of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 1.5 2 km WNW of Gig Harbor, Washington
  2. 1.6 6 km SW of Des Moines, Washington
  3. 1.5 5 km NNE of Duvall, Washington
  4. 1.9 1 km ESE of Esperance, Washington
  5. 2.2 1 km NNE of Cathcart, Washington
  6. 1.5 10 km ESE of Enumclaw, Washington
  7. 1.6 7 km WNW of Gorst, Washington
  8. 1.5 7 km ENE of Allyn, Washington
  9. 1.8 5 km N of Lofall, Washington
  10. 1.5 1 km E of Ames Lake, Washington
  11. 1.5 11 km ESE of Enumclaw, Washington
  12. 1.5 3 km NNE of White Center, Washington
  13. 1.7 1 km NNE of Enetai, Washington
  14. 1.7 0 km NNE of Navy Yard City, Washington
  15. 1.7 6 km NE of Snoqualmie, 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 4.6 on 2019-07-12 — it released about 500 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.