QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km WSW of Federal Way, Washington

· 24 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 33 kmKitsap County 43 kmKing County 43 kmThurston County 56 kmMason County 63 kmLewis County 82 kmSnohomish County 93 kmIsland County 97 kmJefferson County 104 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 1.8 (ml)
Depth
24 km below the surface
Felt
1 report
Nearest
Pierce County, 33 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 529 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 47.3133, -122.3445. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pierce County, WA 33 km (20 mi) NNW of here earthquakes near Pierce County
Kitsap County, WA 43 km (27 mi) SSE of here earthquakes near Kitsap County
King County, WA 43 km (27 mi) WSW of here earthquakes near King County
Thurston County, WA 56 km (35 mi) NE of here earthquakes near Thurston County
Mason County, WA 63 km (39 mi) E of here earthquakes near Mason County
Lewis County, WA 82 km (51 mi) N of here earthquakes near Lewis County

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

Aftershocks so far

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

  1. 1.9 1 km NNW of Mirrormont, Washington
  2. 1.7 1 km SE of Shoreline, Washington
  3. 2.4 6 km SSW of Wilderness Rim, Washington
  4. 1.5 3 km NNW of Bryn Mawr-Skyway, Washington
  5. 1.7 3 km NNW of Bryn Mawr-Skyway, Washington
  6. 1.7 1 km SE of Kapowsin, Washington
  7. 2.0 3 km W of Gorst, Washington
  8. 2.2 2 km SE of Buckley, Washington
  9. 2.5 2 km SE of Buckley, Washington
  10. 1.8 2 km ESE of Buckley, Washington
  11. 1.5 1 km NE of Wilburton, Washington
  12. 1.7 0 km W of Beaux Arts Village, Washington
  13. 1.5 1 km WSW of Kapowsin, Washington
  14. 1.6 2 km NNE of Enetai, Washington
  15. 1.6 2 km W of Belfair, 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.