QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1 km NNW of Maple Valley, Washington

· 16 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 19 kmPierce County 40 kmKitsap County 52 kmSnohomish County 76 kmThurston County 78 kmMason County 84 kmLewis County 95 kmIsland County 96 kmKittitas County 109 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
16 km below the surface
Felt
no reports yet
Nearest
King County, 19 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 495 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 47.4033, -122.0558. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 19 km (12 mi) WSW of here earthquakes near King County
Pierce County, WA 40 km (25 mi) N of here earthquakes near Pierce County
Kitsap County, WA 52 km (32 mi) ESE of here earthquakes near Kitsap County
Snohomish County, WA 76 km (47 mi) SSW of here earthquakes near Snohomish County
Thurston County, WA 78 km (49 mi) NE of here earthquakes near Thurston County
Mason County, WA 84 km (52 mi) E of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 1.6 4 km E of Carnation, Washington
  2. 1.6 1 km E of Clyde Hill, Washington
  3. 1.7 11 km NNE of Snoqualmie, Washington
  4. 1.5 0 km ESE of Browns Point, Washington
  5. 1.6 2 km E of Enetai, Washington
  6. 2.6 1 km ENE of Enetai, Washington
  7. 3.0 2 km NNW of Ames Lake, Washington
  8. 1.7 2 km E of Yarrow Point, Washington
  9. 1.6 8 km SE of Enumclaw, Washington
  10. 1.8 2 km W of Bainbridge Island, Washington
  11. 1.5 4 km NE of Dash Point, Washington
  12. 1.9 1 km NNW of Mirrormont, Washington
  13. 1.7 1 km SE of Shoreline, Washington
  14. 2.4 6 km SSW of Wilderness Rim, Washington
  15. 1.7 1 km S of Wilderness Rim, 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.