QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

4 km SE of Black Diamond, Washington

· 13 km deep · released about 72 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 26 kmPierce County 29 kmKitsap County 66 kmThurston County 75 kmLewis County 83 kmSnohomish County 88 kmMason County 91 kmKittitas County 99 kmIsland County 112 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 2.3 (ml)
Depth
13 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
King County, 26 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1950 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 72 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 210,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 150,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 72 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 47.2747, -121.9658. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 26 km (16 mi) SSW of here earthquakes near King County
Pierce County, WA 29 km (18 mi) NNE of here earthquakes near Pierce County
Kitsap County, WA 66 km (41 mi) SE of here earthquakes near Kitsap County
Thurston County, WA 75 km (47 mi) ENE of here earthquakes near Thurston County
Lewis County, WA 83 km (52 mi) NNE of here earthquakes near Lewis County
Snohomish County, WA 88 km (55 mi) S of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 1.5 1 km E of Ames Lake, Washington
  2. 1.5 11 km ESE of Enumclaw, Washington
  3. 1.5 3 km NNE of White Center, Washington
  4. 1.7 6 km NE of Snoqualmie, Washington
  5. 1.7 5 km SW of Fall City, Washington
  6. 1.7 3 km E of Carnation, Washington
  7. 1.6 8 km NE of Tanner, Washington
  8. 2.3 14 km NNE of Ashford, Washington
  9. 1.8 14 km NNE of Ashford, Washington
  10. 1.8 2 km NE of Mirrormont, Washington
  11. 1.5 1 km SSW of Ravensdale, Washington
  12. 1.5 4 km SSE of Carbonado, Washington
  13. 1.5 4 km SSE of Carbonado, Washington
  14. 2.2 9 km NNE of Snoqualmie, Washington
  15. 1.9 13 km ESE of Enumclaw, 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.