QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

5 km SW of Black Diamond, Washington

· 22 km deep · released about 41 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 25 kmKing County 30 kmKitsap County 61 kmThurston County 70 kmLewis County 80 kmMason County 85 kmSnohomish County 90 kmKittitas County 105 kmIsland County 110 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 2.1 (ml)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Pierce County, 25 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 566 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 41 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 370,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 260,000× the energy of this one
  3. Around the size people start to feel M 3.0 23× the energy of this one
  4. This earthquake M 2.1 about 41 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 47.2658, -122.0475. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pierce County, WA 25 km (16 mi) NNE of here earthquakes near Pierce County
King County, WA 30 km (18 mi) SSW of here earthquakes near King County
Kitsap County, WA 61 km (38 mi) SE of here earthquakes near Kitsap County
Thurston County, WA 70 km (43 mi) ENE of here earthquakes near Thurston County
Lewis County, WA 80 km (50 mi) NNE of here earthquakes near Lewis County
Mason County, WA 85 km (53 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

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

  1. 3.9 9 km NNE of Snoqualmie, Washington
  2. 1.6 7 km NE of Fall City, Washington
  3. 1.6 11 km ESE of Enumclaw, Washington
  4. 2.7 1 km NW of Maple Valley, Washington
  5. 1.6 1 km WSW of Seattle, Washington
  6. 1.6 18 km NNE of Ashford, Washington
  7. 1.9 3 km NNE of White Center, Washington
  8. 2.4 21 km NE of Ashford, Washington
  9. 1.7 6 km ESE of Tanner, Washington
  10. 1.5 0 km WNW of Pacific, Washington
  11. 1.8 1 km ESE of Union Hill-Novelty Hill, Washington
  12. 1.6 0 km NNE of Lake Marcel-Stillwater, Washington
  13. 1.6 0 km N of Lake Marcel-Stillwater, Washington
  14. 1.6 11 km W of Greenwater, Washington
  15. 2.0 3 km N of White Center, 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.