QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

5 km S of Black Diamond, Washington

· 18 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Pierce County 25 kmKing County 29 kmKitsap County 64 kmThurston County 71 kmLewis County 80 kmMason County 88 kmSnohomish County 91 kmKittitas County 102 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 1.7 (ml)
Depth
18 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 948 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× the energy of this one
  4. This earthquake M 1.7 about 11 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 47.2578, -122.0133. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Pierce County, WA 25 km (16 mi) NNE of here earthquakes near Pierce County
King County, WA 29 km (18 mi) SSW of here earthquakes near King County
Kitsap County, WA 64 km (40 mi) SE of here earthquakes near Kitsap County
Thurston County, WA 71 km (44 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 88 km (55 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. 2.4 3 km E of Carbonado, Washington
  2. 2.6 11 km NE of Snoqualmie, Washington
  3. 1.7 8 km NE of Fall City, Washington
  4. 1.9 Washington
  5. 1.6 1 km SSE of Kapowsin, Washington
  6. 2.5 9 km NNE of Snoqualmie, Washington
  7. 1.5 2 km NNW of Federal Way, Washington
  8. 1.8 11 km ENE of Enumclaw, Washington
  9. 1.5 23 km ENE of Ashford, Washington
  10. 1.6 2 km SSE of Ames Lake, Washington
  11. 1.7 7 km NE of Fall City, Washington
  12. 2.7 16 km NE of Ashford, Washington
  13. 1.7 11 km E of Tanner, Washington
  14. 2.8 8 km ENE of Fall City, Washington
  15. 2.1 9 km NNE 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.