QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Washington

· 14 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 14 kmSnohomish County 50 kmKitsap County 68 kmPierce County 69 kmChelan County 89 kmIsland County 93 kmKittitas County 96 kmSkagit County 99 kmThurston County 111 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
14 km below the surface
Felt
3 reports · strongest reported intensity III
Nearest
King County, 14 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3401 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 17 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 47.6015, -121.7387. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 14 km (9 mi) NNE of here earthquakes near King County
Snohomish County, WA 50 km (31 mi) S of here earthquakes near Snohomish County
Kitsap County, WA 68 km (43 mi) E of here earthquakes near Kitsap County
Pierce County, WA 69 km (43 mi) NNE of here earthquakes near Pierce County
Chelan County, WA 89 km (55 mi) WSW of here earthquakes near Chelan County
Island County, WA 93 km (58 mi) SE of here earthquakes near Island County

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

Aftershocks so far

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

  1. 1.6 12 km W of Greenwater, Washington
  2. 2.6 6 km SSW of Lake Morton-Berrydale, Washington
  3. 2.1 5 km SE of Lea Hill, Washington
  4. 1.7 6 km ENE of Hobart, Washington
  5. 1.5 13 km ESE of Enumclaw, Washington
  6. 1.8 8 km NE of Lake Marcel-Stillwater, Washington
  7. 1.8 10 km NNE of Lake Marcel-Stillwater, Washington
  8. 1.7 12 km W of Greenwater, Washington
  9. 1.6 6 km ESE of Hobart, Washington
  10. 1.6 12 km ESE of Enumclaw, Washington
  11. 1.7 3 km W of Redmond, Washington
  12. 1.6 3 km W of Redmond, Washington
  13. 1.7 3 km SE of Duvall, Washington
  14. 1.6 2 km S of West Lake Sammamish, Washington
  15. 2.7 4 km WSW of Mercer Island, 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.