QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

14 km S of Snoqualmie Pass, Washington

· -0.4 km deep · released about 16 lb of TNT

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10 km30 km60 km120 km N King County 40 kmKittitas County 58 kmPierce County 61 kmChelan County 89 kmSnohomish County 92 kmKitsap County 102 kmYakima County 104 kmLewis County 105 kmThurston County 113 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
-0.4 km below the surface
Felt
no reports yet
Nearest
King County, 40 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 555 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 47.2653, -121.4168. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 40 km (25 mi) SE of here earthquakes near King County
Kittitas County, WA 58 km (36 mi) WNW of here earthquakes near Kittitas County
Pierce County, WA 61 km (38 mi) ENE of here earthquakes near Pierce County
Chelan County, WA 89 km (55 mi) SW of here earthquakes near Chelan County
Snohomish County, WA 92 km (57 mi) SSE of here earthquakes near Snohomish County
Kitsap County, WA 102 km (63 mi) ESE of here earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 1.6 6 km NE of Fall City, Washington
  2. 1.9 12 km W of Greenwater, Washington
  3. 1.5 14 km S of Skykomish, Washington
  4. 2.7 5 km NE of Fall City, Washington
  5. 1.9 12 km ENE of Enumclaw, Washington
  6. 1.6 5 km NE of Fall City, Washington
  7. 2.3 6 km NE of Fall City, Washington
  8. 1.6 5 km NE of Fall City, Washington
  9. 2.5 6 km NE of Fall City, Washington
  10. 1.7 6 km NE of Fall City, Washington
  11. 3.0 8 km ENE of Fall City, Washington
  12. 1.7 6 km NE of Fall City, Washington
  13. 3.4 9 km NNE of Snoqualmie, Washington
  14. 1.6 8 km S of Baring, Washington
  15. 1.8 1 km E 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.