QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

10 km S of Snoqualmie Pass, Washington

· 6.3 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 40 kmKittitas County 56 kmPierce County 65 kmChelan County 84 kmSnohomish County 89 kmKitsap County 103 kmYakima County 106 kmLewis County 110 kmThurston County 117 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
6.3 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
King County, 40 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2894 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× 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 47.3013, -121.3778. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 40 km (25 mi) ESE of here earthquakes near King County
Kittitas County, WA 56 km (35 mi) WNW of here earthquakes near Kittitas County
Pierce County, WA 65 km (40 mi) ENE of here earthquakes near Pierce County
Chelan County, WA 84 km (52 mi) SW of here earthquakes near Chelan County
Snohomish County, WA 89 km (55 mi) SSE of here earthquakes near Snohomish County
Kitsap County, WA 103 km (64 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

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

  1. 1.7 13 km W of Greenwater, Washington
  2. 1.6 2 km E of Snoqualmie, Washington
  3. 1.9 7 km ENE of Fall City, Washington
  4. 1.6 3 km NW of Snoqualmie Pass, Washington
  5. 1.8 1 km S of Snoqualmie, Washington
  6. 2.2 8 km E of Carnation, Washington
  7. 1.6 5 km WSW of North Bend, Washington
  8. 1.7 12 km W of Greenwater, Washington
  9. 1.7 8 km SSW of Baring, Washington
  10. 2.0 14 km ENE of Tanner, Washington
  11. 1.6 6 km NE of Fall City, Washington
  12. 1.9 12 km W of Greenwater, Washington
  13. 1.5 14 km S of Skykomish, Washington
  14. 2.7 5 km NE of Fall City, Washington
  15. 1.9 12 km ENE 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.