QuakeIndex

explosion · reviewed by a seismologist

M 1.6md

3 km NW of Snoqualmie Pass, Washington

· -1.8 km deep · released about 8.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 32 kmKittitas County 65 kmPierce County 68 kmSnohomish County 76 kmChelan County 78 kmKitsap County 95 kmLewis County 118 kmYakima County 118 kmThurston County 119 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 1.6 (md)
Depth
-1.8 km below the surface
Felt
no reports yet
Nearest
King County, 32 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2335 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 47.4137, -121.4247. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 32 km (20 mi) ESE of here earthquakes near King County
Kittitas County, WA 65 km (40 mi) WNW of here earthquakes near Kittitas County
Pierce County, WA 68 km (42 mi) NE of here earthquakes near Pierce County
Snohomish County, WA 76 km (47 mi) SSE of here earthquakes near Snohomish County
Chelan County, WA 78 km (49 mi) SW of here earthquakes near Chelan County
Kitsap County, WA 95 km (59 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

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

  1. 1.6 13 km ESE of Enumclaw, Washington
  2. 1.6 10 km NNE of Snoqualmie, Washington
  3. 1.7 17 km NNE of Snoqualmie Pass, Washington
  4. 1.8 1 km SW of Snoqualmie, Washington
  5. 1.5 11 km ESE of Enumclaw, Washington
  6. 2.2 1 km NNE of Carnation, Washington
  7. 1.8 12 km W of Greenwater, Washington
  8. 1.9 2 km SE of Ravensdale, Washington
  9. 2.2 2 km SSE of Carnation, Washington
  10. 1.9 13 km S of May Creek, Washington
  11. 1.5 1 km SSW of Carnation, Washington
  12. 1.5 13 km W of Greenwater, Washington
  13. 1.6 4 km SSW of May Creek, Washington
  14. 1.5 3 km NE of Fall City, Washington
  15. 2.4 11 km E of Tanner, 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.