QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

9 km ENE of Snoqualmie, Washington

· 18 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 12 kmSnohomish County 55 kmPierce County 66 kmKitsap County 71 kmChelan County 88 kmKittitas County 92 kmIsland County 97 kmSkagit County 104 kmThurston County 109 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
King County, 12 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 521 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 9 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.7 about 9 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 47.5628, -121.7123. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 12 km (8 mi) NE of here earthquakes near King County
Snohomish County, WA 55 km (34 mi) S of here earthquakes near Snohomish County
Pierce County, WA 66 km (41 mi) NNE of here earthquakes near Pierce County
Kitsap County, WA 71 km (44 mi) E of here earthquakes near Kitsap County
Chelan County, WA 88 km (55 mi) WSW of here earthquakes near Chelan County
Kittitas County, WA 92 km (57 mi) WNW of here earthquakes near Kittitas County

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

Aftershocks so far

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

  1. 1.7 7 km NE of Fall City, Washington
  2. 1.6 8 km ENE of Duvall, Washington
  3. 1.6 4 km S of Monroe, Washington
  4. 1.6 3 km NE of Lake Marcel-Stillwater, Washington
  5. 1.8 4 km NE of Woods Creek, Washington
  6. 2.0 1 km SE of Fairwood, Washington
  7. 1.7 3 km E of Mirrormont, Washington
  8. 1.7 5 km NE of Hobart, Washington
  9. 2.2 5 km E of Mirrormont, Washington
  10. 1.7 6 km NNW of North Sultan, Washington
  11. 1.6 9 km NNE of Snoqualmie, Washington
  12. 2.4 10 km NE of Snoqualmie, Washington
  13. 2.0 2 km ENE of Snoqualmie, Washington
  14. 2.0 3 km S of Monroe, Washington
  15. 2.1 7 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2019-07-12 — it released about 25,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

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