QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

8 km NNE of Snoqualmie, Washington

· 18 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 13 kmSnohomish County 51 kmKitsap County 66 kmPierce County 67 kmChelan County 91 kmIsland County 91 kmKittitas County 98 kmSkagit County 100 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 2.8 (ml)
Depth
18 km below the surface
Felt
64 reports · strongest reported intensity III
Nearest
King County, 13 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2535 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 64 people have reported feeling it to USGS.

How big was it?

This earthquake released about 400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 47.5987, -121.7745. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 13 km (8 mi) NNE of here earthquakes near King County
Snohomish County, WA 51 km (32 mi) S of here earthquakes near Snohomish County
Kitsap County, WA 66 km (41 mi) E of here earthquakes near Kitsap County
Pierce County, WA 67 km (42 mi) NNE of here earthquakes near Pierce County
Chelan County, WA 91 km (57 mi) WSW of here earthquakes near Chelan County
Island County, WA 91 km (57 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

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

  1. 1.6 3 km NW of Snoqualmie Pass, Washington
  2. 1.5 2 km SSW of Carnation, Washington
  3. 1.8 1 km S of Snoqualmie, Washington
  4. 1.8 2 km S of Monroe, Washington
  5. 2.0 2 km SE of Duvall, Washington
  6. 1.8 2 km ENE of Maple Valley, Washington
  7. 1.6 4 km E of Cathcart, Washington
  8. 2.2 8 km E of Carnation, Washington
  9. 3.2 3 km NNW of Lake Marcel-Stillwater, Washington
  10. 1.5 1 km NNW of Maple Valley, Washington
  11. 1.6 5 km WSW of North Bend, Washington
  12. 1.7 12 km W of Greenwater, Washington
  13. 1.6 3 km NE of Mirrormont, Washington
  14. 1.7 8 km SSW of Baring, Washington
  15. 1.9 3 km NW of Lake Marcel-Stillwater, 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 560 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.