QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1 km S of Snoqualmie, Washington

· 17 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 2 kmPierce County 57 kmSnohomish County 61 kmKitsap County 64 kmIsland County 96 kmKittitas County 97 kmChelan County 98 kmThurston County 99 kmMason County 103 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
17 km below the surface
Felt
no reports yet
Nearest
King County, 2 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2364 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 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× 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 47.5108, -121.8238. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 2 km (1 mi) NNE of here earthquakes near King County
Pierce County, WA 57 km (35 mi) NNE of here earthquakes near Pierce County
Snohomish County, WA 61 km (38 mi) S of here earthquakes near Snohomish County
Kitsap County, WA 64 km (40 mi) ESE of here earthquakes near Kitsap County
Island County, WA 96 km (60 mi) SE of here earthquakes near Island County
Kittitas County, WA 97 km (60 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

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

  1. 1.9 3 km SSE of Sultan, Washington
  2. 1.8 12 km W of Greenwater, Washington
  3. 1.7 1 km N of Kingsgate, Washington
  4. 1.9 11 km ESE of Enumclaw, Washington
  5. 2.0 2 km N of Lakeland South, Washington
  6. 1.9 5 km NNW of North Sultan, Washington
  7. 1.7 2 km SW of Carnation, Washington
  8. 2.1 11 km NNE of Tanner, Washington
  9. 1.5 1 km SSW of Ravensdale, Washington
  10. 2.0 2 km SSW of Ravensdale, Washington
  11. 1.5 5 km NNW of North Sultan, Washington
  12. 1.6 12 km W of Greenwater, Washington
  13. 1.9 4 km WSW of Lake Marcel-Stillwater, Washington
  14. 1.7 13 km W of Greenwater, Washington
  15. 2.2 3 km S of Duvall, 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 13,000 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.