QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

3 km NW of Cottage Lake, Washington

· 29 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 37 kmSnohomish County 41 kmKitsap County 42 kmIsland County 60 kmPierce County 80 kmSkagit County 84 kmMason County 92 kmJefferson County 106 kmThurston County 107 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
29 km below the surface
Felt
no reports yet
Nearest
King County, 37 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3193 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 47.7668, -122.1157. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 37 km (23 mi) NW of here earthquakes near King County
Snohomish County, WA 41 km (26 mi) SW of here earthquakes near Snohomish County
Kitsap County, WA 42 km (26 mi) ENE of here earthquakes near Kitsap County
Island County, WA 60 km (37 mi) SE of here earthquakes near Island County
Pierce County, WA 80 km (49 mi) N of here earthquakes near Pierce County
Skagit County, WA 84 km (52 mi) SSW of here earthquakes near Skagit 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 2 km NNE of Southworth, Washington
  2. 2.0 2 km NE of Granite Falls, Washington
  3. 1.5 1 km SSE of Keyport, Washington
  4. 2.3 1 km SE of Keyport, Washington
  5. 2.4 5 km SSE of May Creek, Washington
  6. 1.9 1 km ESE of Keyport, Washington
  7. 1.6 3 km NW of Suquamish, Washington
  8. 2.5 0 km ESE of Riverton, Washington
  9. 1.6 6 km NE of Lofall, Washington
  10. 2.0 3 km E of Granite Falls, Washington
  11. 1.6 3 km SE of Warm Beach, Washington
  12. 1.7 4 km N of Weallup Lake, Washington
  13. 1.7 6 km ENE of Hobart, Washington
  14. 1.8 3 km ENE of Granite Falls, Washington
  15. 1.8 8 km NE 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.

On USGS

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