QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km SW of Sedro-Woolley, Washington

· 10 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 33 kmIsland County 48 kmWhatcom County 50 kmSnohomish County 61 kmSan Juan County 62 kmKitsap County 99 kmKing County 116 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
10 km below the surface
Felt
no reports yet
Nearest
Skagit County, 33 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 947 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× 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 48.4922, -122.2583. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 33 km (20 mi) W of here earthquakes near Skagit County
Island County, WA 48 km (30 mi) NE of here earthquakes near Island County
Whatcom County, WA 50 km (31 mi) SW of here earthquakes near Whatcom County
Snohomish County, WA 61 km (38 mi) NW of here earthquakes near Snohomish County
San Juan County, WA 62 km (39 mi) E of here earthquakes near San Juan County
Kitsap County, WA 99 km (62 mi) NNE of here earthquakes near Kitsap County

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

Aftershocks so far

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

  1. 1.8 7 km SW of Swede Heaven, Washington
  2. 1.7 4 km W of Mount Vernon, Washington
  3. 1.9 4 km W of Mount Vernon, Washington
  4. 2.8 4 km W of Mount Vernon, Washington
  5. 1.7 4 km WSW of Mount Vernon, Washington
  6. 2.6 4 km W of Mount Vernon, Washington
  7. 1.9 4 km W of Mount Vernon, Washington
  8. 1.7 8 km NNE of Sedro-Woolley, Washington
  9. 1.9 3 km W of Mount Vernon, Washington
  10. 2.9 3 km W of Mount Vernon, Washington
  11. 2.0 3 km S of Alger, Washington
  12. 1.7 4 km W of Mount Vernon, Washington
  13. 1.7 4 km WSW of Mount Vernon, Washington
  14. 2.1 4 km WSW of Ault Field, Washington
  15. 1.7 5 km WSW of Mount Vernon, 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.