QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

15 km NE of Lake Cavanaugh, Washington

· 3.6 km deep · released about 98 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 10 kmSnohomish County 40 kmWhatcom County 49 kmIsland County 67 kmSan Juan County 93 kmKing County 102 kmKitsap County 104 kmChelan County 110 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 2.3 (ml)
Depth
3.6 km below the surface
Felt
no reports yet
Nearest
Skagit County, 10 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 564 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 98 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.8× the energy of this one
  4. This earthquake M 2.3 about 98 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 48.4065, -121.8517. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 10 km (6 mi) SSW of here earthquakes near Skagit County
Snohomish County, WA 40 km (25 mi) N of here earthquakes near Snohomish County
Whatcom County, WA 49 km (30 mi) S of here earthquakes near Whatcom County
Island County, WA 67 km (41 mi) ENE of here earthquakes near Island County
San Juan County, WA 93 km (58 mi) E of here earthquakes near San Juan County
King County, WA 102 km (63 mi) N of here earthquakes near King 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 4 km WSW of Mount Vernon, Washington
  2. 2.6 4 km W of Mount Vernon, Washington
  3. 1.9 4 km W of Mount Vernon, Washington
  4. 1.7 8 km NNE of Sedro-Woolley, Washington
  5. 2.0 1 km ENE of Granite Falls, Washington
  6. 1.9 3 km W of Mount Vernon, Washington
  7. 2.9 3 km W of Mount Vernon, Washington
  8. 2.0 3 km S of Alger, Washington
  9. 1.7 4 km W of Mount Vernon, Washington
  10. 1.7 4 km WSW of Mount Vernon, Washington
  11. 1.6 2 km E of Granite Falls, Washington
  12. 1.7 5 km WSW of Mount Vernon, Washington
  13. 2.4 4 km W of Mount Vernon, Washington
  14. 1.6 4 km WSW of Darrington, Washington
  15. 1.7 2 km ENE of Granite Falls, 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.