QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6ml

2 km E of Mount Vernon, Washington

· 14 km deep · released about 3.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 37 kmIsland County 40 kmSnohomish County 57 kmWhatcom County 58 kmSan Juan County 60 kmKitsap County 91 kmKing County 110 kmJefferson County 114 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 3.6 (ml)
Depth
14 km below the surface
Felt
678 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Skagit County, 37 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 403 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 678 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 51,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,300× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,600× the energy of this one
  4. This earthquake M 3.6 about 3.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.9× more

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 48.4235, -122.3055. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 37 km (23 mi) WSW of here earthquakes near Skagit County
Island County, WA 40 km (25 mi) NE of here earthquakes near Island County
Snohomish County, WA 57 km (36 mi) NW of here earthquakes near Snohomish County
Whatcom County, WA 58 km (36 mi) SW of here earthquakes near Whatcom County
San Juan County, WA 60 km (37 mi) E of here earthquakes near San Juan County
Kitsap County, WA 91 km (56 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

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

  1. 1.7 15 km NE of Lake Cavanaugh, Washington
  2. 1.9 4 km SW of Big Lake, Washington
  3. 1.6 2 km E of Granite Falls, Washington
  4. 2.9 12 km NNE of Hamilton, Washington
  5. 1.6 10 km ESE of Orcas, Washington
  6. 1.9 6 km W of Lake Cavanaugh, Washington
  7. 2.0 15 km SSW of Concrete, Washington
  8. 1.6 2 km E of Granite Falls, Washington
  9. 2.0 14 km NE of Lake Cavanaugh, Washington
  10. 2.3 15 km NE of Lake Cavanaugh, Washington
  11. 1.6 4 km NNE of Oso, Washington
  12. 1.5 2 km ENE of Granite Falls, Washington
  13. 1.7 Washington
  14. 1.6 9 km NNE of Sedro-Woolley, Washington
  15. 3.1 6 km N of Camano, 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.