QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2ml

5 km E of Big Lake, Washington

· 18 km deep · released about 54 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 28 kmIsland County 46 kmSnohomish County 48 kmWhatcom County 55 kmSan Juan County 70 kmKitsap County 91 kmKing County 104 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 2.2 (ml)
Depth
18 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Skagit County, 28 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 568 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 54 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 280,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 200,000× the energy of this one
  3. Around the size people start to feel M 3.0 18× the energy of this one
  4. This earthquake M 2.2 about 54 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 48.3950, -122.1677. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 28 km (17 mi) WSW of here earthquakes near Skagit County
Island County, WA 46 km (28 mi) NE of here earthquakes near Island County
Snohomish County, WA 48 km (30 mi) NW of here earthquakes near Snohomish County
Whatcom County, WA 55 km (34 mi) SSW of here earthquakes near Whatcom County
San Juan County, WA 70 km (44 mi) E of here earthquakes near San Juan County
Kitsap County, WA 91 km (57 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

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

  1. 2.1 6 km NNW of La Conner, Washington
  2. 1.5 1 km NNW of Granite Falls, Washington
  3. 3.6 2 km E of Mount Vernon, Washington
  4. 1.9 1 km WNW of Mount Vernon, Washington
  5. 1.7 1 km ESE of Acme, Washington
  6. 1.6 2 km ENE of Granite Falls, Washington
  7. 2.0 4 km W of Lake Cavanaugh, Washington
  8. 1.7 1 km NNW of Silvana, Washington
  9. 1.6 2 km E of Granite Falls, Washington
  10. 1.8 2 km ENE of Granite Falls, Washington
  11. 2.0 8 km NE of Granite Falls, Washington
  12. 1.6 2 km ENE of Granite Falls, Washington
  13. 1.9 8 km ENE of Port Townsend, Washington
  14. 2.0 4 km SE of Swede Heaven, Washington
  15. 2.1 7 km W of Lake Cavanaugh, 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.