QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

5 km SW of Lake Cavanaugh, Washington

· 12 km deep · released about 590 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 29 kmSnohomish County 35 kmIsland County 47 kmWhatcom County 63 kmSan Juan County 80 kmKitsap County 85 kmKing County 91 kmChelan County 118 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 2.9 (ml)
Depth
12 km below the surface
Felt
31 reports · strongest reported intensity III
Nearest
Skagit County, 29 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2670 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 31 people have reported feeling it to USGS.

How big was it?

This earthquake released about 590 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 26,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 18,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.6× the energy of this one
  4. This earthquake M 2.9 about 590 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 48.2962, -122.0725. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 29 km (18 mi) SW of here earthquakes near Skagit County
Snohomish County, WA 35 km (22 mi) NW of here earthquakes near Snohomish County
Island County, WA 47 km (29 mi) ENE of here earthquakes near Island County
Whatcom County, WA 63 km (39 mi) SSW of here earthquakes near Whatcom County
San Juan County, WA 80 km (50 mi) ESE of here earthquakes near San Juan County
Kitsap County, WA 85 km (53 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

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

  1. 1.9 2 km ENE of Granite Falls, Washington
  2. 2.3 3 km SSW of Clinton, Washington
  3. 1.6 2 km E of Snohomish, Washington
  4. 1.9 3 km ENE of Granite Falls, Washington
  5. 1.8 5 km WSW of Darrington, Washington
  6. 1.8 6 km WSW of Clinton, Washington
  7. 2.6 6 km WSW of Clinton, Washington
  8. 2.2 8 km SW of Warm Beach, Washington
  9. 1.8 3 km E of Granite Falls, Washington
  10. 1.7 1 km NE of Granite Falls, Washington
  11. 2.0 3 km E of Granite Falls, Washington
  12. 1.6 5 km WSW of Darrington, Washington
  13. 1.7 5 km ENE of Anacortes, Washington
  14. 1.8 3 km SSW of Big Lake, Washington
  15. 2.1 3 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.