QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

7 km NW of La Conner, Washington

· 5.6 km deep · released about 650 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 32 kmSan Juan County 40 kmSkagit County 56 kmWhatcom County 70 kmSnohomish County 73 kmKitsap County 89 kmJefferson County 100 kmClallam County 104 kmKing County 119 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
5.6 km below the surface
Felt
50 reports · strongest reported intensity IV
Nearest
Island County, 32 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2807 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 50 people have reported feeling it to USGS.

How big was it?

This earthquake released about 650 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 23,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 650 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 48.4370, -122.5672. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 32 km (20 mi) NNE of here earthquakes near Island County
San Juan County, WA 40 km (25 mi) E of here earthquakes near San Juan County
Skagit County, WA 56 km (35 mi) W of here earthquakes near Skagit County
Whatcom County, WA 70 km (44 mi) SW of here earthquakes near Whatcom County
Snohomish County, WA 73 km (45 mi) NW of here earthquakes near Snohomish County
Kitsap County, WA 89 km (55 mi) N of here earthquakes near Kitsap 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. 1.5 7 km W of Orcas, Washington
  2. 2.6 9 km NW of Friday Harbor, Washington
  3. 1.8 4 km NW of Orcas, Washington
  4. 2.2 8 km SW of Warm Beach, Washington
  5. 1.8 17 km WNW of Coupeville, Washington
  6. 1.7 10 km SE of Friday Harbor, Washington
  7. 2.2 15 km SSE of Friday Harbor, Washington
  8. 1.9 4 km E of Sudden Valley, Washington
  9. 2.2 12 km WNW of Ault Field, Washington
  10. 2.3 12 km NW of Ault Field, Washington
  11. 2.2 12 km WNW of Ault Field, Washington
  12. 1.7 12 km NW of Ault Field, Washington
  13. 1.7 5 km ENE of Anacortes, Washington
  14. 1.8 3 km SSW of Big Lake, Washington
  15. 1.8 9 km NNW of Freeland, 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.