QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

7 km NE of Darrington, Washington

· 0.2 km deep · released about 650 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 28 kmSnohomish County 33 kmWhatcom County 63 kmChelan County 85 kmIsland County 85 kmKing County 94 kmKitsap County 111 kmSan Juan County 117 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
0.2 km below the surface
Felt
34 reports · strongest reported intensity IV
Nearest
Skagit County, 28 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1569 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 34 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 48.3130, -121.5428. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 28 km (18 mi) SE of here earthquakes near Skagit County
Snohomish County, WA 33 km (21 mi) NNE of here earthquakes near Snohomish County
Whatcom County, WA 63 km (39 mi) SSE of here earthquakes near Whatcom County
Chelan County, WA 85 km (53 mi) NW of here earthquakes near Chelan County
Island County, WA 85 km (53 mi) ENE of here earthquakes near Island County
King County, WA 94 km (58 mi) NNE of here earthquakes near King County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.7 1 km ESE of Oso, Washington
  2. 1.5 3 km E of Granite Falls, Washington
  3. 1.5 2 km ENE of Granite Falls, Washington
  4. 1.6 13 km ENE of Verlot, Washington
  5. 1.5 11 km NE of May Creek, Washington
  6. 1.8 2 km ENE of Granite Falls, Washington
  7. 1.7 9 km SW of Concrete, Washington
  8. 1.5 1 km E of Granite Falls, Washington
  9. 1.7 5 km NNE of Oso, Washington
  10. 1.6 10 km ESE of Hamilton, Washington
  11. 1.6 3 km NNW of Oso, Washington
  12. 1.6 Washington
  13. 1.6 3 km WNW of Lake Cavanaugh, Washington
  14. 1.6 2 km E of Granite Falls, Washington
  15. 1.7 15 km NE 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.