QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

8 km ENE of Lake Cavanaugh, Washington

· -0.4 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 18 kmSnohomish County 34 kmWhatcom County 55 kmIsland County 60 kmSan Juan County 90 kmKing County 95 kmKitsap County 96 kmChelan County 110 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 1.7 (ml)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Skagit County, 18 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2797 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 48.3467, -121.9137. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 18 km (11 mi) SSW of here earthquakes near Skagit County
Snohomish County, WA 34 km (21 mi) NNW of here earthquakes near Snohomish County
Whatcom County, WA 55 km (34 mi) S of here earthquakes near Whatcom County
Island County, WA 60 km (37 mi) ENE of here earthquakes near Island County
San Juan County, WA 90 km (56 mi) E of here earthquakes near San Juan County
King County, WA 95 km (59 mi) N 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. 1.5 11 km S of Darrington, Washington
  2. 2.0 11 km S of Darrington, Washington
  3. 1.5 2 km ENE of Granite Falls, Washington
  4. 1.9 1 km W of Swede Heaven, Washington
  5. 1.7 2 km W of Swede Heaven, Washington
  6. 1.7 4 km E of Granite Falls, Washington
  7. 1.5 Washington
  8. 1.8 13 km ENE of Verlot, Washington
  9. 2.0 4 km E of Oso, Washington
  10. 1.6 0 km ESE of Granite Falls, Washington
  11. 1.7 10 km N of Hamilton, Washington
  12. 1.8 11 km SSW of Darrington, Washington
  13. 1.6 3 km E of Granite Falls, Washington
  14. 1.9 9 km NNW of Marblemount, Washington
  15. 1.8 3 km E 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.