QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

15 km NE of Lake Cavanaugh, Washington

· -0.5 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 10 kmSnohomish County 40 kmWhatcom County 49 kmIsland County 66 kmSan Juan County 93 kmKing County 102 kmKitsap County 104 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
-0.5 km below the surface
Felt
no reports yet
Nearest
Skagit County, 10 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1136 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 9 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.7 about 9 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 48.4053, -121.8562. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 10 km (6 mi) SSW of here earthquakes near Skagit County
Snohomish County, WA 40 km (25 mi) N of here earthquakes near Snohomish County
Whatcom County, WA 49 km (30 mi) S of here earthquakes near Whatcom County
Island County, WA 66 km (41 mi) ENE of here earthquakes near Island County
San Juan County, WA 93 km (58 mi) E of here earthquakes near San Juan County
King County, WA 102 km (63 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

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

  1. 1.6 7 km NNE of Sedro-Woolley, Washington
  2. 1.5 3 km E of Granite Falls, Washington
  3. 1.6 17 km SSE of Glacier, Washington
  4. 1.5 15 km NNE of Hamilton, Washington
  5. 1.8 7 km SW of Swede Heaven, Washington
  6. 1.7 4 km W of Mount Vernon, Washington
  7. 1.9 4 km W of Mount Vernon, Washington
  8. 2.8 4 km W of Mount Vernon, Washington
  9. 1.7 4 km WSW of Mount Vernon, Washington
  10. 2.6 4 km W of Mount Vernon, Washington
  11. 1.9 4 km W of Mount Vernon, Washington
  12. 1.7 8 km NNE of Sedro-Woolley, Washington
  13. 2.0 1 km ENE of Granite Falls, Washington
  14. 1.9 3 km W of Mount Vernon, Washington
  15. 2.9 3 km W of Mount Vernon, 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.