QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

13 km S of Concrete, Washington

· 13 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 10 kmSnohomish County 40 kmWhatcom County 48 kmIsland County 73 kmSan Juan County 100 kmKing County 103 kmChelan County 104 kmKitsap County 109 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
13 km below the surface
Felt
no reports yet
Nearest
Skagit County, 10 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 565 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 9.3 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 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 48.4138, -121.7567. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 10 km (6 mi) SSE of here earthquakes near Skagit County
Snohomish County, WA 40 km (25 mi) N of here earthquakes near Snohomish County
Whatcom County, WA 48 km (30 mi) S of here earthquakes near Whatcom County
Island County, WA 73 km (46 mi) ENE of here earthquakes near Island County
San Juan County, WA 100 km (62 mi) E of here earthquakes near San Juan County
King County, WA 103 km (64 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. 2.6 15 km NNE of Lyman, Washington
  2. 1.8 9 km NNE of Rockport, Washington
  3. 1.9 6 km S of Acme, Washington
  4. 1.7 1 km ESE of Oso, Washington
  5. 1.5 3 km E of Granite Falls, Washington
  6. 1.9 14 km ESE of Acme, Washington
  7. 1.8 14 km NNE of Lyman, Washington
  8. 1.5 2 km ENE of Granite Falls, Washington
  9. 1.6 13 km ENE of Verlot, Washington
  10. 1.8 2 km ENE of Granite Falls, Washington
  11. 1.7 9 km SW of Concrete, Washington
  12. 1.8 2 km SW of Sedro-Woolley, Washington
  13. 1.5 1 km E of Granite Falls, Washington
  14. 1.7 5 km NNE of Oso, Washington
  15. 1.6 10 km ESE of Hamilton, 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.