QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

6 km NNW of Swede Heaven, Washington

· 0.8 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 18 kmSnohomish County 31 kmWhatcom County 57 kmIsland County 70 kmKing County 94 kmChelan County 100 kmSan Juan County 101 kmKitsap County 102 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 1.5 (ml)
Depth
0.8 km below the surface
Felt
no reports yet
Nearest
Skagit County, 18 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3127 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 48.3355, -121.7585. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 18 km (11 mi) SSE of here earthquakes near Skagit County
Snohomish County, WA 31 km (19 mi) N of here earthquakes near Snohomish County
Whatcom County, WA 57 km (35 mi) S of here earthquakes near Whatcom County
Island County, WA 70 km (44 mi) ENE of here earthquakes near Island County
King County, WA 94 km (58 mi) N of here earthquakes near King County
Chelan County, WA 100 km (62 mi) WNW of here earthquakes near Chelan County

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

Aftershocks so far

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

  1. 1.8 3 km E of Granite Falls, Washington
  2. 2.0 27 km E of Darrington, Washington
  3. 1.7 1 km NE of Granite Falls, Washington
  4. 2.0 3 km E of Granite Falls, Washington
  5. 1.6 5 km WSW of Darrington, Washington
  6. 1.8 3 km SSW of Big Lake, Washington
  7. 2.1 3 km ENE of Granite Falls, Washington
  8. 1.7 2 km ENE of Granite Falls, Washington
  9. 2.0 3 km ENE of Granite Falls, Washington
  10. 1.7 3 km SSW of Big Lake, Washington
  11. 2.0 4 km WNW of Lyman, Washington
  12. 1.5 4 km E of Riverside, Washington
  13. 1.9 3 km E of Granite Falls, Washington
  14. 1.6 3 km ENE of Granite Falls, Washington
  15. 1.8 3 km ENE 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.