QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

10 km SW of Swede Heaven, Washington

· 14 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 18 kmSkagit County 31 kmIsland County 64 kmWhatcom County 70 kmKing County 80 kmKitsap County 89 kmChelan County 97 kmSan Juan County 101 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 2.1 (ml)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 18 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 554 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 43 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 43 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 48.2120, -121.8138. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 18 km (11 mi) NNW of here earthquakes near Snohomish County
Skagit County, WA 31 km (19 mi) S of here earthquakes near Skagit County
Island County, WA 64 km (40 mi) E of here earthquakes near Island County
Whatcom County, WA 70 km (44 mi) S of here earthquakes near Whatcom County
King County, WA 80 km (50 mi) N of here earthquakes near King County
Kitsap County, WA 89 km (55 mi) NE of here earthquakes near Kitsap 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. 1.6 3 km ENE of Cathcart, Washington
  2. 1.7 2 km ENE of Granite Falls, Washington
  3. 1.8 3 km E of Cathcart, Washington
  4. 1.6 4 km ENE of Cathcart, Washington
  5. 1.6 4 km SSW of Roosevelt, Washington
  6. 3.0 4 km ENE of Cathcart, Washington
  7. 1.7 4 km ENE of Cathcart, Washington
  8. 2.4 4 km SSW of Roosevelt, Washington
  9. 1.9 4 km SSW of Roosevelt, Washington
  10. 2.5 3 km W of Monroe, Washington
  11. 1.6 3 km ENE of Cathcart, Washington
  12. 2.3 4 km SSW of Roosevelt, Washington
  13. 1.6 4 km E of Cathcart, Washington
  14. 2.0 4 km E of Cathcart, Washington
  15. 1.8 3 km SSW of Roosevelt, 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.