QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

8 km NNW of Swede Heaven, Washington

· 4.7 km deep · released about 390 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 16 kmSnohomish County 33 kmWhatcom County 55 kmIsland County 71 kmKing County 96 kmSan Juan County 100 kmChelan County 101 kmKitsap County 103 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 2.7 (ml)
Depth
4.7 km below the surface
Felt
34 reports · strongest reported intensity V
Nearest
Skagit County, 16 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 487 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 34 people have reported feeling it to USGS.

How big was it?

This earthquake released about 390 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 39,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 28,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.5× the energy of this one
  4. This earthquake M 2.7 about 390 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 48.3533, -121.7625. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 16 km (10 mi) SSE of here earthquakes near Skagit County
Snohomish County, WA 33 km (21 mi) N of here earthquakes near Snohomish County
Whatcom County, WA 55 km (34 mi) S of here earthquakes near Whatcom County
Island County, WA 71 km (44 mi) ENE of here earthquakes near Island County
King County, WA 96 km (60 mi) N of here earthquakes near King County
San Juan County, WA 100 km (62 mi) E of here earthquakes near San Juan 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. 1.7 2 km E of Granite Falls, Washington
  2. 1.1 6 km NE of Oso, Washington
  3. 0.7 6 km SSE of Concrete, Washington
  4. 1.6 3 km WSW of Lake Cavanaugh, Washington
  5. 2.6 2 km ENE of Mount Vernon, Washington
  6. 1.8 15 km ESE of Acme, Washington
  7. 1.9 7 km SSE of Concrete, Washington
  8. 1.5 2 km E of Granite Falls, Washington
  9. 1.9 2 km NNE of Lyman, Washington
  10. 1.7 3 km N of Lyman, Washington
  11. 2.2 2 km N of Lyman, Washington
  12. 2.2 10 km NNE of Startup, Washington
  13. 1.5 2 km ENE of Granite Falls, Washington
  14. 1.6 3 km E of Granite Falls, Washington
  15. 1.8 5 km E of Acme, 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.