QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

3 km ENE of Lake Roesiger, Washington

· 16 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 11 kmSkagit County 55 kmKing County 57 kmIsland County 61 kmKitsap County 70 kmWhatcom County 94 kmChelan County 96 kmSan Juan County 106 kmPierce County 107 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 1.8 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 11 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3451 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 48.0002, -121.8887. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 11 km (7 mi) WSW of here earthquakes near Snohomish County
Skagit County, WA 55 km (34 mi) S of here earthquakes near Skagit County
King County, WA 57 km (35 mi) N of here earthquakes near King County
Island County, WA 61 km (38 mi) ESE of here earthquakes near Island County
Kitsap County, WA 70 km (43 mi) NE of here earthquakes near Kitsap County
Whatcom County, WA 94 km (58 mi) S of here earthquakes near Whatcom 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. 1.7 1 km N of Lake Roesiger, Washington
  2. 1.6 3 km WSW of West Lake Stevens, Washington
  3. 1.9 3 km E of Granite Falls, Washington
  4. 1.8 4 km SE of Ames Lake, Washington
  5. 1.8 3 km NW of Cottage Lake, Washington
  6. 2.2 4 km E of Silvana, Washington
  7. 1.5 5 km ENE of Lake Bosworth, Washington
  8. 1.7 1 km NNE of Lynnwood, Washington
  9. 1.8 3 km E of Granite Falls, Washington
  10. 1.5 3 km N of Union Hill-Novelty Hill, Washington
  11. 1.7 4 km ENE of May Creek, Washington
  12. 2.2 5 km NE of Oso, Washington
  13. 1.8 3 km E of Granite Falls, Washington
  14. 1.8 2 km WSW of Shoreline, Washington
  15. 2.0 6 km WSW of Lake Cavanaugh, 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.