QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1 km SSE of Mercer Island, Washington

· 1.1 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 30 kmKitsap County 34 kmPierce County 56 kmSnohomish County 65 kmIsland County 75 kmMason County 75 kmThurston County 83 kmJefferson County 102 kmSkagit County 108 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
1.1 km below the surface
Felt
no reports yet
Nearest
King County, 30 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3378 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× 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 47.5560, -122.2172. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 30 km (18 mi) WNW of here earthquakes near King County
Kitsap County, WA 34 km (21 mi) ESE of here earthquakes near Kitsap County
Pierce County, WA 56 km (35 mi) N of here earthquakes near Pierce County
Snohomish County, WA 65 km (40 mi) SSW of here earthquakes near Snohomish County
Island County, WA 75 km (47 mi) SSE of here earthquakes near Island County
Mason County, WA 75 km (47 mi) ENE of here earthquakes near Mason 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. 1.6 3 km WSW of West Lake Stevens, Washington
  2. 1.8 4 km SE of Ames Lake, Washington
  3. 1.9 0 km SSE of Enetai, Washington
  4. 1.6 3 km NW of Burley, Washington
  5. 1.8 3 km NW of Cottage Lake, Washington
  6. 1.7 2 km WNW of Federal Way, Washington
  7. 1.7 1 km NNE of Lynnwood, Washington
  8. 2.1 5 km ESE of Indianola, Washington
  9. 1.9 1 km WNW of Bonney Lake, Washington
  10. 1.5 3 km N of Union Hill-Novelty Hill, Washington
  11. 1.5 1 km N of White Center, Washington
  12. 2.0 0 km WNW of Bonney Lake, Washington
  13. 2.2 2 km ENE of Enetai, Washington
  14. 1.6 5 km NNE of Dash Point, Washington
  15. 1.7 3 km NE of Tanner, 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.