QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1 km NE of Normandy Park, Washington

· 23 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 32 kmKing County 37 kmPierce County 46 kmMason County 65 kmThurston County 69 kmSnohomish County 79 kmIsland County 83 kmLewis County 97 kmJefferson County 98 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
23 km below the surface
Felt
6 reports · strongest reported intensity III
Nearest
Kitsap County, 32 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2773 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 6 people have reported feeling it to USGS.

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 47.4500, -122.3242. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 32 km (20 mi) SE of here earthquakes near Kitsap County
King County, WA 37 km (23 mi) W of here earthquakes near King County
Pierce County, WA 46 km (29 mi) NNW of here earthquakes near Pierce County
Mason County, WA 65 km (40 mi) E of here earthquakes near Mason County
Thurston County, WA 69 km (43 mi) NNE of here earthquakes near Thurston County
Snohomish County, WA 79 km (49 mi) SSW of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 1.8 4 km N of Duvall, Washington
  2. 1.8 5 km NNE of Duvall, Washington
  3. 1.6 6 km NE of Fall City, Washington
  4. 1.7 3 km ENE of Enetai, Washington
  5. 1.9 3 km WSW of Wilderness Rim, Washington
  6. 1.6 3 km E of Cathcart, Washington
  7. 2.1 Puget Sound region, Washington
  8. 1.5 3 km ENE of Enetai, Washington
  9. 1.6 1 km SW of Keyport, Washington
  10. 1.5 2 km N of Boulevard Park, Washington
  11. 1.5 2 km SSW of Lynnwood, Washington
  12. 1.6 4 km ESE of Carnation, Washington
  13. 1.6 3 km ENE of Cathcart, Washington
  14. 2.8 8 km NNE of Snoqualmie, Washington
  15. 1.8 1 km N of Fairwood, 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.