QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

3 km NNE of Klahanie, Washington

· 13 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 17 kmKitsap County 50 kmSnohomish County 53 kmPierce County 62 kmIsland County 81 kmMason County 93 kmThurston County 97 kmSkagit County 100 kmChelan County 106 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
13 km below the surface
Felt
no reports yet
Nearest
King County, 17 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3441 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 47.5977, -121.9872. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 17 km (10 mi) NW of here earthquakes near King County
Kitsap County, WA 50 km (31 mi) E of here earthquakes near Kitsap County
Snohomish County, WA 53 km (33 mi) SSW of here earthquakes near Snohomish County
Pierce County, WA 62 km (39 mi) NNE of here earthquakes near Pierce County
Island County, WA 81 km (50 mi) SE of here earthquakes near Island County
Mason County, WA 93 km (58 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. 1.9 1 km NW of Maple Valley, Washington
  2. 2.1 1 km NNW of Maple Valley, Washington
  3. 1.7 1 km NW of Maple Valley, Washington
  4. 1.7 1 km N of Lake Roesiger, Washington
  5. 1.6 3 km WSW of West Lake Stevens, Washington
  6. 1.8 4 km SE of Ames Lake, Washington
  7. 1.8 3 km NW of Cottage Lake, Washington
  8. 1.7 2 km WNW of Federal Way, Washington
  9. 1.7 1 km NNE of Lynnwood, Washington
  10. 2.1 5 km ESE of Indianola, Washington
  11. 1.9 1 km WNW of Bonney Lake, Washington
  12. 1.5 3 km N of Union Hill-Novelty Hill, Washington
  13. 1.7 4 km ENE of May Creek, Washington
  14. 1.5 1 km N of White Center, Washington
  15. 2.0 0 km WNW of Bonney Lake, 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.