QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4ml

2 km N of City of Sammamish, Washington

· 20 km deep · released about 130 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 21 kmKitsap County 46 kmSnohomish County 51 kmPierce County 65 kmIsland County 76 kmMason County 91 kmSkagit County 97 kmThurston County 98 kmChelan County 109 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 2.4 (ml)
Depth
20 km below the surface
Felt
10 reports · strongest reported intensity IV
Nearest
King County, 21 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 458 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 10 people have reported feeling it to USGS.

How big was it?

This earthquake released about 130 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 80,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.2× the energy of this one
  4. This earthquake M 2.4 about 130 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 47.6295, -122.0325. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 21 km (13 mi) NW of here earthquakes near King County
Kitsap County, WA 46 km (29 mi) E of here earthquakes near Kitsap County
Snohomish County, WA 51 km (32 mi) SSW of here earthquakes near Snohomish County
Pierce County, WA 65 km (40 mi) N of here earthquakes near Pierce County
Island County, WA 76 km (47 mi) SE of here earthquakes near Island County
Mason County, WA 91 km (57 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

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

  1. 1.7 9 km NNE of Snoqualmie, Washington
  2. 1.6 2 km SSW of Clinton, Washington
  3. 3.0 4 km ESE of Cathcart, Washington
  4. 1.7 3 km SSW of Clinton, Washington
  5. 2.0 3 km SSW of Clinton, Washington
  6. 1.6 4 km E of Carnation, Washington
  7. 1.6 1 km E of Clyde Hill, Washington
  8. 1.7 11 km NNE of Snoqualmie, Washington
  9. 1.5 0 km ESE of Browns Point, Washington
  10. 1.6 2 km E of Enetai, Washington
  11. 2.6 1 km ENE of Enetai, Washington
  12. 3.0 2 km NNW of Ames Lake, Washington
  13. 2.4 8 km N of North Sultan, Washington
  14. 1.7 2 km E of Yarrow Point, Washington
  15. 1.8 2 km W of Bainbridge Island, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.6 on 2019-07-12 — it released about 1,700 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.