QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

3 km N of West Lake Sammamish, Washington

· 13 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 25 kmKitsap County 41 kmSnohomish County 56 kmPierce County 62 kmIsland County 74 kmMason County 85 kmThurston County 93 kmSkagit County 100 kmJefferson 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 1.7 (ml)
Depth
13 km below the surface
Felt
no reports yet
Nearest
King County, 25 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 986 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 47.6120, -122.1095. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 25 km (15 mi) WNW of here earthquakes near King County
Kitsap County, WA 41 km (25 mi) E of here earthquakes near Kitsap County
Snohomish County, WA 56 km (35 mi) SSW of here earthquakes near Snohomish County
Pierce County, WA 62 km (39 mi) N of here earthquakes near Pierce County
Island County, WA 74 km (46 mi) SE of here earthquakes near Island County
Mason County, WA 85 km (53 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

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

  1. 1.5 1 km ESE of Three Lakes, Washington
  2. 1.9 5 km E of Enumclaw, Washington
  3. 1.6 10 km NNE of Snoqualmie, Washington
  4. 2.5 10 km NE of Snoqualmie, Washington
  5. 2.0 0 km WSW of Lynnwood, Washington
  6. 1.7 3 km N of Woods Creek, Washington
  7. 1.9 11 km NE of Snoqualmie, Washington
  8. 1.7 4 km WNW of Bainbridge Island, Washington
  9. 1.5 5 km WSW of Black Diamond, Washington
  10. 1.7 1 km WSW of Burien, Washington
  11. 1.6 2 km N of Edmonds, Washington
  12. 1.9 3 km SE of Fife, Washington
  13. 1.9 3 km SSE of Woods Creek, Washington
  14. 1.6 4 km N of Woods Creek, Washington
  15. 1.8 3 km S of Southworth, 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 21,000 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.