QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

Washington

· 8.1 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 29 kmSnohomish County 38 kmKitsap County 53 kmIsland County 71 kmPierce County 78 kmSkagit County 84 kmChelan County 101 kmMason County 101 kmThurston County 111 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 1.5 (ml)
Depth
8.1 km below the surface
Felt
no reports yet
Nearest
King County, 29 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1312 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 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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 47.7398, -121.9555. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 29 km (18 mi) NNW of here earthquakes near King County
Snohomish County, WA 38 km (23 mi) SSW of here earthquakes near Snohomish County
Kitsap County, WA 53 km (33 mi) ENE of here earthquakes near Kitsap County
Island County, WA 71 km (44 mi) SE of here earthquakes near Island County
Pierce County, WA 78 km (48 mi) N of here earthquakes near Pierce County
Skagit County, WA 84 km (52 mi) S of here earthquakes near Skagit County

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

Aftershocks so far

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

  1. 1.9 10 km NE of Lake Marcel-Stillwater, Washington
  2. 1.6 2 km W of Clinton, Washington
  3. 2.1 3 km ENE of East Renton Highlands, Washington
  4. 1.6 2 km NNE of Lea Hill, Washington
  5. 2.4 8 km SSW of Sultan, Washington
  6. 1.6 11 km NE of Snoqualmie, Washington
  7. 2.1 1 km NW of Meadowdale, Washington
  8. 1.6 Washington
  9. 2.6 11 km NE of Snoqualmie, Washington
  10. 1.7 8 km NE of Fall City, Washington
  11. 2.3 0 km WSW of Bothell West, Washington
  12. 1.7 3 km ENE of Bainbridge Island, Washington
  13. 1.6 2 km E of Granite Falls, Washington
  14. 1.9 10 km S of Sultan, Washington
  15. 2.5 9 km NNE of Snoqualmie, 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 42,000 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.