QuakeIndex

Earthquake · reviewed by a seismologist

M 3.7ml

12 km E of Greenwater, Washington

· 9.4 km deep · released about 5.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 44 kmPierce County 52 kmKittitas County 61 kmLewis County 94 kmYakima County 98 kmSnohomish County 100 kmChelan County 101 kmKitsap County 102 kmThurston County 105 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 3.7 (ml)
Depth
9.4 km below the surface
Felt
344 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
King County, 44 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 476 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 344 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.2 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.7 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 33,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 1,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,000× the energy of this one
  4. This earthquake M 3.7 about 5.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 11× more

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 47.1717, -121.4863. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 44 km (27 mi) SE of here earthquakes near King County
Pierce County, WA 52 km (32 mi) ENE of here earthquakes near Pierce County
Kittitas County, WA 61 km (38 mi) W of here earthquakes near Kittitas County
Lewis County, WA 94 km (59 mi) NE of here earthquakes near Lewis County
Yakima County, WA 98 km (61 mi) NW of here earthquakes near Yakima County
Snohomish County, WA 100 km (62 mi) SSE of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 2.0 22 km ENE of Ashford, Washington
  2. 2.2 2 km SE of Buckley, Washington
  3. 2.5 2 km SE of Buckley, Washington
  4. 1.8 2 km ESE of Buckley, Washington
  5. 2.2 24 km ENE of Ashford, Washington
  6. 1.6 10 km ENE of Snoqualmie, Washington
  7. 1.6 9 km ENE of Snoqualmie, Washington
  8. 2.2 4 km ESE of Enumclaw, Washington
  9. 1.6 5 km SE of Enumclaw, Washington
  10. 1.8 16 km SSE of Carbonado, Washington
  11. 1.6 3 km NE of Wilkeson, Washington
  12. 1.6 17 km NNE of Ashford, Washington
  13. 2.3 7 km NE of Snoqualmie, Washington
  14. 2.2 24 km ENE of Ashford, Washington
  15. 1.9 23 km ENE of Ashford, 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.