QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

14 km S of Gold Bar, Washington

· 28 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 28 kmSnohomish County 36 kmKitsap County 71 kmPierce County 83 kmChelan County 83 kmSkagit County 85 kmIsland County 86 kmKittitas County 103 kmMason County 118 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
28 km below the surface
Felt
no reports yet
Nearest
King County, 28 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 566 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 47.7302, -121.7087. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 28 km (18 mi) NNE of here earthquakes near King County
Snohomish County, WA 36 km (23 mi) S of here earthquakes near Snohomish County
Kitsap County, WA 71 km (44 mi) E of here earthquakes near Kitsap County
Pierce County, WA 83 km (51 mi) NNE of here earthquakes near Pierce County
Chelan County, WA 83 km (51 mi) W of here earthquakes near Chelan County
Skagit County, WA 85 km (53 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

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

  1. 3.9 9 km NNE of Snoqualmie, Washington
  2. 1.6 7 km NE of Fall City, Washington
  3. 1.6 2 km E of Granite Falls, Washington
  4. 1.9 14 km S of May Creek, Washington
  5. 2.7 1 km NW of Maple Valley, Washington
  6. 1.8 1 km SSW of Three Lakes, Washington
  7. 1.7 6 km ESE of Tanner, Washington
  8. 1.5 2 km ENE of Granite Falls, Washington
  9. 1.5 2 km E of Granite Falls, Washington
  10. 1.8 1 km ESE of Union Hill-Novelty Hill, Washington
  11. 1.6 0 km NNE of Lake Marcel-Stillwater, Washington
  12. 1.6 Puget Sound region, Washington
  13. 1.7 4 km E of Granite Falls, Washington
  14. 1.6 0 km N of Lake Marcel-Stillwater, Washington
  15. 2.3 3 km W of Hobart, 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 13,000 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.