QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1 km N of Fairwood, Washington

· 16 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 24 kmKitsap County 42 kmPierce County 46 kmSnohomish County 72 kmMason County 77 kmThurston County 78 kmIsland County 86 kmLewis County 100 kmJefferson 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 1.8 (ml)
Depth
16 km below the surface
Felt
28 reports · strongest reported intensity III
Nearest
King County, 24 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2535 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 28 people have reported feeling it to USGS.

How big was it?

This earthquake released about 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 47.4650, -122.1573. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 24 km (15 mi) W of here earthquakes near King County
Kitsap County, WA 42 km (26 mi) ESE of here earthquakes near Kitsap County
Pierce County, WA 46 km (29 mi) N of here earthquakes near Pierce County
Snohomish County, WA 72 km (45 mi) SSW of here earthquakes near Snohomish County
Mason County, WA 77 km (48 mi) E of here earthquakes near Mason County
Thurston County, WA 78 km (48 mi) NE of here earthquakes near Thurston 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. 3.2 3 km NNW of Lake Marcel-Stillwater, Washington
  2. 2.0 0 km SE of Carbonado, Washington
  3. 1.5 1 km NNW of Maple Valley, Washington
  4. 1.6 5 km WSW of North Bend, Washington
  5. 1.7 12 km W of Greenwater, Washington
  6. 1.6 3 km NE of Mirrormont, Washington
  7. 1.6 1 km E of Shoreline, Washington
  8. 1.9 3 km NW of Lake Marcel-Stillwater, Washington
  9. 1.9 3 km SW of Redmond, Washington
  10. 1.7 3 km ENE of Cathcart, Washington
  11. 1.6 6 km NE of Fall City, Washington
  12. 2.0 6 km E of Lake Marcel-Stillwater, Washington
  13. 1.9 12 km W of Greenwater, Washington
  14. 2.1 1 km NNE of Bainbridge Island, Washington
  15. 1.7 2 km NNW of Algona, 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 15,000 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.