QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

1 km SSE of Riverton, Washington

· 28 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 33 kmKing County 34 kmPierce County 48 kmMason County 68 kmThurston County 73 kmSnohomish County 75 kmIsland County 81 kmJefferson County 100 kmLewis County 100 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
28 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 33 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 568 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 10 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 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 47.4755, -122.2903. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 33 km (20 mi) SE of here earthquakes near Kitsap County
King County, WA 34 km (21 mi) W of here earthquakes near King County
Pierce County, WA 48 km (30 mi) NNW of here earthquakes near Pierce County
Mason County, WA 68 km (42 mi) ENE of here earthquakes near Mason County
Thurston County, WA 73 km (45 mi) NE of here earthquakes near Thurston County
Snohomish County, WA 75 km (47 mi) SSW of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 2.2 3 km ENE of Lake Marcel-Stillwater, Washington
  2. 1.6 3 km ENE of Echo Lake, Washington
  3. 2.9 4 km S of Monroe, Washington
  4. 2.0 2 km N of North Bend, Washington
  5. 2.0 2 km NE of Black Diamond, Washington
  6. 2.8 2 km S of Ravensdale, Washington
  7. 2.4 0 km NE of Enetai, Washington
  8. 2.0 2 km NE of Enetai, Washington
  9. 1.7 3 km SW of Bainbridge Island, Washington
  10. 1.6 2 km SSE of Bainbridge Island, Washington
  11. 1.5 2 km NE of Enetai, Washington
  12. 1.6 3 km SSW of Bainbridge Island, Washington
  13. 1.9 1 km ENE of Enetai, Washington
  14. 3.2 0 km NNE of Enetai, Washington
  15. 1.6 2 km SW of Elk Plain, 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 22,000 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.