QuakeIndex

explosion · reviewed by a seismologist

M 1.7ml

2 km SSW of Gorst, Washington

· -0.2 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 16 kmMason County 38 kmThurston County 64 kmPierce County 66 kmKing County 66 kmJefferson County 69 kmIsland County 73 kmSnohomish County 94 kmGrays Harbor County 94 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
-0.2 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 16 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1278 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

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 47.5057, -122.7168. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 16 km (10 mi) SSW of here earthquakes near Kitsap County
Mason County, WA 38 km (24 mi) ENE of here earthquakes near Mason County
Thurston County, WA 64 km (40 mi) N of here earthquakes near Thurston County
Pierce County, WA 66 km (41 mi) NW of here earthquakes near Pierce County
King County, WA 66 km (41 mi) W of here earthquakes near King County
Jefferson County, WA 69 km (43 mi) ESE of here earthquakes near Jefferson 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. 1.7 0 km S of Belfair, Washington
  2. 2.0 1 km SSE of Dash Point, Washington
  3. 1.6 10 km WNW of Belfair, Washington
  4. 1.7 1 km E of White Center, Washington
  5. 2.6 1 km SSW of Burien, Washington
  6. 1.7 5 km SSW of Port Ludlow, Washington
  7. 2.3 24 km W of Quilcene, Washington
  8. 1.9 5 km SSE of Seattle, Washington
  9. 1.8 4 km SSE of Seabeck, Washington
  10. 4.0 6 km W of Quilcene, Washington
  11. 2.1 1 km NW of Meadowdale, Washington
  12. 1.7 4 km WNW of Vashon, Washington
  13. 1.7 1 km WNW of Chico, Washington
  14. 1.7 5 km SSW of Port Ludlow, Washington
  15. 1.9 10 km WNW of Allyn, 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 4.1 on 2017-02-23 — it released about 4,100 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.