QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

3 km WNW of Gorst, Washington

· -0.2 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 14 kmMason County 38 kmJefferson County 66 kmThurston County 67 kmKing County 69 kmPierce County 70 kmIsland County 70 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 1.8 (ml)
Depth
-0.2 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 14 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 725 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 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× 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 47.5322, -122.7477. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 14 km (9 mi) SSW of here earthquakes near Kitsap County
Mason County, WA 38 km (23 mi) ENE of here earthquakes near Mason County
Jefferson County, WA 66 km (41 mi) ESE of here earthquakes near Jefferson County
Thurston County, WA 67 km (41 mi) N of here earthquakes near Thurston County
King County, WA 69 km (43 mi) W of here earthquakes near King County
Pierce County, WA 70 km (43 mi) NW of here earthquakes near Pierce County

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

Aftershocks so far

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

  1. 1.6 3 km SSW of Shelton, Washington
  2. 1.7 3 km NNE of Dash Point, Washington
  3. 1.9 3 km SE of Gorst, Washington
  4. 1.6 1 km NNW of Boulevard Park, Washington
  5. 1.8 9 km SSW of Seabeck, Washington
  6. 2.1 0 km NNW of Esperance, Washington
  7. 1.7 2 km NNE of Enetai, Washington
  8. 1.5 2 km SSE of Gorst, Washington
  9. 1.6 1 km SW of Burien, Washington
  10. 1.5 5 km S of Port Ludlow, Washington
  11. 1.5 4 km ESE of Indianola, Washington
  12. 1.8 2 km WSW of Federal Way, Washington
  13. 2.0 2 km E of Tracyton, Washington
  14. 1.6 7 km NE of Quilcene, Washington
  15. 1.6 6 km S of Gorst, 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 2,400 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.