QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

3 km WNW of Navy Yard City, Washington

· -0.4 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 10 kmMason County 42 kmKing County 66 kmIsland County 66 kmJefferson County 67 kmThurston County 70 kmPierce County 71 kmSnohomish County 89 kmGrays Harbor County 98 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
-0.4 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 10 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1909 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 47.5628, -122.7097. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 10 km (6 mi) SSW of here earthquakes near Kitsap County
Mason County, WA 42 km (26 mi) NE of here earthquakes near Mason County
King County, WA 66 km (41 mi) W of here earthquakes near King County
Island County, WA 66 km (41 mi) S of here earthquakes near Island County
Jefferson County, WA 67 km (42 mi) ESE of here earthquakes near Jefferson County
Thurston County, WA 70 km (44 mi) N of here earthquakes near Thurston County

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

Aftershocks so far

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

  1. 1.5 6 km WSW of Erlands Point-Kitsap Lake, Washington
  2. 1.8 3 km W of Hansville, Washington
  3. 2.4 3 km W of Hansville, Washington
  4. 1.8 2 km WNW of Gorst, Washington
  5. 2.4 0 km ENE of Enetai, Washington
  6. 2.6 4 km WNW of Quilcene, Washington
  7. 1.8 6 km SSW of Port Ludlow, Washington
  8. 1.5 5 km N of Belfair, Washington
  9. 2.0 13 km WSW of Longbranch, Washington
  10. 1.7 5 km SW of Seattle, Washington
  11. 1.6 Olympic Peninsula, Washington
  12. 1.6 8 km N of Belfair, Washington
  13. 1.8 3 km ESE of Port Ludlow, Washington
  14. 2.0 6 km SSW of Port Ludlow, Washington
  15. 1.5 3 km NNE of Picnic Point, 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 2,900 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.