QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

2 km SSE of Lake Forest Park, Washington

· 27 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 30 kmKing County 43 kmSnohomish County 52 kmIsland County 56 kmPierce County 77 kmMason County 80 kmSkagit County 91 kmJefferson County 94 kmThurston 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
27 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 30 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 565 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 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× 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 47.7363, -122.2715. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 30 km (19 mi) ENE of here earthquakes near Kitsap County
King County, WA 43 km (27 mi) NW of here earthquakes near King County
Snohomish County, WA 52 km (32 mi) SW of here earthquakes near Snohomish County
Island County, WA 56 km (35 mi) SSE of here earthquakes near Island County
Pierce County, WA 77 km (48 mi) N of here earthquakes near Pierce County
Mason County, WA 80 km (50 mi) ENE of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 1.5 5 km SW of Port Ludlow, Washington
  2. 1.9 2 km SSW of Esperance, Washington
  3. 1.8 1 km W of Suquamish, Washington
  4. 1.7 1 km S of Dash Point, Washington
  5. 1.8 0 km N of Enetai, Washington
  6. 1.7 2 km ESE of Enetai, Washington
  7. 1.7 1 km ENE of Granite Falls, Washington
  8. 1.6 2 km NNE of Woods Creek, Washington
  9. 1.5 4 km SW of Port Ludlow, Washington
  10. 1.6 4 km ESE of Quilcene, Washington
  11. 1.5 Washington
  12. 1.9 1 km NNW of Des Moines, Washington
  13. 2.0 Puget Sound region, Washington
  14. 2.4 0 km NW of Des Moines, Washington
  15. 1.7 2 km SSW of Burien, 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 13,000 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.