QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

1 km S of Shoreline, Washington

· 25 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kitsap County 26 kmKing County 47 kmIsland County 53 kmSnohomish County 55 kmMason County 76 kmPierce County 78 kmJefferson County 89 kmSkagit County 92 kmThurston County 97 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
25 km below the surface
Felt
no reports yet
Nearest
Kitsap County, 26 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 178 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 830,000× the energy of this one
  3. Around the size people start to feel M 3.0 74× the energy of this one
  4. This earthquake M 1.8 about 13 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 47.7400, -122.3398. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kitsap County, WA 26 km (16 mi) ENE of here earthquakes near Kitsap County
King County, WA 47 km (29 mi) NW of here earthquakes near King County
Island County, WA 53 km (33 mi) SSE of here earthquakes near Island County
Snohomish County, WA 55 km (34 mi) SW of here earthquakes near Snohomish County
Mason County, WA 76 km (47 mi) NE of here earthquakes near Mason County
Pierce County, WA 78 km (48 mi) N of here earthquakes near Pierce County

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

Aftershocks so far

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

  1. 1.7 2 km E of Granite Falls, Washington
  2. 1.1 3 km NNW of Dash Point, Washington
  3. 1.2 1 km NW of Lake Marcel-Stillwater, Washington
  4. 1.7 0 km W of Lake Stickney, Washington
  5. 1.1 2 km NW of Lake Marcel-Stillwater, Washington
  6. 0.8 4 km E of Carnation, Washington
  7. 2.0 3 km ESE of East Renton Highlands, Washington
  8. 0.5 2 km S of Union Hill-Novelty Hill, Washington
  9. 2.1 4 km NNE of Snoqualmie, Washington
  10. 1.6 1 km NNE of Maple Valley, Washington
  11. 1.5 5 km SSW of Monroe, Washington
  12. 1.5 2 km E of Granite Falls, Washington
  13. 1.6 8 km S of Port Hadlock-Irondale, Washington
  14. 1.5 2 km WNW of Ames Lake, Washington
  15. 1.7 2 km NNW of Enetai, 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 17,000 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.