QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

3 km N of Cathcart, Washington

· 28 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 32 kmKing County 48 kmKitsap County 49 kmIsland County 53 kmSkagit County 71 kmPierce County 92 kmMason County 100 kmSan Juan County 102 kmJefferson County 107 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
28 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 32 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 568 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 47.8797, -122.0975. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 32 km (20 mi) SW of here earthquakes near Snohomish County
King County, WA 48 km (30 mi) NNW of here earthquakes near King County
Kitsap County, WA 49 km (31 mi) ENE of here earthquakes near Kitsap County
Island County, WA 53 km (33 mi) SE of here earthquakes near Island County
Skagit County, WA 71 km (44 mi) SSW of here earthquakes near Skagit County
Pierce County, WA 92 km (57 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. 2.2 1 km E of Enetai, Washington
  2. 1.8 Puget Sound region, Washington
  3. 3.0 6 km ENE of Carnation, Washington
  4. 2.2 3 km ENE of Lake Marcel-Stillwater, Washington
  5. 1.6 3 km ENE of Echo Lake, Washington
  6. 2.9 4 km S of Monroe, Washington
  7. 2.0 2 km N of North Bend, Washington
  8. 2.4 0 km NE of Enetai, Washington
  9. 1.8 4 km ENE of Granite Falls, Washington
  10. 2.0 2 km NE of Enetai, Washington
  11. 1.7 3 km SW of Bainbridge Island, Washington
  12. 1.6 2 km SSE of Bainbridge Island, Washington
  13. 1.5 2 km NE of Enetai, Washington
  14. 1.6 3 km SSW of Bainbridge Island, Washington
  15. 1.9 1 km ENE 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 14,000 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.