QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

4 km ESE of Cathcart, Washington

· 26 km deep · released about 1,000 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 32 kmKing County 41 kmKitsap County 50 kmIsland County 59 kmSkagit County 75 kmPierce County 87 kmMason County 100 kmChelan County 106 kmSan Juan County 109 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 3.0 (ml)
Depth
26 km below the surface
Felt
476 reports · strongest reported intensity III
Measured shaking
intensity II (ShakeMap)
Nearest
Snohomish County, 32 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 139 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 476 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,000 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 330,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 10,000× the energy of this one
  4. This earthquake M 3.0 about 1,000 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 47.8320, -122.0433. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 32 km (20 mi) SW of here earthquakes near Snohomish County
King County, WA 41 km (26 mi) NNW of here earthquakes near King County
Kitsap County, WA 50 km (31 mi) ENE of here earthquakes near Kitsap County
Island County, WA 59 km (37 mi) SE of here earthquakes near Island County
Skagit County, WA 75 km (47 mi) SSW of here earthquakes near Skagit County
Pierce County, WA 87 km (54 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

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

  1. 1.7 2 km E of Granite Falls, Washington
  2. 1.2 1 km NW of Lake Marcel-Stillwater, Washington
  3. 1.7 0 km W of Lake Stickney, Washington
  4. 2.1 10 km ENE of Fall City, Washington
  5. 1.0 5 km WSW of Wilderness Rim, Washington
  6. 2.4 5 km SW of Wilderness Rim, Washington
  7. 1.1 2 km NW of Lake Marcel-Stillwater, Washington
  8. 0.8 4 km E of Carnation, Washington
  9. 2.0 3 km ESE of East Renton Highlands, Washington
  10. 0.5 2 km S of Union Hill-Novelty Hill, Washington
  11. 2.1 4 km SW of Wilderness Rim, Washington
  12. 2.1 4 km NNE of Snoqualmie, Washington
  13. 1.6 1 km NNE of Maple Valley, Washington
  14. 1.7 2 km NNE of May Creek, Washington
  15. 1.5 5 km SSW of Monroe, 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 220 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.