QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

5 km SW of Lake Cavanaugh, Washington

· 14 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 30 kmSnohomish County 36 kmIsland County 46 kmWhatcom County 64 kmSan Juan County 79 kmKitsap County 84 kmKing County 91 kmChelan County 119 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
14 km below the surface
Felt
no reports yet
Nearest
Skagit County, 30 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1881 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 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 48.2947, -122.0860. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 30 km (18 mi) SW of here earthquakes near Skagit County
Snohomish County, WA 36 km (22 mi) NW of here earthquakes near Snohomish County
Island County, WA 46 km (29 mi) ENE of here earthquakes near Island County
Whatcom County, WA 64 km (40 mi) SSW of here earthquakes near Whatcom County
San Juan County, WA 79 km (49 mi) ESE of here earthquakes near San Juan County
Kitsap County, WA 84 km (52 mi) NNE of here earthquakes near Kitsap 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. 3.4 6 km ENE of Oso, Washington
  2. 2.1 6 km NNW of La Conner, Washington
  3. 1.5 1 km NNW of Granite Falls, Washington
  4. 3.6 2 km E of Mount Vernon, Washington
  5. 1.5 3 km NNE of Picnic Point, Washington
  6. 2.9 7 km NE of Darrington, Washington
  7. 1.9 1 km WNW of Mount Vernon, Washington
  8. 1.7 1 km ESE of Acme, Washington
  9. 1.6 2 km ENE of Granite Falls, Washington
  10. 1.8 1 km SW of Monroe North, Washington
  11. 2.0 4 km W of Lake Cavanaugh, Washington
  12. 1.7 1 km NNW of Silvana, Washington
  13. 1.6 2 km E of Granite Falls, Washington
  14. 2.2 1 km NNE of Cathcart, Washington
  15. 1.8 2 km ENE of Granite Falls, 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 16,000 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.