QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4 km NNW of Bryant, Washington

· 3.4 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Skagit County 35 kmSnohomish County 39 kmIsland County 39 kmWhatcom County 67 kmSan Juan County 73 kmKitsap County 80 kmKing County 91 kmJefferson County 114 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
3.4 km below the surface
Felt
no reports yet
Nearest
Skagit County, 35 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1234 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 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× 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 48.2802, -122.1725. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Skagit County, WA 35 km (22 mi) SW of here earthquakes near Skagit County
Snohomish County, WA 39 km (24 mi) NW of here earthquakes near Snohomish County
Island County, WA 39 km (24 mi) ENE of here earthquakes near Island County
Whatcom County, WA 67 km (42 mi) SSW of here earthquakes near Whatcom County
San Juan County, WA 73 km (46 mi) ESE of here earthquakes near San Juan County
Kitsap County, WA 80 km (49 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

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

  1. 1.9 6 km S of Acme, Washington
  2. 1.7 1 km ESE of Oso, Washington
  3. 1.5 3 km E of Granite Falls, Washington
  4. 1.9 14 km ESE of Acme, Washington
  5. 1.8 14 km NNE of Lyman, Washington
  6. 1.6 5 km SSW of Anacortes, Washington
  7. 1.7 5 km ESE of Coupeville, Washington
  8. 1.5 2 km ENE of Granite Falls, Washington
  9. 1.6 6 km W of Edison, Washington
  10. 1.8 2 km ENE of Granite Falls, Washington
  11. 2.8 3 km E of Port Townsend, Washington
  12. 1.7 9 km SW of Concrete, Washington
  13. 1.8 2 km SW of Sedro-Woolley, Washington
  14. 3.3 1 km NNE of Coupeville, Washington
  15. 2.7 1 km S of Roosevelt, 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 18,000 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.