QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

5 km NNE of Alger, Washington

· 21 km deep · released about 79 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Whatcom County 41 kmSkagit County 42 kmSan Juan County 60 kmIsland County 62 kmSnohomish County 79 kmKitsap County 116 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 2.3 (ml)
Depth
21 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
Whatcom County, 41 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2837 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 79 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 190,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 130,000× the energy of this one
  3. Around the size people start to feel M 3.0 12× the energy of this one
  4. This earthquake M 2.3 about 79 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 48.6643, -122.3260. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Whatcom County, WA 41 km (25 mi) WSW of here earthquakes near Whatcom County
Skagit County, WA 42 km (26 mi) WNW of here earthquakes near Skagit County
San Juan County, WA 60 km (37 mi) ENE of here earthquakes near San Juan County
Island County, WA 62 km (38 mi) NNE of here earthquakes near Island County
Snohomish County, WA 79 km (49 mi) NNW of here earthquakes near Snohomish County
Kitsap County, WA 116 km (72 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

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

  1. 2.3 5 km N of Anacortes, Washington
  2. 1.7 4 km NE of Oak Harbor, Washington
  3. 2.3 6 km WSW of Kendall, Washington
  4. 1.7 4 km WSW of Blaine, Washington
  5. 1.7 4 km SW of Blaine, Washington
  6. 1.9 5 km SW of Blaine, Washington
  7. 1.5 2 km NNW of Birch Bay, Washington
  8. 2.3 12 km WNW of Edison, Washington
  9. 2.2 5 km NE of Ferndale, Washington
  10. 1.6 7 km NE of Sudden Valley, Washington
  11. 2.1 1 km WNW of Glacier, Washington
  12. 1.7 10 km N of Hamilton, Washington
  13. 1.6 4 km S of Lake Cavanaugh, Washington
  14. 2.6 0 km SSW of Oak Harbor, Washington
  15. 1.6 4 km ENE of Oak Harbor, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.