QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

10 km WSW of Friday Harbor, Washington

· 48 km deep · released about 400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 4 kmIsland County 51 kmClallam County 69 kmJefferson County 81 kmSkagit County 98 kmKitsap County 102 kmWhatcom County 104 kmSnohomish 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 2.8 (ml)
Depth
48 km below the surface
Felt
19 reports · strongest reported intensity III
Measured shaking
intensity I (ShakeMap)
Nearest
San Juan County, 4 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 610 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 19 people have reported feeling it to USGS.

How big was it?

This earthquake released about 400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 38,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 27,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.4× the energy of this one
  4. This earthquake M 2.8 about 400 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 48.4937, -123.1512. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 4 km (2 mi) WSW of here earthquakes near San Juan County
Island County, WA 51 km (32 mi) NW of here earthquakes near Island County
Clallam County, WA 69 km (43 mi) NE of here earthquakes near Clallam County
Jefferson County, WA 81 km (51 mi) NNE of here earthquakes near Jefferson County
Skagit County, WA 98 km (61 mi) W of here earthquakes near Skagit County
Kitsap County, WA 102 km (63 mi) NNW of here earthquakes near Kitsap County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.8 2 km ESE of Oak Harbor, Washington
  2. 2.3 3 km ESE of Oak Harbor, Washington
  3. 2.0 2 km E of Oak Harbor, Washington
  4. 2.3 2 km E of Oak Harbor, Washington
  5. 3.8 2 km E of Oak Harbor, Washington
  6. 2.4 2 km ESE of Oak Harbor, Washington
  7. 1.5 2 km E of Oak Harbor, Washington
  8. 2.0 2 km ESE of Oak Harbor, Washington
  9. 1.6 2 km ESE of Oak Harbor, Washington
  10. 2.4 2 km ESE of Oak Harbor, Washington
  11. 2.9 2 km ESE of Oak Harbor, Washington
  12. 2.1 5 km N of Anacortes, Washington
  13. 2.2 5 km NW of Orcas, Washington
  14. 2.4 4 km SSW of Anacortes, Washington
  15. 2.0 5 km N of Anacortes, 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.