QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

8 km W of Ault Field, Washington

· 23 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 22 kmSan Juan County 30 kmSkagit County 73 kmKitsap County 79 kmJefferson County 81 kmSnohomish County 82 kmClallam County 86 kmWhatcom County 89 kmMason 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
23 km below the surface
Felt
no reports yet
Nearest
Island County, 22 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 241 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 48.3407, -122.7835. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 22 km (14 mi) NNW of here earthquakes near Island County
San Juan County, WA 30 km (19 mi) SE of here earthquakes near San Juan County
Skagit County, WA 73 km (46 mi) WSW of here earthquakes near Skagit County
Kitsap County, WA 79 km (49 mi) N of here earthquakes near Kitsap County
Jefferson County, WA 81 km (50 mi) NE of here earthquakes near Jefferson County
Snohomish County, WA 82 km (51 mi) WNW of here earthquakes near Snohomish County

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

Aftershocks so far

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

  1. 2.1 6 km ENE of Bell Hill, Washington
  2. 2.6 2 km ENE of Mount Vernon, Washington
  3. 1.6 2 km ESE of Oak Harbor, Washington
  4. 1.6 8 km S of Port Hadlock-Irondale, Washington
  5. 1.6 2 km E of Oak Harbor, Washington
  6. 2.1 3 km E of Oak Harbor, Washington
  7. 1.7 3 km E of Oak Harbor, Washington
  8. 2.1 3 km ESE of Oak Harbor, Washington
  9. 1.6 5 km N of Anacortes, Washington
  10. 2.1 3 km E of Oak Harbor, Washington
  11. 1.9 14 km NNE of Port Angeles East, Washington
  12. 1.6 8 km WNW of Orcas, Washington
  13. 1.7 8 km WNW of Orcas, Washington
  14. 1.8 8 km WNW of Orcas, Washington
  15. 1.9 4 km E of Port Townsend, 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 4.5 on 2025-03-03 — it released about 11,000 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.