QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

17 km NNW of Jamestown, Washington

· 45 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 27 kmIsland County 39 kmClallam County 57 kmJefferson County 58 kmKitsap County 80 kmMason County 102 kmSkagit County 103 kmSnohomish County 107 kmWhatcom 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 1.8 (ml)
Depth
45 km below the surface
Felt
no reports yet
Nearest
San Juan County, 27 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 614 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 16 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 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 48.2722, -123.1640. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 27 km (16 mi) S of here earthquakes near San Juan County
Island County, WA 39 km (24 mi) WNW of here earthquakes near Island County
Clallam County, WA 57 km (35 mi) ENE of here earthquakes near Clallam County
Jefferson County, WA 58 km (36 mi) NNE of here earthquakes near Jefferson County
Kitsap County, WA 80 km (50 mi) NNW of here earthquakes near Kitsap County
Mason County, WA 102 km (64 mi) N of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 2.9 2 km ESE of Oak Harbor, Washington
  2. 2.2 5 km NW of Orcas, Washington
  3. 2.4 4 km SSW of Anacortes, Washington
  4. 2.4 11 km S of Metchosin, Canada
  5. 1.8 4 km SSW of Anacortes, Washington
  6. 1.7 2 km S of River Road, Washington
  7. 1.6 2 km W of Port Townsend, Washington
  8. 1.5 7 km WNW of Friday Harbor, Washington
  9. 2.7 12 km WSW of Anacortes, Washington
  10. 1.8 8 km W of Ault Field, Washington
  11. 1.6 3 km N of Langford, Canada
  12. 1.8 10 km S of Victoria, Canada
  13. 2.3 5 km SSE of Esquimalt, Canada
  14. 2.9 8 km SW of Port Angeles, Washington
  15. 1.7 6 km SW of Saanichton, Canada

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 4.3 on 2023-10-09 — it released about 5,600 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.