QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

11 km WNW of Ault Field, Washington

· 6.3 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Juan County 25 kmIsland County 28 kmSkagit County 75 kmJefferson County 83 kmKitsap County 84 kmClallam County 85 kmSnohomish County 86 kmWhatcom County 88 kmMason County 118 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 1.5 (ml)
Depth
6.3 km below the surface
Felt
no reports yet
Nearest
San Juan County, 25 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 726 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 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 48.3868, -122.8160. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Juan County, WA 25 km (16 mi) ESE of here earthquakes near San Juan County
Island County, WA 28 km (17 mi) NNW of here earthquakes near Island County
Skagit County, WA 75 km (46 mi) W of here earthquakes near Skagit County
Jefferson County, WA 83 km (52 mi) NE of here earthquakes near Jefferson County
Kitsap County, WA 84 km (52 mi) N of here earthquakes near Kitsap County
Clallam County, WA 85 km (53 mi) ENE of here earthquakes near Clallam County

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

Aftershocks so far

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

  1. 2.1 2 km NNE of La Conner, Washington
  2. 2.1 2 km NE of La Conner, Washington
  3. 1.9 2 km NE of La Conner, Washington
  4. 1.9 7 km S of La Conner, Washington
  5. 1.7 3 km NNW of Warm Beach, Washington
  6. 1.6 4 km W of Mount Vernon, Washington
  7. 1.7 4 km W of Mount Vernon, Washington
  8. 1.7 10 km N of Jamestown, Washington
  9. 2.1 6 km WNW of Coupeville, Washington
  10. 2.9 7 km ENE of Marrowstone, Washington
  11. 1.8 2 km ESE of Mount Vernon, Washington
  12. 2.4 2 km ESE of Mount Vernon, Washington
  13. 2.2 2 km SE of Mount Vernon, Washington
  14. 2.9 2 km ESE of Mount Vernon, Washington
  15. 1.5 11 km WNW of Ault Field, 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 4.3 on 2023-10-09 — it released about 16,000 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.