QuakeIndex

explosion · reviewed by a seismologist

M 2.3ml

3 km SSW of Silvana, Washington

· -0.5 km deep · released about 74 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 30 kmSnohomish County 40 kmSkagit County 49 kmKitsap County 66 kmSan Juan County 72 kmWhatcom County 81 kmKing County 83 kmJefferson County 102 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 2.3 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Island County, 30 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1559 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 74 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 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 74 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 48.1767, -122.2712. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 30 km (18 mi) E of here earthquakes near Island County
Snohomish County, WA 40 km (25 mi) WNW of here earthquakes near Snohomish County
Skagit County, WA 49 km (30 mi) SW of here earthquakes near Skagit County
Kitsap County, WA 66 km (41 mi) NNE of here earthquakes near Kitsap County
San Juan County, WA 72 km (45 mi) ESE of here earthquakes near San Juan County
Whatcom County, WA 81 km (50 mi) SSW of here earthquakes near Whatcom County

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

Aftershocks so far

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

  1. 1.8 4 km NNW of Bryant, Washington
  2. 1.6 Puget Sound region, Washington
  3. 1.7 4 km E of Granite Falls, Washington
  4. 1.7 5 km SW of Port Ludlow, Washington
  5. 2.3 6 km WSW of Shoreline, Washington
  6. 1.6 2 km NE of Esperance, Washington
  7. 1.7 Puget Sound region, Washington
  8. 1.9 1 km ENE of Granite Falls, Washington
  9. 1.5 5 km SW of Port Ludlow, Washington
  10. 1.9 2 km SSW of Esperance, Washington
  11. 1.9 4 km ENE of La Conner, Washington
  12. 1.7 1 km ENE of Granite Falls, Washington
  13. 1.6 2 km NNE of Woods Creek, Washington
  14. 1.5 4 km SW of Port Ludlow, Washington
  15. 1.6 0 km SW of Esperance, 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 4.6 on 2019-07-12 — it released about 3,000 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.