QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9ml

14 km SW of Blyn, Washington

· 42 km deep · released about 10 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Jefferson County 32 kmIsland County 44 kmKitsap County 48 kmClallam County 59 kmMason County 64 kmSan Juan County 65 kmSnohomish County 103 kmGrays Harbor County 104 kmKing County 109 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 3.9 (ml)
Depth
42 km below the surface
Felt
268 reports · strongest reported intensity IV
Measured shaking
intensity III (ShakeMap)
USGS impact alert
green
Nearest
Jefferson County, 32 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 499 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 268 people have reported feeling it to USGS.

How big was it?

This earthquake released about 10 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 16,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 730× the energy of this one
  3. Magna, Utah 2020 M 5.7 520× the energy of this one
  4. This earthquake M 3.9 about 10 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 22× more

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 47.9240, -123.1408. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Jefferson County, WA 32 km (20 mi) ENE of here earthquakes near Jefferson County
Island County, WA 44 km (27 mi) SW of here earthquakes near Island County
Kitsap County, WA 48 km (30 mi) NW of here earthquakes near Kitsap County
Clallam County, WA 59 km (37 mi) ESE of here earthquakes near Clallam County
Mason County, WA 64 km (40 mi) N of here earthquakes near Mason County
San Juan County, WA 65 km (40 mi) S of here earthquakes near San Juan County

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

Aftershocks so far

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

  1. 2.1 6 km NNW of Lofall, Washington
  2. 1.5 11 km N of Hoodsport, Washington
  3. 1.6 2 km W of Port Townsend, Washington
  4. 2.0 8 km W of Gorst, Washington
  5. 1.6 3 km W of Quilcene, Washington
  6. 1.5 5 km WSW of Erlands Point-Kitsap Lake, Washington
  7. 1.7 11 km NW of Belfair, Washington
  8. 1.6 2 km SW of Port Ludlow, Washington
  9. 1.9 14 km WNW of Belfair, Washington
  10. 1.9 6 km SSE of Port Ludlow, Washington
  11. 1.5 6 km SSE of Port Ludlow, Washington
  12. 1.6 5 km SSE of Port Ludlow, Washington
  13. 1.5 3 km SSE of Port Ludlow, Washington
  14. 1.8 10 km S of Victoria, Canada
  15. 1.8 3 km SE of Quilcene, 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 4.3 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.