QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

6 km WSW of Port Hadlock-Irondale, Washington

· 20 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Island County 22 kmKitsap County 45 kmJefferson County 54 kmSan Juan County 57 kmClallam County 76 kmMason County 78 kmSnohomish County 83 kmSkagit County 94 kmKing County 97 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
20 km below the surface
Felt
no reports yet
Nearest
Island County, 22 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 658 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× 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 48.0190, -122.8738. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Island County, WA 22 km (13 mi) SW of here earthquakes near Island County
Kitsap County, WA 45 km (28 mi) NNW of here earthquakes near Kitsap County
Jefferson County, WA 54 km (34 mi) ENE of here earthquakes near Jefferson County
San Juan County, WA 57 km (35 mi) SSE of here earthquakes near San Juan County
Clallam County, WA 76 km (47 mi) E of here earthquakes near Clallam County
Mason County, WA 78 km (48 mi) NNE of here earthquakes near Mason County

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

Aftershocks so far

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

  1. 1.5 3 km S of Port Ludlow, Washington
  2. 2.1 8 km E of Port Townsend, Washington
  3. 2.5 6 km SE of Coupeville, Washington
  4. 2.0 3 km SSE of Port Ludlow, Washington
  5. 1.5 6 km ESE of Quilcene, Washington
  6. 1.8 2 km NNE of Keyport, Washington
  7. 1.9 5 km NNE of Port Angeles, Washington
  8. 1.8 4 km WSW of Clinton, Washington
  9. 2.1 0 km NNW of Esperance, Washington
  10. 2.1 4 km WSW of Ault Field, Washington
  11. 2.1 7 km NW of Jamestown, Washington
  12. 2.1 2 km S of River Road, Washington
  13. 1.5 5 km S of Port Ludlow, Washington
  14. 2.1 4 km WSW of Clinton, Washington
  15. 1.5 4 km ESE of Indianola, 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 5,400 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.