QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

1 km NE of Mill Creek, Washington

· 26 km deep · released about 6.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 37 kmKitsap County 43 kmIsland County 48 kmKing County 50 kmSkagit County 74 kmPierce County 91 kmMason County 94 kmSan Juan County 98 kmJefferson County 101 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 1.6 (ml)
Depth
26 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 37 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 639 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 6.4 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 2,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.6 about 6.4 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 47.8708, -122.1837. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 37 km (23 mi) WSW of here earthquakes near Snohomish County
Kitsap County, WA 43 km (27 mi) NE of here earthquakes near Kitsap County
Island County, WA 48 km (30 mi) SE of here earthquakes near Island County
King County, WA 50 km (31 mi) NNW of here earthquakes near King County
Skagit County, WA 74 km (46 mi) SSW of here earthquakes near Skagit County
Pierce County, WA 91 km (57 mi) N of here earthquakes near Pierce County

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

Aftershocks so far

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

  1. 2.0 1 km ENE of Granite Falls, Washington
  2. 1.8 4 km WSW of Clinton, Washington
  3. 1.7 7 km NNE of May Creek, Washington
  4. 1.7 2 km NE of Echo Lake, Washington
  5. 2.8 4 km N of Echo Lake, Washington
  6. 1.6 1 km NNW of Boulevard Park, Washington
  7. 2.1 0 km NNW of Esperance, Washington
  8. 1.7 2 km NNE of Enetai, Washington
  9. 1.6 2 km E of Granite Falls, Washington
  10. 1.6 1 km SW of Burien, Washington
  11. 1.5 5 km S of Port Ludlow, Washington
  12. 1.8 8 km NE of Fall City, Washington
  13. 2.1 4 km WSW of Clinton, Washington
  14. 2.4 10 km NNE of Snoqualmie, Washington
  15. 1.7 9 km ENE of Snoqualmie, 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 35,000 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.