QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

7 km WSW of Snoqualmie, Washington

· 12 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 6 kmPierce County 53 kmKitsap County 58 kmSnohomish County 63 kmIsland County 93 kmThurston County 93 kmMason County 96 kmKittitas County 102 kmChelan County 105 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 3.1 (ml)
Depth
12 km below the surface
Felt
257 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
King County, 6 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 215 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 257 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 47.4947, -121.9082. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 6 km (3 mi) W of here earthquakes near King County
Pierce County, WA 53 km (33 mi) NNE of here earthquakes near Pierce County
Kitsap County, WA 58 km (36 mi) ESE of here earthquakes near Kitsap County
Snohomish County, WA 63 km (39 mi) S of here earthquakes near Snohomish County
Island County, WA 93 km (58 mi) SE of here earthquakes near Island County
Thurston County, WA 93 km (58 mi) NE of here earthquakes near Thurston 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. 2.1 7 km ENE of Fall City, Washington
  2. 3.5 9 km NE of Snoqualmie, Washington
  3. 1.8 7 km NE of Fall City, Washington
  4. 1.7 3 km ENE of Buckley, Washington
  5. 1.5 5 km E of Carnation, Washington
  6. 1.6 1 km NE of Mill Creek, Washington
  7. 2.2 3 km SW of Roosevelt, Washington
  8. 1.8 11 km ESE of Enumclaw, Washington
  9. 2.4 5 km ENE of Tanner, Washington
  10. 1.6 1 km SW of Burien, Washington
  11. 1.6 3 km SSE of Issaquah, Washington
  12. 1.7 2 km N of White Center, Washington
  13. 1.6 3 km SSE of Issaquah, Washington
  14. 2.1 3 km SSE of Issaquah, Washington
  15. 1.6 3 km SSE of Issaquah, 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 150 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.