QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

4 km NNE of Snoqualmie, Washington

· 18 km deep · released about 49 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 8 kmSnohomish County 55 kmPierce County 63 kmKitsap County 65 kmIsland County 93 kmChelan County 94 kmKittitas County 97 kmSkagit County 104 kmThurston 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 2.1 (ml)
Depth
18 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
King County, 8 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 49 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 310,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 220,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 49 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 47.5625, -121.7968. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 8 km (5 mi) NNE of here earthquakes near King County
Snohomish County, WA 55 km (34 mi) S of here earthquakes near Snohomish County
Pierce County, WA 63 km (39 mi) NNE of here earthquakes near Pierce County
Kitsap County, WA 65 km (40 mi) E of here earthquakes near Kitsap County
Island County, WA 93 km (58 mi) SE of here earthquakes near Island County
Chelan County, WA 94 km (59 mi) WSW of here earthquakes near Chelan County

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

Aftershocks so far

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

  1. 1.7 0 km W of Wilderness Rim, Washington
  2. 1.2 1 km NW of Lake Marcel-Stillwater, Washington
  3. 1.7 0 km W of Lake Stickney, Washington
  4. 2.1 10 km ENE of Fall City, Washington
  5. 1.0 5 km WSW of Wilderness Rim, Washington
  6. 2.4 5 km SW of Wilderness Rim, Washington
  7. 1.1 2 km NW of Lake Marcel-Stillwater, Washington
  8. 0.8 4 km E of Carnation, Washington
  9. 2.0 3 km ESE of East Renton Highlands, Washington
  10. 0.5 2 km S of Union Hill-Novelty Hill, Washington
  11. 2.1 4 km SW of Wilderness Rim, Washington
  12. 1.7 10 km ESE of Riverbend, 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 4,600 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.