QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

2 km NNW of Ames Lake, Washington

· 27 km deep · released about 990 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 21 kmSnohomish County 48 kmKitsap County 50 kmPierce County 68 kmIsland County 77 kmSkagit County 95 kmMason County 96 kmThurston County 102 kmChelan County 104 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 3.0 (ml)
Depth
27 km below the surface
Felt
289 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
King County, 21 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 157 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 289 people have reported feeling it to USGS.

How big was it?

This earthquake released about 990 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 340,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 11,000× the energy of this one
  4. This earthquake M 3.0 about 990 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 47.6493, -121.9792. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 21 km (13 mi) NNW of here earthquakes near King County
Snohomish County, WA 48 km (30 mi) SSW of here earthquakes near Snohomish County
Kitsap County, WA 50 km (31 mi) E of here earthquakes near Kitsap County
Pierce County, WA 68 km (42 mi) N of here earthquakes near Pierce County
Island County, WA 77 km (48 mi) SE of here earthquakes near Island County
Skagit County, WA 95 km (59 mi) S of here earthquakes near Skagit County

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

Aftershocks so far

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

  1. 2.1 4 km SW of Wilderness Rim, Washington
  2. 1.7 10 km ESE of Riverbend, Washington
  3. 2.1 4 km NNE of Snoqualmie, Washington
  4. 1.6 1 km NNE of Maple Valley, Washington
  5. 1.7 2 km NNE of May Creek, Washington
  6. 1.5 5 km SSW of Monroe, Washington
  7. 1.5 2 km E of Granite Falls, Washington
  8. 1.5 2 km WNW of Ames Lake, Washington
  9. 1.9 6 km SSE of Lea Hill, Washington
  10. 1.5 5 km WSW of Mercer Island, Washington
  11. 2.2 10 km NNE of Startup, Washington
  12. 1.5 2 km ENE of Granite Falls, Washington
  13. 1.6 15 km ENE of Tanner, Washington
  14. 1.6 3 km E of Granite Falls, Washington
  15. 1.6 2 km SSW of Lake Forest Park, 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 230 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.