QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

11 km SW of Index, Washington

· 13 km deep · released about 330 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N King County 32 kmSnohomish County 34 kmKitsap County 75 kmChelan County 79 kmSkagit County 83 kmPierce County 86 kmIsland County 87 kmKittitas County 102 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 2.7 (ml)
Depth
13 km below the surface
Felt
85 reports · strongest reported intensity III
Nearest
King County, 32 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2136 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 85 people have reported feeling it to USGS.

How big was it?

This earthquake released about 330 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 46,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 33,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.9× the energy of this one
  4. This earthquake M 2.7 about 330 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 47.7518, -121.6663. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
King County, WA 32 km (20 mi) NNE of here earthquakes near King County
Snohomish County, WA 34 km (21 mi) SSE of here earthquakes near Snohomish County
Kitsap County, WA 75 km (46 mi) E of here earthquakes near Kitsap County
Chelan County, WA 79 km (49 mi) W of here earthquakes near Chelan County
Skagit County, WA 83 km (52 mi) S of here earthquakes near Skagit County
Pierce County, WA 86 km (53 mi) NNE of here earthquakes near Pierce County

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

Aftershocks so far

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

  1. 1.7 6 km ENE of Lake Roesiger, Washington
  2. 1.7 1 km NNE of Woods Creek, Washington
  3. 2.2 2 km SSE of Carnation, Washington
  4. 1.9 13 km S of May Creek, Washington
  5. 1.5 1 km SSW of Carnation, Washington
  6. 1.9 5 km NW of North Sultan, Washington
  7. 1.6 4 km SSW of May Creek, Washington
  8. 1.5 3 km NE of Fall City, Washington
  9. 2.0 3 km ENE of Granite Falls, Washington
  10. 2.4 11 km E of Tanner, Washington
  11. 1.6 5 km NNE of Woods Creek, Washington
  12. 1.9 1 km NW of West Lake Sammamish, Washington
  13. 2.5 17 km E of Carnation, Washington
  14. 1.5 4 km N of Woods Creek, Washington
  15. 1.9 3 km NNW of Fall City, 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 680 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.