QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

11 km NE of May Creek, Washington

· 2.5 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 21 kmKing County 52 kmSkagit County 66 kmChelan County 71 kmIsland County 87 kmKitsap County 87 kmWhatcom County 104 kmPierce County 107 kmKittitas County 111 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 1.5 (ml)
Depth
2.5 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 21 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 902 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 6.2 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 2,500,000× 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 1.5 about 6.2 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 47.9227, -121.5605. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 21 km (13 mi) SE of here earthquakes near Snohomish County
King County, WA 52 km (32 mi) NNE of here earthquakes near King County
Skagit County, WA 66 km (41 mi) SSE of here earthquakes near Skagit County
Chelan County, WA 71 km (44 mi) W of here earthquakes near Chelan County
Island County, WA 87 km (54 mi) ESE of here earthquakes near Island County
Kitsap County, WA 87 km (54 mi) ENE of here earthquakes near Kitsap 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. 1.7 2 km NE of Echo Lake, Washington
  2. 2.8 4 km N of Echo Lake, Washington
  3. 1.6 2 km E of Granite Falls, Washington
  4. 1.8 8 km NE of Fall City, Washington
  5. 2.4 10 km NNE of Snoqualmie, Washington
  6. 1.7 9 km ENE of Snoqualmie, Washington
  7. 2.4 2 km N of City of Sammamish, Washington
  8. 1.6 3 km SSW of Monroe, Washington
  9. 1.6 4 km WSW of Darrington, Washington
  10. 1.7 2 km ENE of Granite Falls, Washington
  11. 2.1 7 km ENE of Fall City, Washington
  12. 3.3 8 km NNE of Snoqualmie, Washington
  13. 2.4 8 km ENE of Fall City, Washington
  14. 1.5 2 km SSW of Monroe, Washington
  15. 2.1 7 km ENE 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 36,000 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.