QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

5 km NNW of North Sultan, Washington

· 15 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 15 kmKing County 48 kmSkagit County 63 kmIsland County 68 kmKitsap County 69 kmChelan County 90 kmPierce County 100 kmWhatcom County 102 kmSan Juan County 114 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
15 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Snohomish County, 15 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1990 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 5.6 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 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 47.9263, -121.8285. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 15 km (9 mi) SSW of here earthquakes near Snohomish County
King County, WA 48 km (30 mi) N of here earthquakes near King County
Skagit County, WA 63 km (39 mi) S of here earthquakes near Skagit County
Island County, WA 68 km (42 mi) ESE of here earthquakes near Island County
Kitsap County, WA 69 km (43 mi) ENE of here earthquakes near Kitsap County
Chelan County, WA 90 km (56 mi) W of here earthquakes near Chelan County

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

Aftershocks so far

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

  1. 1.5 1 km ENE of Granite Falls, Washington
  2. 1.7 2 km ENE of Granite Falls, Washington
  3. 1.6 3 km S of Monroe, Washington
  4. 1.6 8 km NE of Tanner, Washington
  5. 2.2 9 km NNE of Snoqualmie, Washington
  6. 1.7 2 km WSW of Woods Creek, Washington
  7. 1.8 0 km NNE of Woods Creek, Washington
  8. 2.8 8 km NW of Verlot, Washington
  9. 1.5 1 km SSW of Lynnwood, Washington
  10. 1.7 1 km ENE of Granite Falls, Washington
  11. 1.6 10 km NNE of Snoqualmie, Washington
  12. 1.6 2 km S of Monroe, Washington
  13. 1.5 2 km ENE of Granite Falls, Washington
  14. 1.8 1 km SW of Snoqualmie, Washington
  15. 1.7 2 km E of Lake Stevens, 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 40,000 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.