QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

7 km ENE of Lake Roesiger, Washington

· 14 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 8 kmSkagit County 53 kmKing County 59 kmIsland County 63 kmKitsap County 73 kmWhatcom County 92 kmChelan County 93 kmSan Juan County 108 kmPierce County 110 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 1.8 (ml)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 8 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 628 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 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 48.0172, -121.8490. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 8 km (5 mi) SW of here earthquakes near Snohomish County
Skagit County, WA 53 km (33 mi) S of here earthquakes near Skagit County
King County, WA 59 km (36 mi) N of here earthquakes near King County
Island County, WA 63 km (39 mi) ESE of here earthquakes near Island County
Kitsap County, WA 73 km (45 mi) NE of here earthquakes near Kitsap County
Whatcom County, WA 92 km (57 mi) S of here earthquakes near Whatcom County

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

Aftershocks so far

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

  1. 1.7 1 km E of Granite Falls, Washington
  2. 1.7 4 km S of Monroe, Washington
  3. 2.1 10 km NNE of Snoqualmie, Washington
  4. 1.7 3 km E of Granite Falls, Washington
  5. 2.8 3 km NE of Fall City, Washington
  6. 1.6 3 km WSW of Sammamish, Washington
  7. 1.9 1 km SSE of Echo Lake, Washington
  8. 2.2 2 km SSE of Lake Marcel-Stillwater, Washington
  9. 1.5 3 km E of Granite Falls, Washington
  10. 1.5 2 km ENE of Woods Creek, Washington
  11. 1.9 7 km S of Woods Creek, Washington
  12. 1.8 7 km SW of Swede Heaven, Washington
  13. 2.0 1 km ENE of Granite Falls, Washington
  14. 1.7 7 km NNE of May Creek, Washington
  15. 1.7 2 km NE of Echo Lake, 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 16,000 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.