QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

2 km WNW of Arlington, Washington

· 63 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Snohomish County 33 kmIsland County 39 kmSkagit County 40 kmKitsap County 73 kmWhatcom County 74 kmSan Juan County 78 kmKing County 83 kmJefferson County 112 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
63 km below the surface
Felt
no reports yet
Nearest
Snohomish County, 33 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 157 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 5.9 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 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 48.2095, -122.1522. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Snohomish County, WA 33 km (21 mi) WNW of here earthquakes near Snohomish County
Island County, WA 39 km (24 mi) E of here earthquakes near Island County
Skagit County, WA 40 km (25 mi) SW of here earthquakes near Skagit County
Kitsap County, WA 73 km (46 mi) NNE of here earthquakes near Kitsap County
Whatcom County, WA 74 km (46 mi) SSW of here earthquakes near Whatcom County
San Juan County, WA 78 km (48 mi) ESE of here earthquakes near San Juan County

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

Aftershocks so far

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

  1. 1.7 2 km E of Granite Falls, Washington
  2. 1.1 6 km NE of Oso, Washington
  3. 0.7 6 km SSE of Concrete, Washington
  4. 1.7 0 km W of Lake Stickney, Washington
  5. 1.6 3 km WSW of Lake Cavanaugh, Washington
  6. 2.6 2 km ENE of Mount Vernon, Washington
  7. 1.6 2 km ESE of Oak Harbor, Washington
  8. 1.5 5 km SSW of Monroe, Washington
  9. 1.9 7 km SSE of Concrete, Washington
  10. 1.5 2 km E of Granite Falls, Washington
  11. 1.9 2 km NNE of Lyman, Washington
  12. 1.6 2 km E of Oak Harbor, Washington
  13. 2.1 3 km E of Oak Harbor, Washington
  14. 1.7 3 km E of Oak Harbor, Washington
  15. 1.7 3 km N of Lyman, 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 38,000 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.