QuakeIndex

explosion · reviewed by a seismologist

M 1.8ml

12 km WNW of Mansfield, Washington

· -1.1 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Douglas County 14 kmChelan County 61 kmGrant County 75 kmOkanogan County 78 kmKittitas County 104 kmLincoln County 108 kmFerry County 117 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
-1.1 km below the surface
Felt
no reports yet
Nearest
Douglas County, 14 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 188 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as explosion, not an earthquake.

How big was it?

This earthquake released about 13 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 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 47.8493, -119.7993. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Douglas County, WA 14 km (9 mi) NNW of here earthquakes near Douglas County
Chelan County, WA 61 km (38 mi) E of here earthquakes near Chelan County
Grant County, WA 75 km (47 mi) NNW of here earthquakes near Grant County
Okanogan County, WA 78 km (48 mi) S of here earthquakes near Okanogan County
Kittitas County, WA 104 km (65 mi) NE of here earthquakes near Kittitas County
Lincoln County, WA 108 km (67 mi) WNW of here earthquakes near Lincoln County

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

Aftershocks so far

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

  1. 0.9 5 km ENE of Entiat, Washington
  2. 2.3 4 km NW of Waterville, Washington
  3. 1.7 7 km WSW of Chelan, Washington
  4. 1.9 10 km SSW of Granite Falls, Washington
  5. 1.5 7 km SSE of Chelan Falls, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.