QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

13 km NNW of Riverside, Washington

· 6.3 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Okanogan County 15 kmFerry County 78 kmDouglas County 98 kmChelan County 115 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
6.3 km below the surface
Felt
no reports yet
Nearest
Okanogan County, 15 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 305 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 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× 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 48.6148, -119.5658. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Okanogan County, WA 15 km (9 mi) ENE of here earthquakes near Okanogan County
Ferry County, WA 78 km (48 mi) WNW of here earthquakes near Ferry County
Douglas County, WA 98 km (61 mi) N of here earthquakes near Douglas County
Chelan County, WA 115 km (71 mi) NE of here earthquakes near Chelan County
Lincoln County, WA 143 km (89 mi) NW 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. 2.2 8 km E of Loomis, Washington
  2. 1.6 8 km ESE of Loomis, Washington
  3. 1.6 9 km WNW of Okanogan, Washington
  4. 1.8 9 km ESE of Loomis, Washington
  5. 2.8 8 km ESE of Loomis, 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.