QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Omak, WA

USGS: 15 km NW of Conconully, Washington

2:21 pm PST, Dec 23, 2021 · · 0.1 km deep · released about 9 lb of TNT

Every earthquake near Omak Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Okanogan County 16 kmFerry County 102 kmDouglas County 102 kmChelan County 103 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
2:21 pm PST on 23 December 2021 ()
Where
38 km (24 mi) NW of Omak, WA · earthquakes near Omak
Magnitude
M 1.6 (ml)
Depth
0.1 km below the surface
Felt
no reports yet
Nearest
Okanogan County, 16 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1744 days ago

A magnitude 1.6 earthquake was recorded 38 km (24 mi) NW of Omak, WA, at 2:21 pm PST on 23 December 2021 (22:21 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record since 1900 lists no earthquake of M5 or more within 50 km.

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 48.6515, -119.8960. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Okanogan County, WA 16 km (10 mi) SE earthquakes near Okanogan County
Ferry County, WA 102 km (64 mi) E earthquakes near Ferry County
Douglas County, WA 102 km (64 mi) S earthquakes near Douglas County
Chelan County, WA 103 km (64 mi) SSW earthquakes near Chelan County
Lincoln County, WA 162 km (101 mi) SE earthquakes near Lincoln County

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

Aftershocks so far

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

  1. 2.8 8 km ESE of Loomis, Washington
  2. 1.8 13 km NNW of Riverside, Washington
  3. 3.3 9 km ESE of Loomis, Washington
  4. 2.9 8 km E of Loomis, Washington
  5. 1.7 8 km ESE of Loomis, Washington
  6. 2.8 8 km E of Loomis, Washington
  7. 1.9 8 km ESE of Loomis, Washington
  8. 1.5 8 km ESE of Loomis, Washington
  9. 1.8 7 km ESE of Loomis, Washington
  10. 3.1 9 km NW of Tonasket, Washington
  11. 2.1 8 km ESE of Loomis, Washington
  12. 1.6 7 km E of Loomis, Washington
  13. 2.1 7 km ESE of Loomis, Washington
  14. 1.6 7 km ESE of Loomis, Washington
  15. 2.1 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.