QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

18 km E of Foresthill, California

· 16 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Placer County 10 kmEl Dorado County 28 kmNevada County 32 kmSierra County 61 kmAmador County 66 kmYuba County 69 kmCarson City 76 kmAlpine County 84 kmDouglas County 88 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
16 km below the surface
Felt
no reports yet
Nearest
Placer County, 10 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1602 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 39.0344, -120.6102. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Placer County, CA 10 km (6 mi) ESE of here earthquakes near Placer County
El Dorado County, CA 28 km (18 mi) NNW of here earthquakes near El Dorado County
Nevada County, CA 32 km (20 mi) SSE of here earthquakes near Nevada County
Sierra County, CA 61 km (38 mi) S of here earthquakes near Sierra County
Amador County, CA 66 km (41 mi) N of here earthquakes near Amador County
Yuba County, CA 69 km (43 mi) ESE of here earthquakes near Yuba County

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

Aftershocks so far

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

  1. 2.0 4 km WSW of Tahoe Vista, CA
  2. 2.4 4 km N of Dollar Point, CA
  3. 2.1 23 km W of Sunnyside-Tahoe City, CA
  4. 2.2 24 km W of Sunnyside-Tahoe City, CA
  5. 2.1 24 km W of Sunnyside-Tahoe City, CA
  6. 2.3 4km SSE of Truckee, CA
  7. 2.0 22km WNW of Truckee, CA
  8. 1.8 4km WSW of Tahoe Vista, CA
  9. 1.9 4km N of Dollar Point, CA
  10. 1.9 4km WSW of Tahoe Vista, CA
  11. 2.7 21km WNW of Sunnyside-Tahoe City, CA
  12. 2.0 32km WSW of Truckee, CA
  13. 2.2 26km W of Sunnyside-Tahoe City, CA
  14. 1.7 35km WNW of Truckee, CA
  15. 3.3 24km WNW of Truckee, CA

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.