QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

12 km E of Floriston, California

· 7.7 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Carson City 28 kmStorey County 31 kmDouglas County 58 kmSierra County 59 kmLyon County 71 kmNevada County 77 kmPlacer County 81 kmAlpine County 85 kmEl Dorado 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
7.7 km below the surface
Felt
no reports yet
Nearest
Carson City, 28 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1251 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 39.3874, -119.8780. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Carson City, NV 28 km (18 mi) NNW of here earthquakes near Carson City
Storey County, NV 31 km (19 mi) W of here earthquakes near Storey County
Douglas County, NV 58 km (36 mi) NNW of here earthquakes near Douglas County
Sierra County, CA 59 km (37 mi) ESE of here earthquakes near Sierra County
Lyon County, NV 71 km (44 mi) NW of here earthquakes near Lyon County
Nevada County, CA 77 km (48 mi) E of here earthquakes near Nevada 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. 1.7 4 km E of Spanish Springs, Nevada
  2. 2.1 5 km E of Spanish Springs, Nevada
  3. 1.6 5 km ESE of Spanish Springs, Nevada
  4. 2.1 Nevada
  5. 3.0 5 km ESE of Spanish Springs, Nevada
  6. 1.9 5 km E of Spanish Springs, Nevada
  7. 2.1 5 km ESE of Spanish Springs, Nevada
  8. 2.3 4 km E of Spanish Springs, Nevada
  9. 2.6 4 km E of Spanish Springs, Nevada
  10. 2.0 4 km E of Spanish Springs, Nevada
  11. 3.1 5 km E of Spanish Springs, Nevada
  12. 2.2 4 km ESE of Spanish Springs, Nevada
  13. 3.4 4 km E of Spanish Springs, Nevada
  14. 2.3 7 km S of Cold Springs, Nevada
  15. 1.6 Nevada

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 4.7 on 2021-05-07 — it released about 19,000 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.