QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

18km S of Johnsville, CA

· -1.9 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sierra County 18 kmNevada County 36 kmPlumas County 43 kmPlacer County 62 kmYuba County 65 kmButte County 75 kmEl Dorado County 94 kmCarson City 99 kmStorey County 105 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 (md)
Depth
-1.9 km below the surface
Felt
no reports yet
Nearest
Sierra County, 18 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3144 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 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× 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 39.6158, -120.7272. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sierra County, CA 18 km (11 mi) WNW of here earthquakes near Sierra County
Nevada County, CA 36 km (22 mi) N of here earthquakes near Nevada County
Plumas County, CA 43 km (27 mi) SSE of here earthquakes near Plumas County
Placer County, CA 62 km (38 mi) N of here earthquakes near Placer County
Yuba County, CA 65 km (41 mi) NE of here earthquakes near Yuba County
Butte County, CA 75 km (47 mi) E of here earthquakes near Butte County

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

Aftershocks so far

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

  1. 2.9 4km SE of Taylorsville, CA
  2. 1.6 8 km SSE of Taylorsville, California
  3. 1.6 9 km SSE of Taylorsville, California
  4. 2.6 6km SE of Taylorsville, CA
  5. 1.7 6 km SSE of Taylorsville, California
  6. 1.6 6 km SSE of Taylorsville, California
  7. 1.5 4 km SSE of Taylorsville, California
  8. 2.5 4km SE of Taylorsville, CA
  9. 2.4 4km SSE of Taylorsville, CA
  10. 1.8 7km NE of East Quincy, CA
  11. 2.4 4km SE of Taylorsville, CA
  12. 1.5 2 km SE of Johnsville, California
  13. 2.1 4km SE of Taylorsville, CA
  14. 2.4 4km ESE of Taylorsville, CA
  15. 1.9 4km SE of Taylorsville, 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

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