QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

21km W of Johannesburg, CA

· 2.6 km deep · released about 1,700 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kern County 78 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 3.2 (ml)
Depth
2.6 km below the surface
Felt
11 reports · strongest reported intensity II
Nearest
Kern County, 78 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2719 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,700 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 200,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 8,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,200× the energy of this one
  4. This earthquake M 3.2 about 1,700 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.8× more

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 35.3650, -117.8708. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kern County, CA 78 km (48 mi) E of here earthquakes near Kern County
Tulare County, CA 126 km (79 mi) SE of here earthquakes near Tulare County
Ventura County, CA 161 km (100 mi) NE of here earthquakes near Ventura County

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

Aftershocks so far

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

  1. 1.6 5km N of Boron, CA
  2. 1.8 4km NNW of Boron, CA
  3. 2.2 5km NNW of Boron, CA
  4. 1.6 5km NNW of Boron, CA
  5. 1.8 4km NW of Boron, CA
  6. 2.2 17km SE of Bodfish, CA
  7. 1.8 6km N of Boron, CA
  8. 1.5 5km NNW of Boron, CA
  9. 2.0 5km NNW of Boron, CA
  10. 1.7 15km NNE of Inyokern, CA
  11. 1.5 22km ESE of Lake Isabella, CA
  12. 1.7 5km NW of Boron, CA
  13. 2.1 22km ESE of Lake Isabella, CA
  14. 1.8 23km WNW of Inyokern, CA
  15. 2.0 6km NNW of Boron, 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.