QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mw

6km ESE of Ridgecrest, CA

· 4.8 km deep · released about 17 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Kern County 105 kmInyo County 108 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 4.0 (mw)
Depth
4.8 km below the surface
Felt
12 reports · strongest reported intensity IV
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Nearest
Kern County, 105 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2321 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 12 people have reported feeling it to USGS.

How big was it?

This earthquake released about 17 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 9,800× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 440× the energy of this one
  3. Magna, Utah 2020 M 5.7 310× the energy of this one
  4. This earthquake M 4.0 about 17 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 36× 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 35.6012, -117.6107. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Kern County, CA 105 km (65 mi) ENE of here earthquakes near Kern County
Inyo County, CA 108 km (67 mi) S of here earthquakes near Inyo County
Tulare County, CA 126 km (79 mi) ESE of here earthquakes near Tulare County

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

Aftershocks so far

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

  1. 1.9 15km SW of Searles Valley, CA
  2. 2.0 12km SW of Searles Valley, CA
  3. 2.1 8km ESE of Ridgecrest, CA
  4. 1.6 7km E of Ridgecrest, CA
  5. 1.7 12km WSW of Searles Valley, CA
  6. 2.0 7km E of Ridgecrest, CA
  7. 2.6 14km W of Searles Valley, CA
  8. 4.0 10km SW of Searles Valley, CA
  9. 2.3 12km WSW of Searles Valley, CA
  10. 1.6 8km ESE of Ridgecrest, CA
  11. 2.8 14km WSW of Searles Valley, CA
  12. 2.5 12km SW of Searles Valley, CA
  13. 1.7 15km WSW of Searles Valley, CA
  14. 1.6 14km ENE of Ridgecrest, CA
  15. 2.2 13km WSW of Searles Valley, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 6.4 on 2019-07-04 — it released about 3,500 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.