QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mw

7 km ESE of Ojai, CA

· 6.9 km deep · released about 16 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 8 kmSanta Barbara County 81 kmLos Angeles County 87 kmKern County 110 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
6.9 km below the surface
Felt
789 reports · strongest reported intensity V
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Nearest
Ventura County, 8 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 706 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 789 people have reported feeling it to USGS.

How big was it?

This earthquake released about 16 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 10,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 470× the energy of this one
  3. Magna, Utah 2020 M 5.7 330× the energy of this one
  4. This earthquake M 4.0 about 16 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 34× 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 34.4215, -119.1697. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ventura County, CA 8 km (5 mi) NNW of here earthquakes near Ventura County
Santa Barbara County, CA 81 km (50 mi) E of here earthquakes near Santa Barbara County
Los Angeles County, CA 87 km (54 mi) WNW of here earthquakes near Los Angeles County
Kern County, CA 110 km (69 mi) SSW of here earthquakes near Kern County
San Luis Obispo County, CA 159 km (99 mi) SE of here earthquakes near San Luis Obispo County

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

Aftershocks so far

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

  1. 1.6 11 km NW of Malibu, CA
  2. 1.9 11 km WNW of Malibu, CA
  3. 1.7 12 km NW of Malibu, CA
  4. 1.5 10 km WNW of Malibu, CA
  5. 1.9 9 km NW of Malibu, CA
  6. 2.1 11 km WNW of Malibu, CA
  7. 1.6 11 km WNW of Malibu, CA
  8. 3.1 11 km WNW of Malibu, CA
  9. 1.5 11 km WNW of Malibu, CA
  10. 1.5 10 km WNW of Malibu, CA
  11. 2.6 10 km WNW of Malibu, CA
  12. 2.2 11 km NW of Malibu, CA
  13. 1.8 8 km WNW of Malibu, CA
  14. 1.8 12 km WNW of Malibu, CA
  15. 2.0 10 km WNW of Malibu, 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 5.1 on 2023-08-20 — it released about 39 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.