QuakeIndex

Earthquake · reviewed by a seismologist

M 4.1mw

17km ENE of Ojai, CA

· 19 km deep · released about 24 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 19 kmLos Angeles County 83 kmSanta Barbara County 88 kmKern County 97 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 4.1 (mw)
Depth
19 km below the surface
Felt
861 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Ventura County, 19 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1558 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 861 people have reported feeling it to USGS.

How big was it?

This earthquake released about 24 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 7,200× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 320× the energy of this one
  3. Magna, Utah 2020 M 5.7 230× the energy of this one
  4. This earthquake M 4.1 about 24 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 50× 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 34.5217, -119.0748. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ventura County, CA 19 km (12 mi) NNE of here earthquakes near Ventura County
Los Angeles County, CA 83 km (52 mi) WNW of here earthquakes near Los Angeles County
Santa Barbara County, CA 88 km (55 mi) E of here earthquakes near Santa Barbara County
Kern County, CA 97 km (60 mi) SSW of here earthquakes near Kern County
Orange County, CA 152 km (94 mi) NW of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 1.5 4km SSE of Frazier Park, CA
  2. 2.0 14km N of Piru, CA
  3. 1.6 15km ENE of Ojai, CA
  4. 1.6 12km NE of Simi Valley, CA
  5. 1.6 12km NE of Simi Valley, CA
  6. 1.9 9km WSW of Grapevine, CA
  7. 1.8 11km NNW of Piru, CA
  8. 1.9 1km SE of Carpinteria, CA
  9. 1.8 12km SW of Valencia, CA
  10. 2.1 10km NW of Castaic, CA
  11. 1.8 6km NNW of Fillmore, CA
  12. 1.6 6km NNW of Fillmore, CA
  13. 2.2 6km N of Fillmore, CA
  14. 2.4 7km N of Fillmore, CA
  15. 1.7 13km N of Castaic, 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.