QuakeIndex

Earthquake · reviewed by a seismologist

M 3.9mw

10km NW of Santa Paula, CA

· 19 km deep · released about 9.3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 6 kmLos Angeles County 84 kmSanta Barbara County 84 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 3.9 (mw)
Depth
19 km below the surface
Felt
1307 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Ventura County, 6 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 781 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1307 people have reported feeling it to USGS.

How big was it?

This earthquake released about 9.3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.9 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 18,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 810× the energy of this one
  3. Magna, Utah 2020 M 5.7 580× the energy of this one
  4. This earthquake M 3.9 about 9.3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 19× 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 34.4172, -119.1323. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ventura County, CA 6 km (4 mi) N of here earthquakes near Ventura County
Los Angeles County, CA 84 km (52 mi) WNW of here earthquakes near Los Angeles County
Santa Barbara County, CA 84 km (52 mi) E of here earthquakes near Santa Barbara County
Kern County, CA 110 km (68 mi) SSW of here earthquakes near Kern County

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

Aftershocks so far

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

  1. 1.6 5km WSW of Oxnard, CA
  2. 1.8 20km SSE of Port Hueneme, CA
  3. 1.7 8km WSW of Santa Paula, CA
  4. 1.7 4km SW of Santa Paula, CA
  5. 1.7 4km WSW of Ojai, CA
  6. 2.5 19km SSE of Port Hueneme, CA
  7. 2.0 19km SSE of Port Hueneme, CA
  8. 1.7 4km SSW of Frazier Park, CA
  9. 1.7 4km WSW of Ojai, CA
  10. 1.9 13km NNE of Piru, CA
  11. 1.5 10km NNW of Santa Paula, CA
  12. 2.2 6km NNE of Ojai, CA
  13. 2.3 5km WSW of Ojai, CA
  14. 2.5 5km WSW of Ojai, CA
  15. 1.7 12km NNW of Piru, 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 4.1 on 2016-03-12 — it released about 2.5 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.