QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

3km E of Simi Valley, CA

· 11 km deep · released about 1,000 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Ventura County 41 kmLos Angeles County 42 kmOrange County 108 kmKern County 120 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 3.0 (ml)
Depth
11 km below the surface
Felt
1486 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Ventura County, 41 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 426 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1486 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,000 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 330,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 15,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 10,000× the energy of this one
  4. This earthquake M 3.0 about 1,000 lb of TNT

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 34.2698, -118.7047. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Ventura County, CA 41 km (25 mi) ESE of here earthquakes near Ventura County
Los Angeles County, CA 42 km (26 mi) WNW of here earthquakes near Los Angeles County
Orange County, CA 108 km (67 mi) NW of here earthquakes near Orange County
Kern County, CA 120 km (74 mi) S of here earthquakes near Kern County

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

Aftershocks so far

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

  1. 2.3 0km ENE of Lennox, CA
  2. 1.7 0km W of Lennox, CA
  3. 1.6 1km S of Inglewood, CA
  4. 1.8 2km ESE of Inglewood, CA
  5. 1.6 1km ENE of Inglewood, CA
  6. 1.9 1km SW of Inglewood, CA
  7. 1.7 0km NW of Lennox, CA
  8. 1.6 1km NNE of Lennox, CA
  9. 1.6 1km SW of Inglewood, CA
  10. 2.0 1km WSW of Inglewood, CA
  11. 2.0 1km E of Lennox, CA
  12. 1.8 1km NNE of Lennox, CA
  13. 1.5 1km NW of Inglewood, CA
  14. 1.6 1km WSW of Inglewood, CA
  15. 2.3 1km ENE of Lennox, 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 4.2 on 2020-07-30 — it released about 53 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.