QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

1km NW of Chatsworth, CA

· 6.3 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 33 kmVentura County 49 kmOrange County 101 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 3.1 (ml)
Depth
6.3 km below the surface
Felt
1425 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Los Angeles County, 33 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 960 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 1425 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 230,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 10,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,400× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× 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 34.2620, -118.6093. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 33 km (20 mi) WNW of here earthquakes near Los Angeles County
Ventura County, CA 49 km (31 mi) ESE of here earthquakes near Ventura County
Orange County, CA 101 km (63 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

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

  1. 1.7 0km NNW of San Fernando, CA
  2. 2.6 1km ESE of Sylmar, CA
  3. 1.5 1km SW of Sylmar, CA
  4. 2.7 1km SSE of Sylmar, CA
  5. 3.7 1km NNE of San Fernando, CA
  6. 2.1 1km SE of Sylmar, CA
  7. 1.9 1km NW of San Fernando, CA
  8. 3.1 1km N of San Fernando, CA
  9. 2.1 1km NNW of San Fernando, CA
  10. 2.1 1km ESE of Sylmar, CA
  11. 1.9 1km W of Sylmar, CA
  12. 2.1 1km WSW of Sylmar, CA
  13. 2.4 1km WSW of Sylmar, CA
  14. 2.5 1km WSW of Sylmar, CA
  15. 4.2 1km SE of Sylmar, 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.