QuakeIndex

Earthquake · reviewed by a seismologist

M 3.2ml

21km S of San Pedro, CA

· 11 km deep · released about 1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 52 kmLos Angeles County 72 kmVentura County 118 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 3.2 (ml)
Depth
11 km below the surface
Felt
132 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Orange County, 52 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2402 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 132 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 170,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 7,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 5,200× the energy of this one
  4. This earthquake M 3.2 about 1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 2.1× 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 33.5485, -118.3142. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 52 km (32 mi) WSW of here earthquakes near Orange County
Los Angeles County, CA 72 km (45 mi) S of here earthquakes near Los Angeles County
Ventura County, CA 118 km (73 mi) SE of here earthquakes near Ventura County

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

Aftershocks so far

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

  1. 1.9 14km SSW of Huntington Beach, CA
  2. 1.8 6km WSW of Huntington Beach, CA
  3. 2.3 14km N of Avalon, CA
  4. 2.2 1km NNW of Newport Beach, CA
  5. 2.1 2km E of Lennox, CA
  6. 1.9 2km ESE of Lennox, CA
  7. 1.6 1km NNE of Lennox, CA
  8. 1.6 1km NNE of Lennox, CA
  9. 1.9 4km SSW of Huntington Beach, CA
  10. 1.9 3 km E of Lennox, CA
  11. 2.2 3km SE of San Pedro, CA
  12. 1.9 2km NNE of Gardena, CA
  13. 1.9 13km WSW of Hermosa Beach, CA
  14. 2.1 12km SSE of San Pedro, CA
  15. 1.5 0km ESE of Redondo Beach, 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.