QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

23km SSW of Seal Beach, CA

· 12 km deep · released about 3 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 39 kmLos Angeles County 73 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 3.5 (mw)
Depth
12 km below the surface
Felt
305 reports · strongest reported intensity IV
Measured shaking
intensity II (ShakeMap)
Nearest
Orange County, 39 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 710 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 305 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 57,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,800× the energy of this one
  4. This earthquake M 3.5 about 3 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.2× 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 33.5463, -118.1717. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 39 km (24 mi) WSW of here earthquakes near Orange County
Los Angeles County, CA 73 km (45 mi) S of here earthquakes near Los Angeles County
Ventura County, CA 127 km (79 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

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

  1. 1.6 2km NNE of Laguna Niguel, CA
  2. 1.7 17km SW of Dana Point, CA
  3. 1.6 3km SSW of Willowbrook, CA
  4. 2.7 12km W of Manhattan Beach, CA
  5. 1.7 2km ENE of Villa Park, CA
  6. 2.0 4km SSE of Yorba Linda, CA
  7. 2.2 4km ESE of Gardena, CA
  8. 2.0 26km SW of Laguna Beach, CA
  9. 1.5 1km W of Willowbrook, CA
  10. 2.0 4km NNW of Villa Park, CA
  11. 2.3 5km E of Seal Beach, CA
  12. 1.7 4km S of Huntington Beach, CA
  13. 1.6 1km SE of Compton, CA
  14. 1.8 15km S of Rancho Palos Verdes, CA
  15. 2.1 15km S of Rancho Palos Verdes, 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.