QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

4km W of Manhattan Beach, CA

· 11 km deep · released about 630 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 40 kmOrange County 67 kmVentura County 82 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 2.9 (ml)
Depth
11 km below the surface
Felt
318 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Los Angeles County, 40 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 216 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 318 people have reported feeling it to USGS.

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 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 33.8797, -118.4575. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 40 km (25 mi) SSW of here earthquakes near Los Angeles County
Orange County, CA 67 km (42 mi) WNW of here earthquakes near Orange County
Ventura County, CA 82 km (51 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

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

  1. 1.8 1km WNW of Gardena, CA
  2. 1.5 2km S of Compton, CA
  3. 1.9 1km E of Baldwin Hills, CA
  4. 1.8 19km WSW of Rancho Palos Verdes, CA
  5. 2.1 17km W of Manhattan Beach, CA
  6. 1.6 1km SSE of Carson, CA
  7. 2.0 2km NNE of Sherman Oaks, CA
  8. 1.8 5km WSW of Huntington Beach, CA
  9. 1.8 2km ESE of Granada Hills, CA
  10. 1.5 2km NNW of Rolling Hills Estates, CA
  11. 2.1 2km NNW of Rolling Hills Estates, CA
  12. 1.7 13km WNW of Malibu, CA
  13. 2.0 12km WNW of Malibu, CA
  14. 1.6 5km W of Chatsworth, CA
  15. 2.9 2km WSW 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2020-09-19 — it released about 310 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.