QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

Earthquake near Lennox, CA

No earthquake was likely felt in Lennox in the 24 hours to 3:36 am PST (11:36 UTC). The last one was M 1.6, 7 km (4 mi) N, at 5:53 pm PST on 10 November 2026, estimated intensity II (weak) in town. Every earthquake near Lennox

This page: a magnitude 3.0 earthquake was recorded in Lennox, CA, at 4:15 am PDT on 5 April 2021 (11:15 UTC), 20 km deep. 1,055 people have reported feeling it to USGS.

USGS: 2km ENE of Lennox, CA

11 km (7 mi) SE of Los Angeles, CA · in Inglewood, CA

4:15 am PDT, Apr 5, 2021 · · 20 km deep · released about 1,100 lb of TNT

Every earthquake near Lennox Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 29 kmOrange County 59 kmVentura County 87 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
4:15 am PDT on 5 April 2021 ()
Where
in Lennox, CA · earthquakes near Lennox
Magnitude
M 3.0 (ml)
Depth
20 km below the surface
Felt
1,055 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Los Angeles County, 29 km NNE
Nearest mapped fault
Newport-Inglewood-Rose Canyon fault, under 1 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 469 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.

At this magnitude and depth, people at rest would likely notice it out to about 33 km (21 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Inglewood 3 km, intensity II · Westmont 3 km, intensity II · Hawthorne 3 km, intensity II · Lawndale 6 km, intensity II · Gardena 6 km, intensity II · Willowbrook 8 km, intensity II · Florence-Graham 9 km, intensity II · Manhattan Beach 9 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 1,100 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 6.7 320,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 14,000× 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 1,100 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.

For this area

The largest earthquake within 50 km since 2016 was M 4.5 on 2020-09-19 — about 180 times the energy of this one.

Before 2016, the USGS record lists 17 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 Northridge, California, earthquake · 35 km NNW of this epicentre
  2. 6.4 The 1933 Long Beach, California Earthquake · 46 km SE of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 27 km ENE of this epicentre
  4. 5.9 1km ENE of Granada Hills, California · 40 km NNW of this epicentre
  5. 5.8 The 1991 Sierra Madre, California Earthquake · 48 km NE of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 33.9422, -118.3348. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Los Angeles County, CA 29 km (18 mi) NNE earthquakes near Los Angeles County
Orange County, CA 59 km (37 mi) ESE earthquakes near Orange County
Ventura County, CA 87 km (54 mi) WNW earthquakes near Ventura County

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

Aftershocks so far

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

  1. 1.8 3km WNW of Lennox, CA
  2. 2.1 0km N of Lennox, CA
  3. 2.3 1km N of Lennox, CA
  4. 1.9 6km WSW of Malibu Beach, CA
  5. 2.4 2km E of Commerce, CA
  6. 1.5 1km SE of Marina del Rey, CA
  7. 1.5 18km S of Malibu Beach, CA
  8. 1.7 16km S of Malibu Beach, CA
  9. 1.9 3km WNW of Lennox, CA
  10. 2.2 1km NNW of Lennox, CA
  11. 1.6 1km SE of Lennox, CA
  12. 2.1 1km SSW of Inglewood, CA
  13. 2.3 1km NE of Lennox, CA
  14. 1.6 2km NW of Lennox, CA
  15. 1.6 2km WSW of Inglewood, 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.