QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

Earthquake near Lennox, CA

No earthquake was likely felt in Lennox in the 24 hours to 3:00 am PST (11:00 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 1.8 earthquake was recorded 2 km (1 mi) northwest of Lennox, CA, at 5:10 pm PDT on 20 September 2018 (00:10 UTC), 20 km deep. 1 person has reported feeling it to USGS.

USGS: 2km NW of Lennox, CA

9 km (5 mi) SSE of Los Angeles, CA · in Inglewood, CA

5:10 pm PDT, Sep 20, 2018 · · 20 km deep · released about 17 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 63 kmVentura County 84 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
5:10 pm PDT on 20 September 2018 ()
Where
2 km (1 mi) northwest of Lennox, CA · earthquakes near Lennox
Magnitude
M 1.8 (ml)
Depth
20 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
Los Angeles County, 29 km NNE
Nearest mapped fault
Newport-Inglewood-Rose Canyon fault, 3 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 2942 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth it was probably too small to be felt, even directly above it. In Lennox, 2 km away, the estimate is intensity II (weak). 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.

Earthquakes near other towns within 30 km: Inglewood, Del Aire, Hawthorne, El Segundo, Westmont, West Athens.

How big was it?

This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 18 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 Northridge, California, earthquake · 33 km NNW of this epicentre
  2. 6.4 The 1933 Long Beach, California Earthquake · 49 km SE of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 30 km ENE of this epicentre
  4. 5.9 1km ENE of Granada Hills, California · 38 km NNW of this epicentre
  5. 5.8 The 1991 Sierra Madre, California Earthquake · 50 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 33.9498, -118.3697. 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 63 km (39 mi) ESE earthquakes near Orange County
Ventura County, CA 84 km (52 mi) WNW earthquakes near Ventura 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 17km WSW of Rancho Palos Verdes, CA
  2. 1.8 1km NE of Granada Hills, CA
  3. 2.8 3km ESE of Northridge, CA
  4. 2.1 4km S of Marina del Rey, CA
  5. 2.4 20km S of San Pedro, CA
  6. 1.9 20km SSE of San Pedro, CA
  7. 2.1 2km SSW of View Park-Windsor Hills, CA
  8. 1.5 2km SW of View Park-Windsor Hills, CA
  9. 2.8 7km NW of Malibu, CA
  10. 1.5 7km ESE of San Pedro, CA
  11. 1.8 6km SW of Sherman Oaks, CA
  12. 1.8 3km ESE of Northridge, CA
  13. 2.0 2km E of Santa Monica, CA
  14. 1.5 3km ESE of Northridge, CA
  15. 2.6 3km ESE of Northridge, 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.