QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

Earthquake near Gardena, CA

No earthquake was likely felt in Gardena in the 24 hours to 4:02 am PST (12:02 UTC). The last one was M 1.8, 2 km (1 mi) ENE, at 2:31 pm PDT on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Gardena

This page: a magnitude 1.7 earthquake was recorded in Gardena, CA, at 11:35 pm PDT on 23 October 2018 (06:35 UTC), 16 km deep.

USGS: 1km SSW of Gardena, CA

18 km (11 mi) SSE of Los Angeles, CA · in Gardena, CA

11:35 pm PDT, Oct 23, 2018 · · 16 km deep · released about 11 lb of TNT

Every earthquake near Gardena Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 36 kmOrange County 55 kmVentura County 92 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
11:35 pm PDT on 23 October 2018 ()
Where
in Gardena, CA · earthquakes near Gardena
Magnitude
M 1.7 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 36 km N
Nearest mapped fault
Newport-Inglewood-Rose Canyon fault, 6 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 2941 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. 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: Alondra Park, Lawndale, West Rancho Dominguez, Torrance, West Athens, Hawthorne.

How big was it?

This earthquake released about 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 15 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.7 Northridge, California, earthquake · 43 km NNW of this epicentre
  2. 6.4 The 1933 Long Beach, California Earthquake · 40 km SE of this epicentre
  3. 5.9 The 1987 Whittier Narrows, California Earthquake · 30 km NE of this epicentre
  4. 5.9 1km ENE of Granada Hills, California · 47 km NNW of this epicentre
  5. 5.3 2 km SSW of Santa Monica, California · 22 km NW 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 33.8768, -118.3162. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Los Angeles County, CA 36 km (22 mi) N earthquakes near Los Angeles County
Orange County, CA 55 km (34 mi) ESE earthquakes near Orange County
Ventura County, CA 92 km (57 mi) NW 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. 1.5 7km ESE of San Pedro, CA
  10. 1.8 6km SW of Sherman Oaks, CA
  11. 1.8 3km ESE of Northridge, CA
  12. 2.0 2km E of Santa Monica, CA
  13. 1.5 3km ESE of Northridge, CA
  14. 2.6 3km ESE of Northridge, CA
  15. 2.6 2km ESE of Santa Monica, 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.