QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

Earthquake near Rolling Hills, CA

No earthquake was likely felt in Rolling Hills in the 24 hours to 3:55 am PST (11:55 UTC). The last one was M 3.2, 16 km (10 mi) ENE, at 12:44 am PDT on 9 October 2026, estimated intensity III (weak) in town; 1,090 felt reports to USGS. Every earthquake near Rolling Hills

This page: a magnitude 1.6 earthquake was recorded in Rolling Hills, CA, at 9:41 am PST on 27 January 2021 (17:41 UTC), 14 km deep.

USGS: 1km E of Rolling Hills, CA

30 km (18 mi) SSE of Los Angeles, CA · 8 km (5 mi) S of Torrance, CA

9:41 am PST, Jan 27, 2021 · · 14 km deep · released about 8.1 lb of TNT

Every earthquake near Rolling Hills Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 49 kmOrange County 53 kmVentura County 99 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
9:41 am PST on 27 January 2021 ()
Where
in Rolling Hills, CA · earthquakes near Rolling Hills
Magnitude
M 1.6 (ml)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 49 km N
Nearest mapped fault
Palos Verdes 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 2115 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: Rolling Hills Estates, Rancho Palos Verdes, Lomita, Palos Verdes Estates, West Carson, Torrance.

How big was it?

This earthquake released about 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 24,000 times the energy of this one.

Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.4 The 1933 Long Beach, California Earthquake · 35 km ESE of this epicentre
  2. 5.9 The 1987 Whittier Narrows, California Earthquake · 42 km NE of this epicentre
  3. 5.3 2 km SSW of Santa Monica, California · 31 km NNW of this epicentre
  4. 5.3 7km W of Newport Beach, CA · 35 km ESE of this epicentre
  5. 5.2 1 km SW of Las Flores, California · 41 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 33.7583, -118.3432. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Los Angeles County, CA 49 km (31 mi) N earthquakes near Los Angeles County
Orange County, CA 53 km (33 mi) E earthquakes near Orange County
Ventura County, CA 99 km (61 mi) NW earthquakes near Ventura County

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

Aftershocks so far

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

  1. 1.7 0km W of Lennox, CA
  2. 1.6 1km S of Inglewood, CA
  3. 1.9 2km E of Lennox, CA
  4. 1.8 2km ESE of Inglewood, CA
  5. 1.6 1km ENE of Inglewood, CA
  6. 2.0 1km SE of Lennox, CA
  7. 1.9 1km SW of Inglewood, CA
  8. 1.7 0km NW of Lennox, CA
  9. 1.6 1km NNE of Lennox, CA
  10. 1.6 1km SW of Inglewood, CA
  11. 2.0 1km WSW of Inglewood, CA
  12. 2.0 1km E of Lennox, CA
  13. 1.8 1km NNE of Lennox, CA
  14. 1.5 1km NW of Inglewood, CA
  15. 1.6 1km 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.