Earthquake · reviewed by a seismologist
M 1.5ml
Earthquake near Rossmoor, CA
No earthquake was likely felt in Rossmoor in the 24 hours to 1:42 pm PST (21:42 UTC). The last one was M 3.2, 9 km (6 mi) W, at 12:44 am PDT on 9 October 2026, estimated intensity III (weak) in town; 1,090 felt reports to USGS. Every earthquake near Rossmoor
This page: a magnitude 1.5 earthquake was recorded 3 km (2 mi) west-northwest of Rossmoor, CA, at 3:14 pm PDT on 5 October 2024 (22:14 UTC), 11 km deep. 2 people have reported feeling it to USGS.
USGS: 3 km WNW of Rossmoor, CA
5 km (3 mi) ENE of Long Beach, CA · 37 km (23 mi) SE of Los Angeles, CA
- When
- 3:14 pm PDT on 5 October 2024 ()
- Where
- 3 km (2 mi) west-northwest of Rossmoor, CA · earthquakes near Rossmoor
- Magnitude
- M 1.5 (ml)
- Depth
- 11 km below the surface
- Felt
- 2 reports · strongest reported intensity III
- Nearest
- Orange County, 34 km ESE
- Nearest mapped fault
- Newport-Inglewood-Rose Canyon fault, 9 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 766 days ago
Earthquake alerts for Rossmoor, CA
Get a notification in this browser when USGS records an earthquake near Rossmoor, CA. No account or email needed.
Alerts are on for .
Not a warning. An alert comes after USGS publishes a quake, usually minutes after the shaking. For early warning use ShakeAlert, through your phone's Wireless Emergency Alerts or the MyShake app.
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 Rossmoor, 3 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: Los Alamitos, Signal Hill, Hawaiian Gardens, Seal Beach, Lakewood, Cypress.
How big was it?
This earthquake released about 6.2 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,700,000× the energy of this one
- Around the size people start to feel M 3.0 150× the energy of this one
- This earthquake M 1.5 about 6.2 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 32,000 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 6.4 The 1933 Long Beach, California Earthquake · 21 km SSE of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 29 km N of this epicentre
- 5.4 5km S of Chino Hills, CA · 36 km ENE of this epicentre
- 5.3 2 km SSW of Santa Monica, California · 42 km WNW of this epicentre
- 5.3 7km W of Newport Beach, CA · 22 km SSE 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 33.7975, -118.1133. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 34 km (21 mi) | ESE | earthquakes near Orange County |
| Los Angeles County, CA | 46 km (29 mi) | NNW | earthquakes near Los Angeles County |
| Ventura County, CA | 113 km (70 mi) | NW | earthquakes near Ventura County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
38 earthquakes have been recorded within 50 km since this one.
- 2.1 3 km NNE of San Pedro, CA
- 2.8 4 km WSW of Alhambra, CA
- 1.6 4 km SSW of South Pasadena, CA
- 1.6 1 km SSE of Inglewood, CA
- 1.9 1 km NE of Inglewood, CA
- 1.5 1 km SE of Inglewood, CA
- 1.6 2 km E of Inglewood, CA
- 2.2 4 km ENE of San Pedro, CA
- 2.0 16 km SSW of San Pedro, CA
- 2.3 4 km SSE of Highland Park, CA
- 1.7 3 km SSE of Highland Park, CA
- 1.5 2 km NNW of Inglewood, CA
- 1.7 4 km S of Highland Park, CA
- 1.6 10 km W of Palos Verdes Estates, CA
- 1.7 2 km NE of Yorba Linda, 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
- The official USGS event page — the source of record for every value above
- Did you feel it? Report it to USGS — reports go to USGS, not to us
- ShakeMap for this event, when USGS has produced one
QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.