Earthquake · reviewed by a seismologist
M 1.6ml
Earthquake near Bradbury, CA
No earthquake was likely felt in Bradbury in the 24 hours to 4:44 am PST (12:44 UTC). The last one was M 3.8, 78 km (48 mi) WNW, at 8:00 pm PDT on 29 September 2026, estimated intensity II (weak) in town; 199 felt reports to USGS. Every earthquake near Bradbury
This page: a magnitude 1.6 earthquake was recorded 16 km (10 mi) north-northeast of Bradbury, CA, at 4:11 pm PST on 3 January 2024 (00:11 UTC), 11 km deep.
USGS: 16 km NNE of Bradbury, CA
53 km (33 mi) NE of Los Angeles, CA · 18 km (11 mi) NNW of Glendora, CA
- When
- 4:11 pm PST on 3 January 2024 ()
- Where
- 16 km (10 mi) north-northeast of Bradbury, CA · earthquakes near Bradbury
- Magnitude
- M 1.6 (ml)
- Depth
- 11 km below the surface
- Felt
- no reports yet
- Nearest
- Los Angeles County, 32 km WSW
- Nearest mapped fault
- San Gabriel fault, 4 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 1043 days ago
Earthquake alerts for Bradbury, CA
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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 Bradbury, 16 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: Monrovia, Duarte, Azusa, Glendora, Sierra Madre, Arcadia.
How big was it?
This earthquake released about 6.8 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.
- Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
- Around the size people start to feel M 3.0 140× the energy of this one
- This earthquake M 1.6 about 6.8 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 29,000 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 1971 San Fernando Earthquake, California · 43 km WNW of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 29 km SSW of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 43 km WNW of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 43 km WNW of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 6 km WSW 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 34.2890, -117.9308. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 32 km (20 mi) | WSW | earthquakes near Los Angeles County |
| Orange County, CA | 70 km (43 mi) | SSE | earthquakes near Orange County |
| Ventura County, CA | 111 km (69 mi) | W | earthquakes near Ventura County |
| Kern County, CA | 138 km (86 mi) | NNW | earthquakes near Kern County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
39 earthquakes have been recorded within 50 km since this one.
- 1.7 9 km N of Rancho Cucamonga, CA
- 1.6 6 km SSW of Lytle Creek, CA
- 1.7 6 km SSW of Lytle Creek, CA
- 1.7 6 km SSW of Lytle Creek, CA
- 1.8 10 km NNW of Rancho Cucamonga, CA
- 1.6 8 km SSW of Pearblossom, CA
- 1.6 8 km NNE of Rancho Cucamonga, CA
- 1.6 8 km NNE of Rancho Cucamonga, CA
- 1.6 1 km WSW of Devore, CA
- 1.9 3 km N of Fontana, CA
- 2.2 3 km N of Fontana, CA
- 1.7 6 km E of Palmdale, CA
- 1.8 1 km S of La Mirada, CA
- 1.5 2 km NE of East Los Angeles, CA
- 1.6 1 km SW of Rosemead, 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.