Earthquake · reviewed by a seismologist
M 1.5ml
Earthquake near Bradbury, CA
No earthquake was likely felt in Bradbury in the 24 hours to 5:14 am PST (13:14 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 1.5 earthquake was recorded 14 km (8 mi) north of Bradbury, CA, at 2:53 pm PST on 11 February 2023 (22:53 UTC), 10 km deep.
USGS: 14km N of Bradbury, CA
50 km (31 mi) ENE of Los Angeles, CA · 17 km (10 mi) NNE of Arcadia, CA
- When
- 2:53 pm PST on 11 February 2023 ()
- Where
- 14 km (8 mi) north of Bradbury, CA · earthquakes near Bradbury
- Magnitude
- M 1.5 (ml)
- Depth
- 10 km below the surface
- Felt
- no reports yet
- Nearest
- Los Angeles County, 29 km WSW
- Nearest mapped fault
- San Gabriel fault, 2 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 1368 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, people at rest would likely notice it out to about 3 km (2 mi) from the epicentre. In Bradbury, 14 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, Sierra Madre, Azusa, Arcadia, Glendora.
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 14 earthquakes of M5 or more within 50 km; the five largest:
- 6.6 1971 San Fernando Earthquake, California · 41 km WNW of this epicentre
- 5.9 The 1987 Whittier Narrows, California Earthquake · 26 km SSW of this epicentre
- 5.9 1km ENE of Granada Hills, California · 49 km W of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 41 km WNW of this epicentre
- 5.8 10km SSW of Agua Dulce, CA · 41 km WNW 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 34.2687, -117.9557. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 29 km (18 mi) | WSW | earthquakes near Los Angeles County |
| Orange County, CA | 68 km (42 mi) | SSE | earthquakes near Orange County |
| Ventura County, CA | 109 km (67 mi) | W | earthquakes near Ventura County |
| Kern County, CA | 139 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
42 earthquakes have been recorded within 50 km since this one.
- 1.9 6km NE of Sierra Madre, CA
- 2.6 6km NE of Sierra Madre, CA
- 3.1 6km NE of Sierra Madre, CA
- 1.6 2km SW of Sylmar, CA
- 1.6 6km SSW of Pearblossom, CA
- 1.6 4km WNW of Devore, CA
- 1.6 6km S of Littlerock, CA
- 1.5 1km NW of Pico Rivera, CA
- 2.2 5km NNW of Sylmar, CA
- 1.6 5km NNW of Upland, CA
- 1.6 2km S of Lytle Creek, CA
- 1.5 1km WSW of Baldwin Hills, CA
- 2.5 13km N of La Verne, CA
- 1.6 3km S of Lytle Creek, CA
- 1.8 10km E of Santa Clarita, 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.