Earthquake · reviewed by a seismologist
M 3.5mw
Earthquake near Boron, CA
No earthquake was likely felt in Boron in the 24 hours to 5:30 am PST (13:30 UTC). The last one was M 1.8, 5 km (3 mi) NNW, at 4:15 pm PST on 8 November 2026, estimated intensity II (weak) in town. Every earthquake near Boron
This page: a magnitude 3.5 earthquake was recorded 27 km (17 mi) east-southeast of Boron, CA, at 3:10 pm PST on 28 November 2019 (23:10 UTC), 2.4 km deep. 49 people have reported feeling it to USGS.
USGS: 27km ESE of Boron, CA
39 km (24 mi) N of Victorville, CA · 133 km (83 mi) NE of Los Angeles, CA
- When
- 3:10 pm PST on 28 November 2019 ()
- Where
- 27 km (17 mi) east-southeast of Boron, CA · earthquakes near Boron
- Magnitude
- M 3.5 (mw)
- Depth
- 2.4 km below the surface
- Felt
- 49 reports · strongest reported intensity IV
- Measured shaking
- intensity VI (ShakeMap)
- Nearest
- Los Angeles County, 110 km SW
- Nearest mapped fault
- Helendale-South Lockhart 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 759 days ago
Earthquake alerts for Boron, CA
Get a notification in this browser when USGS records an earthquake near Boron, 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 small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage.
At this magnitude and depth, people at rest would likely notice it out to about 63 km (39 mi) from the epicentre. In Boron, 27 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.
Likely felt in: Boron 27 km, intensity II · Barstow Heights 31 km, intensity II · Barstow 34 km, intensity II · Apple Valley 46 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 2.7 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 63,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 2,800× the energy of this one
- Magna, Utah 2020 M 5.7 2,000× the energy of this one
- This earthquake M 3.5 about 2.7 tons of TNT
- Around the size people start to feel M 3.0 this one released 5.6× more
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 since 1900 lists no earthquake of M5 or more within 50 km.
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 34.8752, -117.3905. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 110 km (68 mi) | SW | earthquakes near Los Angeles County |
| San Bernardino County, CA | 110 km (69 mi) | E | earthquakes near San Bernardino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
57 earthquakes have been recorded within 50 km since this one.
- 1.7 5km NW of Boron, CA
- 1.6 5km NW of Boron, CA
- 1.6 16km NNE of Apple Valley, CA
- 2.3 26km ESE of Boron, CA
- 2.4 27km ESE of Boron, CA
- 1.7 5km NNW of Boron, CA
- 1.8 4km NNW of Boron, CA
- 2.8 12km NE of Barstow, CA
- 1.6 5km NNW of Boron, CA
- 1.8 16 km NNE of Apple Valley, CA
- 1.9 22km NNE of Barstow, CA
- 1.6 16 km NNE of Apple Valley, CA
- 1.7 18km NE of Boron, CA
- 1.8 5km NW of Boron, CA
- 2.0 12km NE of Barstow, 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.