Earthquake · reviewed by a seismologist
M 2.3ml
Earthquake near Boron, CA
No earthquake was likely felt in Boron in the 24 hours to 6:12 am PST (14:12 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 2.3 earthquake was recorded 27 km (17 mi) east-southeast of Boron, CA, at 5:33 pm PDT on 20 September 2017 (00:33 UTC), 4.9 km deep.
USGS: 27km ESE of Boron, CA
39 km (24 mi) N of Victorville, CA · 134 km (83 mi) NE of Los Angeles, CA
- When
- 5:33 pm PDT on 20 September 2017 ()
- Where
- 27 km (17 mi) east-southeast of Boron, CA · earthquakes near Boron
- Magnitude
- M 2.3 (ml)
- Depth
- 4.9 km below the surface
- Felt
- no reports yet
- 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 3304 days ago
Earthquake alerts for Boron, 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 19 km (12 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.
Earthquakes near other towns within 30 km: Silver Lakes, Lenwood.
How big was it?
This earthquake released about 77 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
- Magna, Utah 2020 M 5.7 140,000× the energy of this one
- Around the size people start to feel M 3.0 12× the energy of this one
- This earthquake M 2.3 about 77 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
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 34.8757, -117.3893. 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 (68 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
58 earthquakes have been recorded within 50 km since this one.
- 1.6 5km NW of Boron, CA
- 1.6 18km E of Boron, CA
- 1.5 15km NNE of Apple Valley, CA
- 2.0 19km E of Boron, CA
- 1.9 5km NW of Boron, CA
- 2.1 19km E of Boron, CA
- 1.8 5km NNW of Boron, CA
- 1.7 5km NW of Boron, CA
- 1.7 14km NNE of Apple Valley, CA
- 2.0 26km ESE of Johannesburg, CA
- 1.6 5km N of Boron, CA
- 1.7 6km N of Boron, CA
- 1.6 5km NNW of Boron, CA
- 1.9 5km N of Boron, CA
- 1.6 4km NNW of Boron, 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.