Earthquake · reviewed by a seismologist
M 0.5ml
Earthquake near Wrightwood, CA
USGS: 12 km WSW of Wrightwood, CA
69 km (43 mi) ENE of Los Angeles, CA · 21 km (13 mi) NNE of Glendora, CA
- When
- 11:58 pm PDT on 28 September 2026 ()
- Where
- 12 km (7 mi) WSW of Wrightwood, CA · earthquakes near Wrightwood
- Magnitude
- M 0.5 (ml)
- Depth
- 6.3 km below the surface
- Felt
- no reports yet
- Nearest
- Los Angeles County, 49 km WSW
- Nearest mapped fault
- San Gabriel fault, 6 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 4 days ago
A magnitude 0.5 earthquake was recorded 12 km (7 mi) WSW of Wrightwood, CA, at 11:58 pm PDT on 28 September 2026 (06:58 UTC). This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.
Earthquakes near other towns within 30 km: Piñon Hills, San Antonio Heights, Phelan, Glendora, San Dimas, La Verne.
How big was it?
This earthquake released about 0.15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 1.5 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 99,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 70,000,000× the energy of this one
- Around the size people start to feel M 3.0 6,200× the energy of this one
- This earthquake M 0.5 about 0.15 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 1,300,000 times the energy of this one.
Before 2016, the USGS record lists 8 earthquakes of M5 or more within 50 km; the five largest:
- 5.9 The 1987 Whittier Narrows, California Earthquake · 41 km SW of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 23 km W of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 19 km SSE of this epicentre
- 5.4 5km S of Chino Hills, CA · 40 km S of this epicentre
- 5.2 3km W of Lytle Creek, CA · 21 km ESE 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 34.3102, -117.7487. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 49 km (30 mi) | WSW | earthquakes near Los Angeles County |
| Orange County, CA | 71 km (44 mi) | S | earthquakes near Orange County |
| Kern County, CA | 146 km (91 mi) | NW | earthquakes near Kern County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
9 earthquakes have been recorded within 50 km since this one.
- 1.0 8 km S of Llano, CA
- 0.9 1 km SSW of Pasadena, CA
- 1.2 4 km N of Rancho Cucamonga, CA
- 1.0 2 km ESE of Littlerock, CA
- 2.1 4 km W of Devore, CA
- 0.9 4 km W of Devore, CA
- 0.9 6 km SE of Ontario, CA
- 0.8 3 km ENE of Fontana, CA
- 0.4 7 km SSW of Pearblossom, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| review status | automatic | reviewed | |
| longitude | -117.75 | -117.75 | |
| latitude | 34.31 | 34.31 | |
| depth | 6.38 | 6.25 |
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.