Earthquake · reviewed by a seismologist
M 1.7ml
Earthquake near Wrightwood, CA
No earthquake was likely felt in Wrightwood in the 24 hours to 7:11 am PST (15:11 UTC). The last one was M 1.7, 5 km (3 mi) NW, at 6:36 pm PDT on 22 October 2026, estimated intensity II (weak) in town. Every earthquake near Wrightwood
This page: a magnitude 1.7 earthquake was recorded 2 km (1 mi) southeast of Wrightwood, CA, at 10:34 am PDT on 24 March 2023 (17:34 UTC), 11 km deep. 2 people have reported feeling it to USGS.
USGS: 2km SE of Wrightwood, CA
81 km (51 mi) ENE of Los Angeles, CA · 24 km (15 mi) NNW of Rancho Cucamonga, CA
- When
- 10:34 am PDT on 24 March 2023 ()
- Where
- 2 km (1 mi) southeast of Wrightwood, CA · earthquakes near Wrightwood
- Magnitude
- M 1.7 (ml)
- Depth
- 11 km below the surface
- Felt
- 2 reports · strongest reported intensity II
- Nearest
- Los Angeles County, 61 km WSW
- Nearest mapped fault
- San Andreas fault, under 1 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 1326 days ago
Earthquake alerts for Wrightwood, CA
Get a notification in this browser when USGS records an earthquake near Wrightwood, 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 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 6 km (4 mi) from the epicentre. In Wrightwood, 2 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: Wrightwood 2 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 9.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
- Around the size people start to feel M 3.0 99× the energy of this one
- This earthquake M 1.7 about 9.6 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 4.4 on 2018-08-29 — about 12,000 times the energy of this one.
Before 2016, the USGS record lists 5 earthquakes of M5 or more within 50 km:
- 6.2 3 km SE of San Bernardino, California · 44 km SE of this epicentre
- 5.8 The 1991 Sierra Madre, California Earthquake · 35 km WSW of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 24 km SSW of this epicentre
- 5.4 5km S of Chino Hills, CA · 46 km SSW of this epicentre
- 5.2 3km W of Lytle Creek, CA · 13 km SE 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 34.3458, -117.6198. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Los Angeles County, CA | 61 km (38 mi) | WSW | earthquakes near Los Angeles County |
| Orange County, CA | 76 km (47 mi) | S | earthquakes near Orange County |
| Kern County, CA | 150 km (93 mi) | NW | earthquakes near Kern County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
45 earthquakes have been recorded within 50 km since this one.
- 1.6 1km NW of Loma Linda, CA
- 1.5 8 km SE of Wrightwood, CA
- 1.5 6km NE of Fontana, CA
- 2.6 8km NNW of Rancho Cucamonga, CA
- 1.7 2km NNW of Colton, CA
- 2.7 6km NE of Fontana, CA
- 1.9 8km SSE of Wrightwood, CA
- 1.7 2km NNE of Colton, CA
- 1.6 6km NW of Rialto, CA
- 1.8 5km NE of Fontana, CA
- 1.9 7km SW of Pearblossom, CA
- 1.9 7km SW of Pearblossom, CA
- 1.6 7km SW of Pearblossom, CA
- 2.2 6km NE of Sierra Madre, CA
- 1.6 6km SE of Chino Hills, 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.