Earthquake · reviewed by a seismologist
M 2.9ml
Earthquake near Yucaipa, CA
No earthquake was likely felt in Yucaipa in the 24 hours to 6:12 am PST (14:12 UTC). The last one was M 1.5, 8 km (5 mi) ESE, at 3:54 pm PST on 9 November 2026, estimated intensity II (weak) in town. Every earthquake near Yucaipa
This page: a magnitude 2.9 earthquake was recorded in Yucaipa, CA, at 11:16 am PST on 18 December 2021 (19:16 UTC), 11 km deep. 37 people have reported feeling it to USGS.
USGS: 2km N of Yucaipa, CA
in Yucaipa, CA · 126 km (78 mi) E of Los Angeles, CA
- When
- 11:16 am PST on 18 December 2021 ()
- Where
- in Yucaipa, CA · earthquakes near Yucaipa
- Magnitude
- M 2.9 (ml)
- Depth
- 11 km below the surface
- Felt
- 37 reports · strongest reported intensity III
- Measured shaking
- intensity III (ShakeMap)
- Nearest
- Orange County, 79 km WSW
- Nearest mapped fault
- Crafton Hills 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 1641 days ago
Earthquake alerts for Yucaipa, CA
Get a notification in this browser when USGS records an earthquake near Yucaipa, 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 31 km (19 mi) from the epicentre. 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: Yucaipa in town, intensity III · Mentone 9 km, intensity III · Redlands 13 km, intensity III · Beaumont 15 km, intensity II · Highland 18 km, intensity II · Loma Linda 20 km, intensity II · Banning 21 km, intensity II · Moreno Valley 21 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
- Magna, Utah 2020 M 5.7 14,000× the energy of this one
- Around the size people start to feel M 3.0 1.3× the energy of this one
- This earthquake M 2.9 about 750 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 2018-05-08 — about 220 times the energy of this one.
Before 2016, the USGS record lists 19 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 32 km SSE of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 27 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 20 km WNW of this epicentre
- 6.0 The 1986 North Palm Springs, California Earthquake · 41 km E of this epicentre
- 5.6 7km ENE of Running Springs, CA · 21 km N 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 34.0473, -117.0453. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 79 km (49 mi) | WSW | earthquakes near Orange County |
| Riverside County, CA | 103 km (64 mi) | ESE | earthquakes near Riverside County |
| Los Angeles County, CA | 113 km (70 mi) | W | earthquakes near Los Angeles County |
| San Diego County, CA | 117 km (72 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 120 km (74 mi) | NE | earthquakes near San Bernardino County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.7 4km NNW of Fontana, CA
- 2.0 10km NNW of Idyllwild, CA
- 2.1 2km S of Devore, CA
- 1.9 2km S of Devore, CA
- 2.6 4km NNW of Fontana, CA
- 2.0 4km NW of Fontana, CA
- 2.4 5km SSW of Redlands, CA
- 2.0 4km SE of Home Gardens, CA
- 2.5 10km NW of San Jacinto, CA
- 1.9 13km NW of Big Bear Lake, CA
- 1.5 4km SSE of Rancho Cucamonga, CA
- 1.7 7km SSE of Home Gardens, CA
- 1.7 10km SSE of Cabazon, CA
- 2.0 4km WNW of Garnet, CA
- 1.6 1km W of Yucaipa, 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.