Earthquake · reviewed by a seismologist
M 1.9ml
Earthquake near Redlands, CA
No earthquake was likely felt in Redlands in the 24 hours to 5:30 am PST (13:30 UTC). The last one was M 2.0, 9 km (5 mi) SSE, at 10:33 pm PST on 2 November 2026, estimated intensity II (weak) in town. Every earthquake near Redlands
This page: a magnitude 1.9 earthquake was recorded 8 km (5 mi) south-southeast of Redlands, CA, at 9:26 am PST on 3 February 2021 (17:26 UTC), 14 km deep.
USGS: 8km SSE of Redlands, CA
7 km (4 mi) SSE of Redlands, CA · 116 km (72 mi) E of Los Angeles, CA
- When
- 9:26 am PST on 3 February 2021 ()
- Where
- 8 km (5 mi) south-southeast of Redlands, CA · earthquakes near Redlands
- Magnitude
- M 1.9 (ml)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 68 km WSW
- Nearest mapped fault
- Crafton Hills 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 2108 days ago
Earthquake alerts for Redlands, 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 4 km (2 mi) from the epicentre. In Redlands, 8 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: Calimesa, Mentone, Moreno Valley, Yucaipa, Loma Linda, March Air Force Base.
How big was it?
This earthquake released about 23 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 660,000× the energy of this one
- Magna, Utah 2020 M 5.7 470,000× the energy of this one
- Around the size people start to feel M 3.0 42× the energy of this one
- This earthquake M 1.9 about 23 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 7,200 times the energy of this one.
Before 2016, the USGS record lists 23 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 30 km SSE of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 38 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 15 km NW of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 40 km SW of this epicentre
- 5.6 7km ENE of Running Springs, CA · 29 km NNE 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 33.9923, -117.1510. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 68 km (42 mi) | WSW | earthquakes near Orange County |
| Los Angeles County, CA | 105 km (65 mi) | WNW | earthquakes near Los Angeles County |
| Riverside County, CA | 110 km (68 mi) | ESE | earthquakes near Riverside County |
| San Diego County, CA | 113 km (70 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 131 km (81 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
51 earthquakes have been recorded within 50 km since this one.
- 1.7 2km NNE of Colton, CA
- 1.7 5km SSE of Home Gardens, CA
- 1.5 4km NE of Beaumont, CA
- 1.6 9km SW of Idyllwild, CA
- 2.0 11km NNE of Running Springs, CA
- 1.6 14km E of Yucaipa, CA
- 2.5 3km SW of San Bernardino, CA
- 1.8 6km SW of Idyllwild, CA
- 1.6 6km E of Calimesa, CA
- 1.5 12km SE of Home Gardens, CA
- 2.4 12km N of Banning, CA
- 1.8 4km W of Beaumont, CA
- 1.9 6km N of Fontana, CA
- 1.6 1km NW of Loma Linda, CA
- 2.0 4km SW of San Bernardino, 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.