Earthquake · reviewed by a seismologist
M 2.2ml
Earthquake near Rubidoux, CA
No earthquake was likely felt in Rubidoux in the 24 hours to 6:52 am PST (14:52 UTC). The last one was M 2.1, 15 km (10 mi) ENE, at 10:40 am PDT on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Rubidoux
This page: a magnitude 2.2 earthquake was recorded 3 km (2 mi) west-southwest of Rubidoux, CA, at 12:48 am PDT on 6 June 2021 (07:48 UTC), 16 km deep. 1 person has reported feeling it to USGS.
USGS: 3km WSW of Rubidoux, CA
7 km (4 mi) NW of Riverside, CA · in Jurupa Valley, CA
- When
- 12:48 am PDT on 6 June 2021 ()
- Where
- 3 km (2 mi) west-southwest of Rubidoux, CA · earthquakes near Rubidoux
- Magnitude
- M 2.2 (ml)
- Depth
- 16 km below the surface
- Felt
- 1 report · strongest reported intensity III
- Nearest
- Orange County, 47 km SW
- Nearest mapped fault
- San Jacinto fault, 13 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 1666 days ago
Earthquake alerts for Rubidoux, 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 9 km (6 mi) from the epicentre. In Rubidoux, 3 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: Rubidoux 3 km, intensity II · Pedley 4 km, intensity II · Riverside 5 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 52 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 290,000× the energy of this one
- Magna, Utah 2020 M 5.7 200,000× the energy of this one
- Around the size people start to feel M 3.0 18× the energy of this one
- This earthquake M 2.2 about 52 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 2,100 times the energy of this one.
Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 49 km ESE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 20 km NE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 32 km S of this epicentre
- 5.6 7km ENE of Running Springs, CA · 46 km NE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 30 km NW 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 33.9862, -117.4333. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 47 km (29 mi) | SW | earthquakes near Orange County |
| Los Angeles County, CA | 80 km (50 mi) | WNW | earthquakes near Los Angeles County |
| San Diego County, CA | 123 km (77 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 150 km (93 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
56 earthquakes have been recorded within 50 km since this one.
- 3.0 4km SW of Redlands, CA
- 1.5 11km ENE of Yucaipa, CA
- 1.8 4km SE of Home Gardens, CA
- 2.0 14km ENE of Yucaipa, CA
- 2.1 0km W of Brea, CA
- 2.5 4km SE of Ontario, CA
- 1.7 6km NW of Corona, CA
- 2.0 9km WSW of Lytle Creek, CA
- 1.7 5km ENE of Villa Park, CA
- 1.6 12km E of Yucaipa, CA
- 1.8 11km NNE of Trabuco Canyon, CA
- 1.7 8km E of Yorba Linda, CA
- 1.9 6km E of Calimesa, CA
- 1.6 4km SE of Home Gardens, CA
- 1.6 5km NNE of Running Springs, 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.