Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Moreno Valley, CA
No earthquake was likely felt in Moreno Valley in the 24 hours to 4:29 am PST (12:29 UTC). The last one was M 2.1, 11 km (7 mi) N, at 10:40 am PDT on 31 October 2026, estimated intensity II (weak) in town. Every earthquake near Moreno Valley
This page: a magnitude 1.8 earthquake was recorded 8 km (5 mi) east-northeast of Moreno Valley, CA, at 3:22 pm PDT on 2 October 2021 (22:22 UTC), 13 km deep.
USGS: 8km ENE of Moreno Valley, CA
6 km (4 mi) NE of Moreno Valley, CA · 116 km (72 mi) E of Los Angeles, CA
- When
- 3:22 pm PDT on 2 October 2021 ()
- Where
- 8 km (5 mi) east-northeast of Moreno Valley, CA · earthquakes near Moreno Valley
- Magnitude
- M 1.8 (ml)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 66 km WSW
- Nearest mapped fault
- San Jacinto 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 1866 days ago
Earthquake alerts for Moreno Valley, 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 5 km (3 mi) from the epicentre. In Moreno Valley, 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, Redlands, Mentone, March Air Force Base, Yucaipa, Loma Linda.
How big was it?
This earthquake released about 17 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 870,000× the energy of this one
- Magna, Utah 2020 M 5.7 620,000× the energy of this one
- Around the size people start to feel M 3.0 55× the energy of this one
- This earthquake M 1.8 about 17 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 9,400 times the energy of this one.
Before 2016, the USGS record lists 22 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 28 km SE of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 40 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 17 km NW of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 37 km SW of this epicentre
- 5.6 7km ENE of Running Springs, CA · 32 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 33.9642, -117.1553. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 66 km (41 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 | 110 km (69 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 134 km (83 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
54 earthquakes have been recorded within 50 km since this one.
- 1.9 3km N of Loma Linda, CA
- 1.8 11km WSW of Morongo Valley, CA
- 1.6 4km W of Yucaipa, CA
- 1.6 5km SSE of Loma Linda, CA
- 2.0 4km W of Yucaipa, CA
- 1.8 3km E of Calimesa, CA
- 2.6 9km ESE of Big Bear City, CA
- 1.6 6km E of Calimesa, CA
- 1.9 10km NW of Garnet, CA
- 1.9 4km SSE of Home Gardens, CA
- 1.7 8km NE of Moreno Valley, CA
- 3.2 8km N of Cabazon, CA
- 1.7 7km NE of Cabazon, CA
- 1.5 8km SSE of Banning, CA
- 1.7 4km NNE of Moreno Valley, 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.