Earthquake · reviewed by a seismologist
M 2.8ml
Earthquake near Calimesa, CA
No earthquake was likely felt in Calimesa in the 24 hours to 3:29 pm PST (23:29 UTC). The last one was M 2.0, 7 km (4 mi) WSW, at 10:33 pm PST on 2 November 2026, estimated intensity II (weak) in town. Every earthquake near Calimesa
This page: a magnitude 2.8 earthquake was recorded 5 km (3 mi) west of Calimesa, CA, at 10:35 am PST on 31 January 2024 (18:35 UTC), 18 km deep. 86 people have reported feeling it to USGS.
USGS: 6 km WNW of Calimesa, CA
7 km (4 mi) SE of Redlands, CA · 119 km (74 mi) E of Los Angeles, CA
- When
- 10:35 am PST on 31 January 2024 ()
- Where
- 5 km (3 mi) west of Calimesa, CA · earthquakes near Calimesa
- Magnitude
- M 2.8 (ml)
- Depth
- 18 km below the surface
- Felt
- 86 reports · strongest reported intensity IV
- Measured shaking
- intensity II (ShakeMap)
- Nearest
- Orange County, 71 km WSW
- Nearest mapped fault
- Crafton Hills fault, 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 943 days ago
Earthquake alerts for Calimesa, CA
Get a notification in this browser when USGS records an earthquake near Calimesa, 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 23 km (14 mi) from the epicentre. In Calimesa, 5 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: Mentone 7 km, intensity II · Yucaipa 8 km, intensity II · Redlands 8 km, intensity II · Moreno Valley 13 km, intensity II · Loma Linda 14 km, intensity II · Beaumont 16 km, intensity II · Highland 16 km, intensity II · Colton 19 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 550 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 28,000× the energy of this one
- Magna, Utah 2020 M 5.7 19,000× the energy of this one
- Around the size people start to feel M 3.0 1.7× the energy of this one
- This earthquake M 2.8 about 550 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 300 times the energy of this one.
Before 2016, the USGS record lists 24 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 · 35 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 16 km NW of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 43 km SW of this epicentre
- 6.0 The 1986 North Palm Springs, California Earthquake · 47 km E 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 34.0047, -117.1202. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 71 km (44 mi) | WSW | earthquakes near Orange County |
| Los Angeles County, CA | 107 km (67 mi) | WNW | earthquakes near Los Angeles County |
| Riverside County, CA | 108 km (67 mi) | ESE | earthquakes near Riverside County |
| San Diego County, CA | 114 km (71 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 128 km (80 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.
- 1.5 6 km SSW of Devore, CA
- 1.6 1 km S of Colton, CA
- 2.1 8 km N of Big Bear Lake, CA
- 1.9 10 km NNE of Yucaipa, CA
- 1.5 9 km W of Calimesa, CA
- 1.9 9 km W of Calimesa, CA
- 1.6 12 km W of Morongo Valley, CA
- 1.6 6 km E of Cabazon, CA
- 2.0 6 km SE of Valle Vista, CA
- 1.6 3 km SE of Yucaipa, CA
- 2.2 11 km NE of Cabazon, CA
- 1.6 6 km WSW of Idyllwild, CA
- 1.6 6 km N of Moreno Valley, CA
- 1.6 5 km SSE of Home Gardens, CA
- 2.4 2 km SSE of Loma Linda, 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.