Earthquake · reviewed by a seismologist
M 3.5ml
Earthquake near Calimesa, CA
No earthquake was likely felt in Calimesa in the 24 hours to 3:04 am PST (11:04 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 3.5 earthquake was recorded 4 km (3 mi) east of Calimesa, CA, at 10:56 am PDT on 1 October 2018 (17:56 UTC), 16 km deep. 198 people have reported feeling it to USGS.
USGS: 4km ENE of Calimesa, CA
in Yucaipa, CA · 128 km (80 mi) E of Los Angeles, CA
- When
- 10:56 am PDT on 1 October 2018 ()
- Where
- 4 km (3 mi) east of Calimesa, CA · earthquakes near Calimesa
- Magnitude
- M 3.5 (ml)
- Depth
- 16 km below the surface
- Felt
- 198 reports · strongest reported intensity IV
- Measured shaking
- intensity IV (ShakeMap)
- Nearest
- Orange County, 79 km WSW
- Nearest mapped fault
- San Gorgonio Pass 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 2890 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 60 km (37 mi) from the epicentre. In Calimesa, 4 km away, the estimate is intensity III (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: Yucaipa 4 km, intensity III · Beaumont 9 km, intensity III · Mentone 13 km, intensity III · Banning 15 km, intensity III · Redlands 16 km, intensity III · Moreno Valley 21 km, intensity II · Highland 23 km, intensity II · Loma Linda 23 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 2.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 68,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 3,000× the energy of this one
- Magna, Utah 2020 M 5.7 2,100× the energy of this one
- This earthquake M 3.5 about 2.5 tons of TNT
- Around the size people start to feel M 3.0 this one released 5.2× more
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 33 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 · 27 km S of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 28 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 24 km WNW of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 49 km SW of this epicentre
- 6.0 The 1986 North Palm Springs, California Earthquake · 38 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 34.0013, -117.0173. 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 | 98 km (61 mi) | ESE | earthquakes near Riverside County |
| San Diego County, CA | 111 km (69 mi) | SSE | earthquakes near San Diego County |
| Los Angeles County, CA | 117 km (72 mi) | W | earthquakes near Los Angeles County |
| San Bernardino County, CA | 122 km (76 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.
- 1.6 6km WSW of Devore, CA
- 1.8 4km SE of Home Gardens, CA
- 2.5 3km SW of Morongo Valley, CA
- 2.0 2km ESE of Loma Linda, CA
- 2.0 8km SE of Valle Vista, CA
- 2.1 8km NNE of Beaumont, CA
- 1.6 8km NNE of Beaumont, CA
- 1.8 11km NNE of Running Springs, CA
- 1.5 8km NNE of Beaumont, CA
- 1.6 7km SE of Home Gardens, CA
- 2.1 8km NNE of Beaumont, CA
- 1.8 14km N of Cabazon, CA
- 1.7 14km SSE of Big Bear Lake, CA
- 1.8 9km NNW of Banning, CA
- 1.9 9km SE of Valle Vista, 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.