Earthquake · automatic estimate, may change
M 1.0ml
Earthquake near Calimesa, CA
No earthquake was likely felt in Calimesa in the 24 hours to 1:29 am PST (09:29 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 1.0 earthquake was recorded 5 km (3 mi) west-northwest of Calimesa, CA, at 5:20 am PDT on 26 September 2026 (12:20 UTC), 13 km deep. The magnitude and location are an automatic first estimate and may change.
USGS: 6 km WNW of Calimesa, CA
7 km (4 mi) WSW of Yucaipa, CA · 120 km (74 mi) E of Los Angeles, CA
- When
- 5:20 am PDT on 26 September 2026 ()
- Where
- 5 km (3 mi) west-northwest of Calimesa, CA · earthquakes near Calimesa
- Magnitude
- M 1.0 (ml)
- Depth
- 13 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 72 km WSW
- Nearest mapped fault
- Crafton Hills fault, under 1 km from its surface trace — near is not the same as on
- Status
- Automatic — a machine’s first estimate, which may change
USGS · last changed by USGS · we first saw it 47 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 minor earthquake. Quakes this small are rarely felt and do not cause damage.
At this magnitude and depth it was probably too small to be felt, even directly above it. 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: Mentone, Yucaipa, Redlands, Cherry Valley, Moreno Valley, Loma Linda.
How big was it?
This earthquake released about 1.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.0 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 14,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 10,000,000× the energy of this one
- Around the size people start to feel M 3.0 900× the energy of this one
- This earthquake M 1.0 about 1.1 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 150,000 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 · 31 km SSE of this epicentre
- 6.3 The 1992 Big Bear, California Earthquake · 34 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 16 km WNW of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 44 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 34.0140, -117.1133. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 72 km (45 mi) | WSW | earthquakes near Orange County |
| Riverside County, CA | 107 km (67 mi) | ESE | earthquakes near Riverside County |
| Los Angeles County, CA | 108 km (67 mi) | W | earthquakes near Los Angeles County |
| San Diego County, CA | 114 km (71 mi) | SSE | earthquakes near San Diego County |
| San Bernardino County, CA | 127 km (79 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
38 earthquakes have been recorded within 50 km since this one.
- 1.2 2 km ESE of Home Gardens, CA
- 0.9 6 km SE of Ontario, CA
- 1.0 9 km NNW of Big Bear City, CA
- 1.6 3 km SE of Loma Linda, CA
- 0.2 9 km SW of Idyllwild, CA
- 0.8 4 km W of Garnet, CA
- 0.6 7 km ESE of Valle Vista, CA
- 0.8 3 km ENE of Fontana, CA
- 0.6 6 km SW of Idyllwild, CA
- 0.6 7 km ESE of Valle Vista, CA
- 0.7 5 km SW of Idyllwild, CA
- 1.1 7 km ENE of Yucaipa, CA
- 0.8 8 km SE of Valle Vista, CA
- 0.7 7 km SW of Beaumont, CA
- 0.8 2 km E of San Jacinto, 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.
Revisions
USGS refines a solution as more stations report. Every change we have seen is listed here.
| What changed | From | To | When |
|---|---|---|---|
| longitude | -117.11 | -117.11 | |
| latitude | 34.01 | 34.01 | |
| depth | 12.91 | 13.45 | |
| magnitude | 1.18 | 1.03 |
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.