Earthquake · reviewed by a seismologist
M 1.8ml
Earthquake near Winchester, CA
No earthquake was likely felt in Winchester in the 24 hours to 11:55 am PST (19:55 UTC). The last one was M 2.8, 16 km (10 mi) NE, at 8:30 pm PDT on 14 October 2026, estimated intensity II (weak) in town; 87 felt reports to USGS. Every earthquake near Winchester
This page: a magnitude 1.8 earthquake was recorded in Winchester, CA, at 5:10 am PDT on 20 October 2025 (12:10 UTC), 12 km deep.
USGS: 1 km E of Winchester, CA
8 km (5 mi) WSW of Hemet, CA · 128 km (80 mi) ESE of Los Angeles, CA
- When
- 5:10 am PDT on 20 October 2025 ()
- Where
- in Winchester, CA · earthquakes near Winchester
- Magnitude
- M 1.8 (ml)
- Depth
- 12 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 65 km W
- Nearest mapped fault
- San Jacinto fault, 15 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 387 days ago
Earthquake alerts for Winchester, 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 6 km (4 mi) from the epicentre. 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: Green Acres, Homeland, Menifee, Hemet, Nuevo, East Hemet.
How big was it?
This earthquake released about 15 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 1,000,000× the energy of this one
- Magna, Utah 2020 M 5.7 730,000× the energy of this one
- Around the size people start to feel M 3.0 65× the energy of this one
- This earthquake M 1.8 about 15 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 11,000 times the energy of this one.
Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 11 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 46 km NNW of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 30 km W of this epicentre
- 5.3 6km SSE of Hemet, CA · 12 km E of this epicentre
- 5.2 8km ENE of Trabuco Canyon, CA · 41 km W 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 33.7055, -117.0727. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 65 km (41 mi) | W | earthquakes near Orange County |
| San Diego County, CA | 81 km (50 mi) | SSE | earthquakes near San Diego County |
| Riverside County, CA | 99 km (62 mi) | E | earthquakes near Riverside County |
| Los Angeles County, CA | 123 km (76 mi) | WNW | earthquakes near Los Angeles 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 3 km NW of Palomar Observatory, CA
- 1.9 7 km WNW of Anza, CA
- 1.5 2 km NNW of Loma Linda, CA
- 1.7 4 km SE of Home Gardens, CA
- 1.8 11 km SSW of Calimesa, CA
- 2.2 3 km WNW of Cabazon, CA
- 2.6 10 km SW of Idyllwild, CA
- 2.2 10 km SW of Idyllwild, CA
- 1.9 5 km SSE of Banning, CA
- 2.0 10 km SW of Idyllwild, CA
- 3.5 10 km SW of Idyllwild, CA
- 3.5 10 km SW of Idyllwild, CA
- 1.5 11 km ENE of Aguanga, CA
- 1.5 4 km SW of Redlands, CA
- 2.0 4 km NW of Redlands, 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.