Earthquake · reviewed by a seismologist
M 1.6ml
Earthquake near Winchester, CA
No earthquake was likely felt in Winchester in the 24 hours to 5:47 am PST (13:47 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 1.6 earthquake was recorded 3 km (2 mi) southeast of Winchester, CA, at 2:22 am PDT on 30 October 2018 (09:22 UTC), 14 km deep.
USGS: 3km SE of Winchester, CA
8 km (5 mi) SW of Hemet, CA · 130 km (81 mi) ESE of Los Angeles, CA
- When
- 2:22 am PDT on 30 October 2018 ()
- Where
- 3 km (2 mi) southeast of Winchester, CA · earthquakes near Winchester
- Magnitude
- M 1.6 (ml)
- Depth
- 14 km below the surface
- Felt
- no reports yet
- Nearest
- Orange County, 66 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 2935 days ago
Earthquake alerts for Winchester, CA
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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. In Winchester, 3 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: Green Acres, Homeland, Menifee, Hemet, East Hemet, San Jacinto.
How big was it?
This earthquake released about 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.
- Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
- Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
- Around the size people start to feel M 3.0 110× the energy of this one
- This earthquake M 1.6 about 8.7 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 19,000 times the energy of this one.
Before 2016, the USGS record lists 12 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 12 km NE of this epicentre
- 6.2 3 km SE of San Bernardino, California · 48 km NNW of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 31 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 33.6842, -117.0640. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 66 km (41 mi) | W | earthquakes near Orange County |
| San Diego County, CA | 78 km (49 mi) | SSE | earthquakes near San Diego County |
| Riverside County, CA | 98 km (61 mi) | E | earthquakes near Riverside County |
| Los Angeles County, CA | 124 km (77 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
57 earthquakes have been recorded within 50 km since this one.
- 1.9 10km WSW of Idyllwild, CA
- 2.1 8km S of Cabazon, CA
- 1.9 8km NE of Aguanga, CA
- 1.7 10km WNW of Palomar Observatory, CA
- 1.7 5km SSE of Banning, CA
- 1.9 2km SSE of Loma Linda, CA
- 2.4 7km ENE of Aguanga, CA
- 1.7 7km NE of Aguanga, CA
- 1.7 8km NE of Aguanga, CA
- 1.5 10km NE of Aguanga, CA
- 1.9 3km SE of Loma Linda, CA
- 2.1 11km NE of Trabuco Canyon, CA
- 1.6 2km NE of Banning, CA
- 1.8 9km NNW of Anza, CA
- 1.8 4km SE of Home Gardens, 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.