Earthquake · reviewed by a seismologist
M 3.1ml
Earthquake near Trabuco Canyon, CA
No earthquake was likely felt in Trabuco Canyon in the 24 hours to 11:50 pm PST (07:50 UTC). The last one was M 3.5, 54 km (34 mi) SW, at 1:22 pm PDT on 5 October 2026, estimated intensity II (weak) in town; 126 felt reports to USGS. Every earthquake near Trabuco Canyon
This page: a magnitude 3.1 earthquake was recorded 13 km (8 mi) northeast of Trabuco Canyon, CA, at 4:47 am PST on 27 January 2018 (12:47 UTC), 11 km deep. 606 people have reported feeling it to USGS.
USGS: 13km NE of Trabuco Canyon, CA
90 km (56 mi) ESE of Los Angeles, CA · 15 km (9 mi) SSE of Corona, CA
- When
- 4:47 am PST on 27 January 2018 ()
- Where
- 13 km (8 mi) northeast of Trabuco Canyon, CA · earthquakes near Trabuco Canyon
- Magnitude
- M 3.1 (ml)
- Depth
- 11 km below the surface
- Felt
- 606 reports · strongest reported intensity III
- Measured shaking
- intensity V (ShakeMap)
- Nearest
- Orange County, 28 km WSW
- Nearest mapped fault
- Elsinore 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 3128 days ago
Earthquake alerts for Trabuco Canyon, 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 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 42 km (26 mi) from the epicentre. In Trabuco Canyon, 13 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: Rancho Santa Margarita 15 km, intensity III · Corona 17 km, intensity III · Lake Elsinore 17 km, intensity III · Lake Forest 21 km, intensity II · Norco 22 km, intensity II · Mission Viejo 23 km, intensity II · Perris 25 km, intensity II · Wildomar 25 km, intensity II. Estimated for each town centre; each link is that town's own record.
How big was it?
This earthquake released about 1,500 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.
- Northridge, California 1994 M 6.7 220,000× the energy of this one
- Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
- Magna, Utah 2020 M 5.7 6,900× the energy of this one
- This earthquake M 3.1 about 1,500 lb of TNT
- Around the size people start to feel M 3.0 this one released 1.6× 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
No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.
Before 2016, the USGS record lists 13 earthquakes of M5 or more within 50 km; the five largest:
- 6.7 The 1918 San Jacinto, California Earthquake · 48 km E of this epicentre
- 6.4 The 1933 Long Beach, California Earthquake · 49 km WSW of this epicentre
- 6.2 3 km SE of San Bernardino, California · 44 km NNE of this epicentre
- 6.0 The 1910 Lake Elsinore, California Earthquake · 9 km ESE of this epicentre
- 5.5 The 1990 Upland, California Earthquake · 49 km NNW 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 33.7412, -117.4897. Map © OpenStreetMap contributors.
Nearby places
| Place | Distance | Direction from the epicentre | |
|---|---|---|---|
| Orange County, CA | 28 km (17 mi) | WSW | earthquakes near Orange County |
| Los Angeles County, CA | 87 km (54 mi) | NW | earthquakes near Los Angeles County |
| San Diego County, CA | 104 km (64 mi) | SE | earthquakes near San Diego County |
Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.
Aftershocks so far
52 earthquakes have been recorded within 50 km since this one.
- 1.7 2km NNE of Colton, CA
- 3.0 6km NE of Fontana, CA
- 1.8 4km NNE of Fontana, CA
- 1.8 6km SSE of Loma Linda, CA
- 1.7 8km SSE of Home Gardens, CA
- 1.6 12km NE of Trabuco Canyon, CA
- 1.6 8km N of Fontana, CA
- 2.5 2km NE of Redlands, CA
- 1.9 2km NE of Redlands, CA
- 1.6 2km NE of Redlands, CA
- 2.5 3km ENE of Upland, CA
- 2.3 5km SSE of Mentone, CA
- 2.6 1km SSW of Loma Linda, CA
- 1.6 1km E of Yorba Linda, CA
- 1.8 2km E of Menifee, 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.