QuakeIndex

Earthquake · reviewed by a seismologist

M 2.6ml

Earthquake near Trabuco Canyon, CA

No earthquake was likely felt in Trabuco Canyon in the 24 hours to 2:45 am PST (10:45 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 2.6 earthquake was recorded 13 km (8 mi) northeast of Trabuco Canyon, CA, at 12:39 pm PDT on 10 August 2018 (19:39 UTC), 11 km deep. 53 people have reported feeling it to USGS.

USGS: 13km NE of Trabuco Canyon, CA

15 km (9 mi) SSE of Corona, CA · 90 km (56 mi) ESE of Los Angeles, CA

12:39 pm PDT, Aug 10, 2018 · · 11 km deep · released about 280 lb of TNT

Every earthquake near Trabuco Canyon Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 28 kmLos Angeles County 87 kmSan Diego County 104 km
Distance rings around the epicentre, with the nearest towns at their true direction and later quakes as coloured dots. Not a shaking map — see the USGS ShakeMap for that.
When
12:39 pm PDT on 10 August 2018 ()
Where
13 km (8 mi) northeast of Trabuco Canyon, CA · earthquakes near Trabuco Canyon
Magnitude
M 2.6 (ml)
Depth
11 km below the surface
Felt
53 reports · strongest reported intensity IV
Measured shaking
intensity IV (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 2997 days ago

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 22 km (14 mi) from the epicentre. In Trabuco Canyon, 13 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.

Likely felt in: Rancho Santa Margarita 16 km, intensity II · Corona 16 km, intensity II · Lake Elsinore 17 km, intensity II · Norco 21 km, intensity II · Lake Forest 22 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 280 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 55,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 39,000× the energy of this one
  3. Around the size people start to feel M 3.0 3.5× the energy of this one
  4. This earthquake M 2.6 about 280 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

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:

  1. 6.7 The 1918 San Jacinto, California Earthquake · 48 km E of this epicentre
  2. 6.4 The 1933 Long Beach, California Earthquake · 49 km WSW of this epicentre
  3. 6.2 3 km SE of San Bernardino, California · 44 km NNE of this epicentre
  4. 6.0 The 1910 Lake Elsinore, California Earthquake · 10 km ESE of this epicentre
  5. 5.5 The 1990 Upland, California Earthquake · 48 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 33.7462, -117.4895. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection 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 (65 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

36 earthquakes have been recorded within 50 km since this one.

  1. 1.6 5km SE of Home Gardens, CA
  2. 1.5 7km SSE of Home Gardens, CA
  3. 1.6 12km SSE of Corona, CA
  4. 1.7 7km SSW of Redlands, CA
  5. 1.9 4km N of La Verne, CA
  6. 2.1 7km WSW of Calimesa, CA
  7. 2.1 9km ENE of North Tustin, CA
  8. 1.8 8km E of Yorba Linda, CA
  9. 2.1 7km W of Calimesa, CA
  10. 1.9 2km WNW of Orange, CA
  11. 1.7 3km W of Orange, CA
  12. 2.0 2km ESE of Loma Linda, CA
  13. 3.4 3km N of Colton, CA
  14. 1.9 5km SE of Home Gardens, CA
  15. 2.0 14km NW of Fallbrook, 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

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.