QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

13km NE of Trabuco Canyon, CA

· 11 km deep · released about 1,500 lb of TNT

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
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
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3082 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 606 people have reported feeling it to USGS.

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.

  1. Northridge, California 1994 M 6.7 220,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,800× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,900× the energy of this one
  4. This earthquake M 3.1 about 1,500 lb of TNT
  5. 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.

Where

Epicentre 33.7412, -117.4897. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 28 km (17 mi) ENE of here earthquakes near Orange County
Los Angeles County, CA 87 km (54 mi) SE of here earthquakes near Los Angeles County
San Diego County, CA 104 km (64 mi) NW of here 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. 1.7 2km NNE of Colton, CA
  2. 3.0 6km NE of Fontana, CA
  3. 1.8 4km NNE of Fontana, CA
  4. 1.8 6km SSE of Loma Linda, CA
  5. 1.7 8km SSE of Home Gardens, CA
  6. 1.6 12km NE of Trabuco Canyon, CA
  7. 1.6 8km N of Fontana, CA
  8. 2.5 2km NE of Redlands, CA
  9. 1.9 2km NE of Redlands, CA
  10. 1.6 2km NE of Redlands, CA
  11. 2.5 3km ENE of Upland, CA
  12. 2.3 5km SSE of Mentone, CA
  13. 2.6 1km SSW of Loma Linda, CA
  14. 1.6 1km E of Yorba Linda, CA
  15. 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

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