QuakeIndex

Earthquake · reviewed by a seismologist

M 4.0mw

12km NE of Trabuco Canyon, CA

· 11 km deep · released about 14 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 27 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 4.0 (mw)
Depth
11 km below the surface
Felt
11942 reports · strongest reported intensity IV
Measured shaking
intensity VI (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
Orange County, 27 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 847 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11942 people have reported feeling it to USGS.

How big was it?

This earthquake released about 14 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 12,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 560× the energy of this one
  3. Magna, Utah 2020 M 5.7 390× the energy of this one
  4. This earthquake M 4.0 about 14 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 29× 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 33.7410, -117.4912. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 27 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

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

  1. 1.6 12km NE of Trabuco Canyon, CA
  2. 1.6 8km N of Fontana, CA
  3. 2.5 2km NE of Redlands, CA
  4. 1.9 2km NE of Redlands, CA
  5. 1.6 2km NE of Redlands, CA
  6. 2.5 3km ENE of Upland, CA
  7. 2.3 5km SSE of Mentone, CA
  8. 2.6 1km SSW of Loma Linda, CA
  9. 1.6 1km E of Yorba Linda, CA
  10. 1.8 2km E of Menifee, CA
  11. 1.6 12km NE of Trabuco Canyon, CA
  12. 1.6 4km SE of Home Gardens, CA
  13. 2.1 3km SSE of Huntington Beach, CA
  14. 1.6 2km SE of Fontana, CA
  15. 1.6 7km S 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

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