QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

3km SE of Brea, CA

· 8.5 km deep · released about 5.4 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 27 kmLos Angeles County 48 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 1.5 (ml)
Depth
8.5 km below the surface
Felt
no reports yet
Nearest
Orange County, 27 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3518 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 5.4 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,800,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 2,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 180× the energy of this one
  4. This earthquake M 1.5 about 5.4 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.

Where

Epicentre 33.9022, -117.8773. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 27 km (17 mi) NNW of here earthquakes near Orange County
Los Angeles County, CA 48 km (30 mi) SE of here earthquakes near Los Angeles County
Ventura County, CA 126 km (78 mi) ESE of here earthquakes near Ventura County
San Diego County, CA 141 km (88 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

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

  1. 1.6 4km SE of Home Gardens, CA
  2. 1.8 8km N of Rancho Cucamonga, CA
  3. 1.9 2km NW of Willowbrook, CA
  4. 1.9 1km SE of Fontana, CA
  5. 1.6 3km WSW of Compton, CA
  6. 1.6 1km ESE of Hawthorne, CA
  7. 1.9 1km SSE of View Park-Windsor Hills, CA
  8. 1.5 14km N of La Verne, CA
  9. 2.7 1km E of Brea, CA
  10. 1.9 1km ENE of Brea, CA
  11. 1.5 7km WSW of Huntington Beach, CA
  12. 1.5 11km SW of Huntington Beach, CA
  13. 1.8 4km SE of Home Gardens, CA
  14. 2.2 5km ESE of Rancho Cucamonga, CA
  15. 1.8 4km ESE of Marina del Rey, 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.