QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0ml

4km NNE of Brea, CA

· 16 km deep · released about 28 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 31 kmLos Angeles County 45 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 2.0 (ml)
Depth
16 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Orange County, 31 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1511 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 28 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 540,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 380,000× the energy of this one
  3. Around the size people start to feel M 3.0 34× the energy of this one
  4. This earthquake M 2.0 about 28 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 33.9437, -117.8808. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 31 km (19 mi) NNW of here earthquakes near Orange County
Los Angeles County, CA 45 km (28 mi) SE of here earthquakes near Los Angeles County
Ventura County, CA 124 km (77 mi) ESE of here earthquakes near Ventura County
San Diego County, CA 145 km (90 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

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

  1. 2.8 3km NW of Fontana, CA
  2. 2.6 13km NE of Trabuco Canyon, CA
  3. 2.4 3km NNE of Rancho Cucamonga, CA
  4. 1.6 1km SSE of Placentia, CA
  5. 2.6 3km SSW of Signal Hill, CA
  6. 1.9 2km WSW of Yorba Linda, CA
  7. 1.7 6km ESE of Ontario, CA
  8. 2.7 6km ESE of Ontario, CA
  9. 1.5 17km NNE of Glendora, CA
  10. 1.5 17km NNE of Glendora, CA
  11. 1.6 11km WSW of Corona, CA
  12. 1.7 6km NW of Glen Avon, CA
  13. 1.5 3km ESE of Home Gardens, CA
  14. 1.6 0km ENE of Universal City, CA
  15. 2.1 4km NW of Glen Avon, 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.