QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

3km WNW of Yorba Linda, CA

· 3.4 km deep · released about 630 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 25 kmLos Angeles County 51 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 2.9 (ml)
Depth
3.4 km below the surface
Felt
566 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
Nearest
Orange County, 25 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2734 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 566 people have reported feeling it to USGS.

How big was it?

This earthquake released about 630 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 24,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 17,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 630 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 33.8975, -117.8412. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 25 km (16 mi) NNW of here earthquakes near Orange County
Los Angeles County, CA 51 km (32 mi) SE of here earthquakes near Los Angeles County
Ventura County, CA 130 km (80 mi) ESE of here earthquakes near Ventura County
San Diego County, CA 139 km (86 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

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

  1. 1.5 5km SE of Home Gardens, CA
  2. 1.5 7km SSE of Home Gardens, CA
  3. 2.0 2km ESE of Rowland Heights, CA
  4. 2.1 4km W of Costa Mesa, CA
  5. 1.5 1km SW of La Canada Flintridge, CA
  6. 1.5 3km SE of Brea, CA
  7. 1.6 2km SW of View Park-Windsor Hills, CA
  8. 1.6 4km SE of Home Gardens, CA
  9. 1.6 7km SSE of Home Gardens, CA
  10. 1.6 5km SE of Home Gardens, CA
  11. 1.6 2km N of Bradbury, CA
  12. 1.9 1km ENE of Brea, CA
  13. 1.6 1km SW of View Park-Windsor Hills, CA
  14. 1.5 2km WNW of Huntington Park, CA
  15. 1.9 3km NNW of Baldwin Park, 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.