QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

12km NW of San Clemente Is. (NW tip), CA

· 5.8 km deep · released about 650 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 105 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
5.8 km below the surface
Felt
5 reports · strongest reported intensity IV
Nearest
Orange County, 105 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2754 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 5 people have reported feeling it to USGS.

How big was it?

This earthquake released about 650 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 23,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× 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 650 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 33.1122, -118.6823. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 105 km (65 mi) SW of here earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.3 8km W of San Clemente Is. (SE tip), CA
  2. 2.0 17km ESE of Santa Barbara Is., CA
  3. 2.8 24km ESE of Santa Barbara Is., CA
  4. 2.4 7km SSW of San Clemente Is. (SE tip), CA
  5. 2.0 4km SSE of San Clemente Is. (SE tip), CA
  6. 2.0 4km SSW of San Clemente Is. (SE tip), CA
  7. 2.7 35km S of Santa Barbara Is., CA
  8. 2.3 15km NW of San Clemente Is. (SE tip), CA
  9. 2.8 17km SSW of Santa Barbara Is., CA
  10. 2.7 14km SSW of San Clemente Is. (NW tip), CA
  11. 2.5 7km W of San Clemente Is. (SE tip), CA
  12. 3.1 10km WNW of San Clemente Is. (SE tip), CA
  13. 2.5 18km NW of San Clemente Is. (NW tip), CA
  14. 3.0 13km S of San Clemente Is. (NW tip), CA
  15. 2.3 30 km WSW of Avalon, California

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.