QuakeIndex

Earthquake · reviewed by a seismologist

M 3.4ml

6km S of San Clemente Is. (SE tip), CA

· 1.8 km deep · released about 1.9 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 114 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 3.4 (ml)
Depth
1.8 km below the surface
Felt
17 reports · strongest reported intensity III
Measured shaking
intensity IV (ShakeMap)
Nearest
Orange County, 114 km NNE
Nearest mapped fault
San Clemente fault, 6 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2720 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 17 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.9 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.4 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 89,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,800× the energy of this one
  4. This earthquake M 3.4 about 1.9 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 4× 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 32.7708, -118.3463. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 114 km (71 mi) SSW of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 3.6 45 km ENE of San Clemente Is. (SE tip), CA
  2. 1.5 37 km NE of San Clemente Is. (SE tip), CA
  3. 2.3 4km SE of San Clemente Is. (SE tip), CA
  4. 2.3 8km W of San Clemente Is. (SE tip), CA
  5. 2.6 43km SE of San Clemente Is. (SE tip), CA
  6. 2.9 38km SSE of San Clemente Is. (SE tip), CA
  7. 2.5 44km SE of Avalon, CA
  8. 2.6 12km SSE of San Clemente Is. (SE tip), CA
  9. 2.4 7km SSW of San Clemente Is. (SE tip), CA
  10. 2.0 4km SSE of San Clemente Is. (SE tip), CA
  11. 2.0 4km SSW of San Clemente Is. (SE tip), CA
  12. 3.6 37km SSE of San Clemente Is. (SE tip), CA
  13. 3.2 18km SE of San Clemente Is. (SE tip), CA
  14. 1.8 31km SE of San Clemente Is. (SE tip), CA
  15. 2.1 6km ESE of San Clemente Is. (SE tip), 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.