QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

41km WSW of Carlsbad, CA

· 5.8 km deep · released about 38 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 75 kmSan Diego County 91 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 2.1 (ml)
Depth
5.8 km below the surface
Felt
2 reports · strongest reported intensity II
Nearest
Orange County, 75 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2526 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 38 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 390,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 280,000× the energy of this one
  3. Around the size people start to feel M 3.0 25× the energy of this one
  4. This earthquake M 2.1 about 38 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 33.0038, -117.7472. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 75 km (46 mi) S of here earthquakes near Orange County
San Diego County, CA 91 km (56 mi) W 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

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

  1. 2.5 22km W of La Jolla, CA
  2. 1.5 38km W of La Jolla, CA
  3. 1.9 23km WSW of Dana Point, CA
  4. 1.7 30km WSW of La Jolla, CA
  5. 1.7 16km S of San Clemente, CA
  6. 1.7 18km WSW of La Jolla, CA
  7. 2.6 52km ESE of San Clemente Is. (SE tip), CA
  8. 2.7 33km WSW of La Jolla, CA
  9. 1.8 39km WSW of Carlsbad, CA
  10. 1.6 29km WSW of Camp Pendleton South, CA
  11. 2.0 30km SW of Dana Point, CA
  12. 1.7 30km SW of Dana Point, CA
  13. 2.1 39km WSW of Encinitas, CA
  14. 1.9 13km W of Carlsbad, CA
  15. 2.7 43km WSW of Encinitas, 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.