QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

10km WNW of Palomar Observatory, CA

· 6.2 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 44 kmOrange County 82 kmRiverside County 97 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 1.5 (ml)
Depth
6.2 km below the surface
Felt
no reports yet
Nearest
San Diego County, 44 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3776 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 33.3838, -116.9675. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 44 km (27 mi) NNW of here earthquakes near San Diego County
Orange County, CA 82 km (51 mi) ESE of here earthquakes near Orange County
Riverside County, CA 97 km (61 mi) WSW of here earthquakes near Riverside 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. 2.0 12km ESE of Anza, CA
  2. 2.0 20km ESE of Anza, CA
  3. 1.9 22km ESE of Anza, CA
  4. 1.9 20km ESE of Anza, CA
  5. 1.8 11km ESE of Anza, CA
  6. 1.8 22km ESE of Anza, CA
  7. 1.6 23km ESE of Anza, CA
  8. 2.6 21km NNW of Borrego Springs, CA
  9. 1.6 22km ESE of Anza, CA
  10. 3.1 22km ESE of Anza, CA
  11. 2.0 23km NNW of Borrego Springs, CA
  12. 1.9 20km ESE of Anza, CA
  13. 2.3 23km ESE of Anza, CA
  14. 1.9 22km ESE of Anza, CA
  15. 3.2 21km NNW of Borrego Springs, 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.