QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5ml

24km E of Julian, CA

· 11 km deep · released about 3.1 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 39 kmRiverside County 83 kmImperial County 93 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 3.5 (ml)
Depth
11 km below the surface
Felt
273 reports · strongest reported intensity V
Measured shaking
intensity IV (ShakeMap)
Nearest
San Diego County, 39 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1528 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 273 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.1 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 55,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,500× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,700× the energy of this one
  4. This earthquake M 3.5 about 3.1 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.5× 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 33.0392, -116.3538. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 39 km (24 mi) E of here earthquakes near San Diego County
Riverside County, CA 83 km (52 mi) SSW of here earthquakes near Riverside County
Imperial County, CA 93 km (58 mi) W of here earthquakes near Imperial County

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

Aftershocks so far

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

  1. 1.9 21km ESE of Julian, CA
  2. 1.6 2km ESE of Lake Henshaw, CA
  3. 2.5 22km NW of Ocotillo, CA
  4. 1.8 10km NNE of Ocotillo Wells, CA
  5. 1.9 16km NNW of Borrego Springs, CA
  6. 2.7 16km NNW of Borrego Springs, CA
  7. 1.9 13km SSW of Borrego Springs, CA
  8. 1.8 13km SSW of Borrego Springs, CA
  9. 1.7 27km ENE of Pine Valley, CA
  10. 1.6 6km SSW of Warner Springs, CA
  11. 1.5 23km ESE of Anza, CA
  12. 1.5 20km SW of Ocotillo Wells, CA
  13. 2.3 10km NNE of Ocotillo Wells, CA
  14. 1.9 10km NNE of Ocotillo Wells, CA
  15. 1.9 8km SSW of Salton City, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 5.2 on 2016-06-10 — it released about 300 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.