QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

1 km SW of Julian, CA

· 16 km deep · released about 430 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 16 kmRiverside County 92 kmImperial County 117 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 2.8 (ml)
Depth
16 km below the surface
Felt
163 reports · strongest reported intensity III
Nearest
San Diego County, 16 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 131 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 163 people have reported feeling it to USGS.

How big was it?

This earthquake released about 430 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 35,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 25,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.2× the energy of this one
  4. This earthquake M 2.8 about 430 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 33.0737, -116.6095. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 16 km (10 mi) ENE of here earthquakes near San Diego County
Riverside County, CA 92 km (57 mi) SW of here earthquakes near Riverside County
Imperial County, CA 117 km (73 mi) W of here earthquakes near Imperial County
Orange County, CA 127 km (79 mi) ESE of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 2.2 3 km SSW of Julian, CA
  2. 1.6 3 km WSW of Julian, CA
  3. 2.1 2 km SSW of Julian, CA
  4. 1.7 8 km NE of Borrego Springs, CA
  5. 2.2 3 km S of Julian, CA
  6. 2.5 2 km SW of Julian, CA
  7. 1.5 2 km WSW of Julian, CA
  8. 1.9 8 km NNE of Julian, CA
  9. 2.6 3 km SSW of Julian, CA
  10. 2.3 6 km SSE of Julian, CA
  11. 1.6 4 km S of Julian, CA
  12. 1.7 4 km SSE of Julian, CA
  13. 2.5 14 km SE of Anza, CA
  14. 1.6 2 km SW of Julian, CA
  15. 1.5 3 km SSW of Julian, 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 2025-04-14 — it released about 4,600 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.