QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

7km WSW of Aguanga, CA

· 8.1 km deep · released about 3.2 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 47 kmOrange County 83 kmRiverside 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 (mw)
Depth
8.1 km below the surface
Felt
743 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
San Diego County, 47 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1564 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 743 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.2 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 53,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,400× 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 3.2 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 6.7× 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 33.4212, -116.9312. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 47 km (29 mi) NNW of here earthquakes near San Diego County
Orange County, CA 83 km (52 mi) ESE of here earthquakes near Orange County
Riverside County, CA 93 km (58 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

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

  1. 2.4 14km WNW of Anza, CA
  2. 2.4 7km SSW of Idyllwild, CA
  3. 2.3 6km SW of Idyllwild, CA
  4. 2.1 20km ESE of Anza, CA
  5. 2.0 20km ESE of Anza, CA
  6. 1.6 22km ESE of Anza, CA
  7. 1.5 6km ENE of Anza, CA
  8. 1.8 6km W of Palomar Observatory, CA
  9. 1.6 8km NE of Aguanga, CA
  10. 2.3 6km N of Lake Henshaw, CA
  11. 1.8 9km NE of Aguanga, CA
  12. 1.8 6km SW of Idyllwild, CA
  13. 2.2 16km NNW of Borrego Springs, CA
  14. 2.0 13km WNW of Anza, CA
  15. 2.1 20km ESE of Anza, 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 290 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.