QuakeIndex

Earthquake · reviewed by a seismologist

M 3.6mw

16km ESE of Anza, CA

· 9.6 km deep · released about 3.8 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 55 kmSan Diego County 57 kmOrange County 118 kmImperial County 119 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 3.6 (mw)
Depth
9.6 km below the surface
Felt
335 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Riverside County, 55 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2290 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 335 people have reported feeling it to USGS.

How big was it?

This earthquake released about 3.8 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.6 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 45,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 1,400× the energy of this one
  4. This earthquake M 3.6 about 3.8 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 7.9× 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 33.4913, -116.5188. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 55 km (34 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 57 km (36 mi) NNE of here earthquakes near San Diego County
Orange County, CA 118 km (74 mi) E of here earthquakes near Orange County
Imperial County, CA 119 km (74 mi) WNW of here earthquakes near Imperial 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. 2.1 15km ESE of Anza, CA
  2. 1.7 16 km ESE of Anza, CA
  3. 2.6 15km ESE of Anza, CA
  4. 2.4 16km ESE of Anza, CA
  5. 1.6 15km ESE of Anza, CA
  6. 2.4 16km ESE of Anza, CA
  7. 1.7 15km ESE of Anza, CA
  8. 1.5 15km ESE of Anza, CA
  9. 1.6 15km ESE of Anza, CA
  10. 1.8 16km ESE of Anza, CA
  11. 1.8 16km ESE of Anza, CA
  12. 1.6 18km ESE of Anza, CA
  13. 1.9 14km ESE of Anza, CA
  14. 2.0 15km ESE of Anza, CA
  15. 1.9 15km 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 240 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.