QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

15km ESE of Anza, CA

· 10 km deep · released about 1,600 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 54 kmSan Diego County 58 kmOrange County 118 kmImperial County 120 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 3.1 (ml)
Depth
10 km below the surface
Felt
43 reports · strongest reported intensity IV
Nearest
Riverside County, 54 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1832 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 43 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,600 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.2 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 210,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 9,400× the energy of this one
  3. Magna, Utah 2020 M 5.7 6,700× the energy of this one
  4. This earthquake M 3.1 about 1,600 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.7× 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 33.4990, -116.5212. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 54 km (34 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 58 km (36 mi) NNE of here earthquakes near San Diego County
Orange County, CA 118 km (73 mi) E of here earthquakes near Orange County
Imperial County, CA 120 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

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

  1. 3.0 22km NNW of Borrego Springs, CA
  2. 1.6 22km N of Borrego Springs, CA
  3. 2.8 14km NNE of Borrego Springs, CA
  4. 1.6 5km SW of Idyllwild, CA
  5. 1.6 11km SSW of Idyllwild, CA
  6. 2.4 21km ESE of Anza, CA
  7. 1.6 3km ESE of Lake Henshaw, CA
  8. 2.1 8km NE of Aguanga, CA
  9. 1.8 7km ENE of Aguanga, CA
  10. 2.8 7km SSW of Cabazon, CA
  11. 1.8 16km NNE of Borrego Springs, CA
  12. 1.9 3km SE of Lake Henshaw, CA
  13. 2.4 2km SE of Lake Henshaw, CA
  14. 2.5 5km NNE of Lake Henshaw, CA
  15. 1.8 3km ESE of Lake Henshaw, 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 1,100 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.