QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

6km NNE of Anza, CA

· 15 km deep · released about 46 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 60 kmSan Diego County 66 kmOrange County 106 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 2.1 (ml)
Depth
15 km below the surface
Felt
no reports yet
Nearest
Riverside County, 60 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1710 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 46 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 330,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 21× the energy of this one
  4. This earthquake M 2.1 about 46 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 33.6043, -116.6375. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 60 km (38 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 66 km (41 mi) N of here earthquakes near San Diego County
Orange County, CA 106 km (66 mi) E of here earthquakes near Orange County
Imperial County, CA 135 km (84 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. 1.8 8km NE of Borrego Springs, CA
  2. 1.9 4km S of Idyllwild, CA
  3. 1.5 4km S of Idyllwild, CA
  4. 1.6 5km NE of Beaumont, CA
  5. 1.5 4km ENE of Beaumont, CA
  6. 2.0 16km ESE of Anza, CA
  7. 2.3 8km NE of Cabazon, CA
  8. 2.0 23km ESE of Anza, CA
  9. 2.1 5km SW of Palomar Observatory, CA
  10. 2.4 15km NNE of Borrego Springs, CA
  11. 1.6 4km NE of Banning, CA
  12. 2.3 9km ENE of Borrego Springs, CA
  13. 1.8 5km ENE of Beaumont, CA
  14. 1.8 2km WNW of Valle Vista, CA
  15. 1.7 11km ENE of Aguanga, 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 40,000 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.