QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9ml

21km ESE of Anza, CA

· 11 km deep · released about 650 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 51 kmSan Diego County 58 kmImperial County 114 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 2.9 (ml)
Depth
11 km below the surface
Felt
25 reports · strongest reported intensity IV
Nearest
Riverside County, 51 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 713 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 25 people have reported feeling it to USGS.

How big was it?

This earthquake released about 650 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 23,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 16,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.5× the energy of this one
  4. This earthquake M 2.9 about 650 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 33.4758, -116.4647. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 51 km (32 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 58 km (36 mi) NNE of here earthquakes near San Diego County
Imperial County, CA 114 km (71 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

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

  1. 1.6 12km NNE of Borrego Springs, CA
  2. 2.0 16km NE of Borrego Springs, CA
  3. 2.6 15km NE of Borrego Springs, CA
  4. 1.9 14 km WNW of Anza, CA
  5. 2.1 2 km SE of Lake Henshaw, CA
  6. 1.7 11km N of Borrego Springs, CA
  7. 1.7 8km NE of Aguanga, CA
  8. 1.5 3 km SE of Lake Henshaw, CA
  9. 1.7 13km WNW of Anza, CA
  10. 1.9 6km SW of Idyllwild, CA
  11. 1.9 3km W of Aguanga, CA
  12. 1.5 16 km ENE of Borrego Springs, CA
  13. 1.6 8km NNW of Borrego Springs, CA
  14. 2.0 6km NE of Aguanga, CA
  15. 1.9 18km 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 2,800 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.