QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

13km ESE of Anza, CA

· 9.4 km deep · released about 420 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 56 kmSan Diego County 58 kmOrange County 116 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 2.8 (ml)
Depth
9.4 km below the surface
Felt
14 reports · strongest reported intensity III
Nearest
Riverside County, 56 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3518 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 14 people have reported feeling it to USGS.

How big was it?

This earthquake released about 420 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 36,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 26,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.3× the energy of this one
  4. This earthquake M 2.8 about 420 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 33.5055, -116.5428. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 56 km (35 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 116 km (72 mi) E of here earthquakes near Orange County
Imperial County, CA 122 km (76 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

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

  1. 1.6 10km S of Idyllwild, CA
  2. 1.6 11km NNW of Anza, CA
  3. 2.5 10km NNW of Anza, CA
  4. 2.5 10km NNW of Anza, CA
  5. 2.7 12km ESE of Anza, CA
  6. 1.7 2km E of San Jacinto, CA
  7. 1.5 10km NW of Ocotillo Wells, CA
  8. 1.6 10km NE of Indio, CA
  9. 1.6 7km ESE of Valle Vista, CA
  10. 2.4 8km NNW of Julian, CA
  11. 2.6 4km WSW of Borrego Springs, CA
  12. 1.8 16km SSE of Hemet, CA
  13. 2.2 17km S of Hemet, CA
  14. 1.9 6km W of Borrego Springs, CA
  15. 1.7 8km SE of Valle Vista, 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 4,400 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.