QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

6km NNW of San Jacinto, CA

· 12 km deep · released about 480 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 76 kmRiverside County 90 kmSan Diego County 92 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
12 km below the surface
Felt
60 reports · strongest reported intensity IV
Nearest
Orange County, 76 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3203 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 60 people have reported feeling it to USGS.

How big was it?

This earthquake released about 480 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 32,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 22,000× the energy of this one
  3. Around the size people start to feel M 3.0 2× the energy of this one
  4. This earthquake M 2.8 about 480 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 33.8350, -116.9732. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 76 km (47 mi) ENE of here earthquakes near Orange County
Riverside County, CA 90 km (56 mi) W of here earthquakes near Riverside County
San Diego County, CA 92 km (57 mi) NNW of here earthquakes near San Diego County
Los Angeles County, CA 125 km (78 mi) ESE of here earthquakes near Los Angeles County
San Bernardino County, CA 135 km (84 mi) SSW of here earthquakes near San Bernardino County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.8 5km S of Redlands, CA
  2. 2.0 5km SE of Cabazon, CA
  3. 1.6 9km S of Idyllwild, CA
  4. 1.9 9km NE of Aguanga, CA
  5. 1.6 9km SW of Idyllwild, CA
  6. 1.5 12km NNE of Cabazon, CA
  7. 2.2 8km NE of Aguanga, CA
  8. 2.1 9km NE of Aguanga, CA
  9. 1.6 9km NE of Aguanga, CA
  10. 1.8 8km ENE of Aguanga, CA
  11. 2.6 6km WNW of Desert Hot Springs, CA
  12. 1.7 8km ENE of Aguanga, CA
  13. 1.8 8km ENE of Aguanga, CA
  14. 2.0 4km SW of Redlands, CA
  15. 1.5 3km ENE of Rialto, 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 4.4 on 2016-01-06 — 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.