QuakeIndex

Earthquake · reviewed by a seismologist

M 3.0ml

4km SW of Redlands, CA

· 15 km deep · released about 1,100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 66 kmLos Angeles County 98 kmRiverside County 117 kmSan Diego 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 3.0 (ml)
Depth
15 km below the surface
Felt
153 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Orange County, 66 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1810 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 153 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.0 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 300,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 13,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 9,400× the energy of this one
  4. This earthquake M 3.0 about 1,100 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 34.0357, -117.2120. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 66 km (41 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 98 km (61 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 117 km (73 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 120 km (74 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 131 km (82 mi) SW 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. 1.8 5km NE of Wildomar, CA
  2. 2.2 4km NE of Beaumont, CA
  3. 1.5 4km ENE of Big Bear City, CA
  4. 1.5 7km ENE of Cabazon, CA
  5. 1.6 4km S of Lucerne Valley, CA
  6. 2.1 5km SSE of Home Gardens, CA
  7. 1.6 7km ENE of Cabazon, CA
  8. 1.6 5km NNE of Fontana, CA
  9. 2.6 5km NNE of Fontana, CA
  10. 2.6 5km SE of Loma Linda, CA
  11. 1.8 4km NE of Beaumont, CA
  12. 1.7 4km SE of Yucaipa, CA
  13. 1.6 4km SW of Highland, CA
  14. 1.9 4km SE of Home Gardens, CA
  15. 1.9 7km NW of Big Bear City, 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 4.5 on 2018-05-08 — it released about 140 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.