QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

2km SW of Redlands, CA

· 12 km deep · released about 460 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 67 kmLos Angeles County 99 kmRiverside County 116 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 2.8 (ml)
Depth
12 km below the surface
Felt
228 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
Orange County, 67 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1263 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 228 people have reported feeling it to USGS.

How big was it?

This earthquake released about 460 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 33,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 23,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 460 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 34.0393, -117.2003. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 67 km (42 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 99 km (62 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 116 km (72 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 130 km (81 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. 1.5 3km W of Devore, CA
  2. 1.6 4km S of Banning, CA
  3. 1.7 5km SSW of Redlands, CA
  4. 1.6 2km E of Loma Linda, CA
  5. 1.6 1km W of Cabazon, CA
  6. 1.6 6km SE of Loma Linda, CA
  7. 1.8 9km N of Idyllwild, CA
  8. 2.0 5km NNE of Banning, CA
  9. 1.7 14km W of Morongo Valley, CA
  10. 1.5 6km NE of Beaumont, CA
  11. 1.8 10km NW of San Jacinto, CA
  12. 1.9 9km WNW of Big Bear Lake, CA
  13. 1.6 8km ESE of Big Bear City, CA
  14. 2.3 6km NNW of Mira Loma, CA
  15. 1.6 3km ESE of Loma Linda, 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 350 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.