QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

4km SSW of Redlands, CA

· 16 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 66 kmLos Angeles County 100 kmRiverside County 115 kmSan Diego County 117 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 1.5 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Orange County, 66 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1678 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

How big was it?

This earthquake released about 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 34.0197, -117.1953. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 66 km (41 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 100 km (62 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 115 km (71 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 117 km (73 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 132 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

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

  1. 1.5 5km SSE of Home Gardens, CA
  2. 1.7 11km NE of Yucaipa, CA
  3. 2.2 8km SSW of Calimesa, CA
  4. 1.6 11km NW of Big Bear Lake, CA
  5. 1.8 2km NW of Loma Linda, CA
  6. 1.8 6km ENE of Beaumont, CA
  7. 1.8 17km SE of Big Bear City, CA
  8. 1.5 17km SE of Big Bear City, CA
  9. 1.8 7km SSW of Cabazon, CA
  10. 1.6 6km E of Calimesa, CA
  11. 1.6 2km NNW of Loma Linda, CA
  12. 1.8 4km SE of Home Gardens, CA
  13. 1.5 2km S of Devore, CA
  14. 1.9 4km SW of Cabazon, CA
  15. 1.6 8km ESE 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 4.5 on 2018-05-08 — it released about 28,000 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.