QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

6km SSW of Redlands, CA

· 16 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 65 kmLos Angeles County 100 kmRiverside County 114 kmSan Diego 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 1.7 (ml)
Depth
16 km below the surface
Felt
no reports yet
Nearest
Orange County, 65 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2572 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 10 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 34.0038, -117.1968. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 65 km (40 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 100 km (62 mi) ESE of here earthquakes near Los Angeles County
Riverside County, CA 114 km (71 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 116 km (72 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 133 km (83 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

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

  1. 1.8 8km N of Big Bear Lake, CA
  2. 1.5 5km SSE of Home Gardens, CA
  3. 1.8 2km NW of Cabazon, CA
  4. 1.7 7km NE of Moreno Valley, CA
  5. 1.7 1km SW of Calimesa, CA
  6. 1.6 10km NNW of Big Bear City, CA
  7. 1.9 11km NW of Big Bear Lake, CA
  8. 2.0 8km NNW of Cabazon, CA
  9. 1.6 9km SE of Valle Vista, CA
  10. 1.6 3km NNW of Mira Loma, CA
  11. 1.8 6km N of Beaumont, CA
  12. 1.6 5 km SE of Home Gardens, CA
  13. 1.9 3km NE of San Jacinto, CA
  14. 1.7 4km NNW of Glen Avon, CA
  15. 1.5 10km ENE of Yucaipa, 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 16,000 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.