QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

7km SSE of Redlands, CA

· 15 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 67 kmLos Angeles County 104 kmRiverside County 111 kmSan Diego County 113 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
15 km below the surface
Felt
no reports yet
Nearest
Orange County, 67 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1651 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 9.6 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 1,600,000× 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 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 33.9908, -117.1635. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 67 km (41 mi) ENE of here earthquakes near Orange County
Los Angeles County, CA 104 km (64 mi) ESE of here earthquakes near Los Angeles County
Riverside County, CA 111 km (69 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 113 km (70 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

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

  1. 2.3 10km WNW of Big Bear Lake, CA
  2. 2.0 5km SSW of Lytle Creek, CA
  3. 1.6 10km WNW of Big Bear Lake, CA
  4. 1.6 1km NE of Mira Loma, CA
  5. 1.6 6km NW of Glen Avon, CA
  6. 2.5 9km SSE of Running Springs, CA
  7. 1.7 5km N of Lake Elsinore, CA
  8. 1.5 4km SSE of Beaumont, CA
  9. 1.5 4km SE of Home Gardens, CA
  10. 1.9 3km ESE of Valle Vista, CA
  11. 2.6 10km SW of Morongo Valley, CA
  12. 1.7 7km SE of Valle Vista, CA
  13. 2.6 4km SSW of Redlands, CA
  14. 1.5 7km SSE of Banning, CA
  15. 1.7 11km WNW of Garnet, 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 17,000 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.