QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

9km NNW of Rancho Cucamonga, CA

· 9.7 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 61 kmOrange County 61 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
9.7 km below the surface
Felt
no reports yet
Nearest
Los Angeles County, 61 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2985 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 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 92× 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 34.2037, -117.6003. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 61 km (38 mi) E of here earthquakes near Los Angeles County
Orange County, CA 61 km (38 mi) NNE of here earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 2.0 6km NW of Highland, CA
  2. 1.5 3km ESE of Home Gardens, CA
  3. 1.6 6km SSW of Redlands, CA
  4. 2.1 4km NW of Glen Avon, CA
  5. 2.4 6km SE of Ontario, CA
  6. 1.7 6km SE of Ontario, CA
  7. 2.1 2km SSE of Devore, CA
  8. 1.7 3km SE of Loma Linda, CA
  9. 1.6 4km SE of Home Gardens, CA
  10. 2.1 6km SE of Ontario, CA
  11. 1.6 6km SE of Ontario, CA
  12. 2.5 6km SE of Ontario, CA
  13. 3.6 6km SE of Ontario, CA
  14. 2.0 2km SE of Loma Linda, CA
  15. 1.9 9km WSW of Wrightwood, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.