QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

6km SW of Chino Hills, 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 32 kmLos Angeles County 49 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, 32 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3518 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 33.9608, -117.8142. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 32 km (20 mi) N of here earthquakes near Orange County
Los Angeles County, CA 49 km (30 mi) ESE of here earthquakes near Los Angeles County
San Diego County, CA 142 km (88 mi) NW of here earthquakes near San Diego 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. 2.1 2km SE of Brea, CA
  2. 1.5 3km NE of Fontana, CA
  3. 2.1 6km N of Lytle Creek, CA
  4. 1.5 2km NNE of Colton, CA
  5. 1.6 3km NNE of Colton, CA
  6. 2.3 6km WNW of Lytle Creek, CA
  7. 1.7 10km WNW of Corona, CA
  8. 3.0 5km SE of Lytle Creek, CA
  9. 1.6 2km WSW of Lakewood, CA
  10. 1.6 2km SE of Hawthorne, CA
  11. 1.6 4km SE of Home Gardens, CA
  12. 1.8 8km N of Rancho Cucamonga, CA
  13. 1.9 2km NW of Willowbrook, CA
  14. 2.5 6km NNE of Lytle Creek, CA
  15. 1.9 1km SE of Fontana, 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.