QuakeIndex

quarry blast · reviewed by a seismologist

M 1.6ml

4km SE of Home Gardens, CA

· -0.5 km deep · released about 6.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 33 kmLos Angeles County 80 kmSan Diego County 114 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 1.6 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Orange County, 33 km SW
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.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 6.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.6 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 33.8525, -117.4963. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 33 km (20 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 80 km (50 mi) ESE of here earthquakes near Los Angeles County
San Diego County, CA 114 km (71 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

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

  1. 1.8 8km N of Rancho Cucamonga, CA
  2. 1.9 1km SE of Fontana, CA
  3. 1.9 4km NW of Beaumont, CA
  4. 2.0 4km ESE of Yucaipa, CA
  5. 1.7 1km SSE of Loma Linda, CA
  6. 1.5 14km N of La Verne, CA
  7. 2.7 1km E of Brea, CA
  8. 1.9 1km ENE of Brea, CA
  9. 1.7 7km SSW of Redlands, CA
  10. 1.7 4km W of Calimesa, CA
  11. 1.8 7km NW of Lakeland Village, CA
  12. 1.7 3km SE of Loma Linda, CA
  13. 1.8 4km SE of Home Gardens, CA
  14. 1.8 8km NE of Nuevo, CA
  15. 2.2 5km ESE of Rancho Cucamonga, 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.