QuakeIndex

quarry blast · reviewed by a seismologist

M 1.7ml

5km SSE of Home Gardens, CA

· 2.6 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 31 kmLos Angeles County 81 kmSan Diego County 112 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
2.6 km below the surface
Felt
no reports yet
Nearest
Orange County, 31 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1340 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 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 33.8342, -117.4980. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 31 km (19 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 81 km (50 mi) ESE of here earthquakes near Los Angeles County
San Diego County, CA 112 km (70 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

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

  1. 1.5 2 km SSW of Brea, CA
  2. 1.5 2km ESE of Home Gardens, CA
  3. 1.5 7km SSW of Lytle Creek, CA
  4. 1.7 6km SSW of Redlands, CA
  5. 1.9 6 km SSE of Home Gardens, CA
  6. 1.7 2km SSE of Loma Linda, CA
  7. 1.6 3km ESE of Home Gardens, CA
  8. 1.5 12km ENE of North Tustin, CA
  9. 1.6 1km ESE of Redlands, CA
  10. 1.7 7km NNE of Fontana, CA
  11. 1.7 10km WSW of Corona, CA
  12. 2.1 4km SW of Lytle Creek, CA
  13. 1.7 0km NW of Loma Linda, CA
  14. 1.5 2km S of Home Gardens, CA
  15. 2.3 8km WSW of Lytle Creek, 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 4.4 on 2018-08-29 — it released about 11,000 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.