QuakeIndex

quarry blast · reviewed by a seismologist

M 1.7ml

4km SSE of Home Gardens, CA

· 2.3 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 32 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 1.7 (ml)
Depth
2.3 km below the surface
Felt
no reports yet
Nearest
Orange County, 32 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1668 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 11 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 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 33.8492, -117.4978. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 32 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

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

  1. 1.7 3km SW of Orange, CA
  2. 1.6 4km SE of Home Gardens, CA
  3. 1.5 4km SE of Home Gardens, CA
  4. 2.0 5km SSW of Lytle Creek, CA
  5. 1.6 3km SE of South Whittier, CA
  6. 1.6 1km NE of Mira Loma, CA
  7. 1.6 6km NW of Glen Avon, CA
  8. 1.7 5km N of Lake Elsinore, CA
  9. 1.9 4km N of Fountain Valley, CA
  10. 1.5 4km SE of Home Gardens, CA
  11. 2.6 4km SSW of Redlands, CA
  12. 1.7 8km ESE of Yorba Linda, CA
  13. 1.6 3km WNW of Beaumont, CA
  14. 1.8 1km W of Yorba Linda, CA
  15. 1.9 8km WSW of Corona, 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 9,800 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.