QuakeIndex

quarry blast · automatic estimate, may change

M 1.8ml

4km SE of Home Gardens, CA

· 2.2 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 32 kmLos Angeles County 81 kmSan Diego County 113 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 1.8 (ml)
Depth
2.2 km below the surface
Felt
no reports yet
Nearest
Orange County, 32 km SW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 2608 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 33.8480, -117.4942. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 32 km (20 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 113 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

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

  1. 2.2 4km NNW of Mira Loma, CA
  2. 1.6 5km SE of Home Gardens, CA
  3. 1.9 3km NE of Grand Terrace, CA
  4. 2.0 5km N of Beaumont, CA
  5. 2.2 4km WSW of Pedley, CA
  6. 2.0 4km WSW of Pedley, CA
  7. 1.5 4km S of Mira Loma, CA
  8. 2.0 5km SSE of Loma Linda, CA
  9. 1.5 3km NNW of Mira Loma, CA
  10. 1.6 3km NNW of Mira Loma, CA
  11. 1.7 6km SSW of Redlands, CA
  12. 1.5 5km SE of Home Gardens, CA
  13. 1.6 6km SE of Ontario, CA
  14. 4.0 1km ESE of Wildomar, CA
  15. 1.6 10km NE of North Tustin, 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 7,400 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.