QuakeIndex

quarry blast · reviewed by a seismologist

M 1.5ml

Earthquake near Home Gardens, CA

No earthquake was likely felt in Home Gardens in the 24 hours to 8:03 am PST (16:03 UTC). The last one was M 1.6, 7 km (4 mi) SSE, at 1:57 pm PST on 6 November 2026, estimated intensity II (weak) in town. Every earthquake near Home Gardens

No: USGS classifies this as a quarry blast, not an earthquake. A magnitude 1.5 quarry blast was recorded in Home Gardens, CA, at 1:32 pm PDT on 13 August 2018 (20:32 UTC), less than 1 km deep.

USGS: 2km SE of Home Gardens, CA

5 km (3 mi) E of Corona, CA · 85 km (53 mi) ESE of Los Angeles, CA

1:32 pm PDT, Aug 13, 2018 · · -0.5 km deep · released about 5.6 lb of TNT

Every earthquake near Home Gardens Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 32 kmLos Angeles County 79 kmSan Diego County 116 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
1:32 pm PDT on 13 August 2018 ()
Where
in Home Gardens, CA · earthquakes near Home Gardens
Magnitude
M 1.5 (ml)
Depth
-0.5 km below the surface
Felt
no reports yet
Nearest
Orange County, 32 km SW
Nearest mapped fault
Elsinore fault, 7 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3013 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 10 km (6 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Corona 5 km, intensity II · Norco 8 km, intensity II. Estimated for each town centre; each link is that town's own record.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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.

For this area

No earthquake of M4 or more has been recorded within 50 km since our catalogue begins in 2016.

Before 2016, the USGS record lists 11 earthquakes of M5 or more within 50 km; the five largest:

  1. 6.2 3 km SE of San Bernardino, California · 34 km NE of this epicentre
  2. 6.0 The 1910 Lake Elsinore, California Earthquake · 21 km SSE of this epicentre
  3. 5.5 The 1990 Upland, California Earthquake · 36 km NNW of this epicentre
  4. 5.4 5km S of Chino Hills, CA · 25 km WNW of this epicentre
  5. 5.2 8km ENE of Trabuco Canyon, CA · 18 km S of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 33.8645, -117.5092. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Orange County, CA 32 km (20 mi) SW earthquakes near Orange County
Los Angeles County, CA 79 km (49 mi) WNW earthquakes near Los Angeles County
San Diego County, CA 116 km (72 mi) SE 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. 2.0 4km ENE of Calimesa, CA
  2. 1.5 2km ESE of Calimesa, CA
  3. 1.7 8km SSE of Home Gardens, CA
  4. 1.6 5km SE of Home Gardens, CA
  5. 1.5 7km SSE of Home Gardens, CA
  6. 1.6 12km SSE of Corona, CA
  7. 1.7 7km SSW of Redlands, CA
  8. 1.9 4km N of La Verne, CA
  9. 2.1 7km WSW of Calimesa, CA
  10. 1.7 4km ENE of Calimesa, CA
  11. 3.5 4km ENE of Calimesa, CA
  12. 2.1 9km ENE of North Tustin, CA
  13. 3.6 4km ENE of Calimesa, CA
  14. 1.8 8km E of Yorba Linda, CA
  15. 2.1 7km W of Calimesa, 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.