QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

11km NNE of Trabuco Canyon, CA

· 7.6 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 24 kmLos Angeles County 84 kmSan Diego County 107 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
7.6 km below the surface
Felt
no reports yet
Nearest
Orange County, 24 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1896 days ago

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

How big was it?

This earthquake released about 16 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 5.8 930,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 660,000× the energy of this one
  3. Around the size people start to feel M 3.0 59× the energy of this one
  4. This earthquake M 1.8 about 16 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 33.7522, -117.5295. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 24 km (15 mi) ENE of here earthquakes near Orange County
Los Angeles County, CA 84 km (52 mi) SE of here earthquakes near Los Angeles County
San Diego County, CA 107 km (67 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. 2.0 4km SE of Home Gardens, CA
  2. 1.9 3km WNW of Fontana, CA
  3. 2.2 5km N of Moreno Valley, CA
  4. 2.4 7km S of Redlands, CA
  5. 1.5 4km NW of Fontana, CA
  6. 1.7 6km NW of San Jacinto, CA
  7. 1.8 4km SSE of Home Gardens, CA
  8. 1.8 5km SSE of Home Gardens, CA
  9. 1.9 3km NNW of Rancho Cucamonga, CA
  10. 1.5 5km N of Lake Elsinore, CA
  11. 1.8 8km ENE of Moreno Valley, CA
  12. 1.8 5km NNW of Glen Avon, CA
  13. 1.6 4km SE of Rancho Cucamonga, CA
  14. 2.3 5km NE of Wildomar, CA
  15. 1.7 5km SSE of Home Gardens, 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 6,900 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.