QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3ml

1km SW of Mira Loma, CA

· 11 km deep · released about 74 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 41 kmLos Angeles County 72 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 2.3 (ml)
Depth
11 km below the surface
Felt
74 reports · strongest reported intensity III
Nearest
Orange County, 41 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3258 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 74 people have reported feeling it to USGS.

How big was it?

This earthquake released about 74 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 140,000× the energy of this one
  3. Around the size people start to feel M 3.0 13× the energy of this one
  4. This earthquake M 2.3 about 74 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 33.9840, -117.5260. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 41 km (26 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 72 km (45 mi) ESE of here earthquakes near Los Angeles County
San Diego County, CA 127 km (79 mi) NNW 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

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

  1. 2.0 1km NNE of Calimesa, CA
  2. 1.7 6km ENE of Lake Arrowhead, CA
  3. 1.8 4km E of Running Springs, CA
  4. 2.3 5km S of Lytle Creek, CA
  5. 2.2 2km N of Colton, CA
  6. 1.5 4km SE of Home Gardens, CA
  7. 2.1 3km E of Norco, CA
  8. 1.6 1km SW of Colton, CA
  9. 2.2 3km ENE of North Tustin, CA
  10. 1.6 2km SE of Redlands, CA
  11. 1.8 2km ENE of Colton, CA
  12. 1.8 4km NNE of Moreno Valley, CA
  13. 1.6 1km NNW of Loma Linda, CA
  14. 2.4 2km SE of Redlands, CA
  15. 1.5 2km SSE of Redlands, 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.