QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

11km ENE of Trabuco Canyon, CA

· 12 km deep · released about 44 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 28 kmLos Angeles County 91 kmSan Diego County 100 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 2.1 (ml)
Depth
12 km below the surface
Felt
1 report
Nearest
Orange County, 28 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1474 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 44 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 340,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 240,000× the energy of this one
  3. Around the size people start to feel M 3.0 22× the energy of this one
  4. This earthquake M 2.1 about 44 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 33.7045, -117.4778. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 28 km (17 mi) E of here earthquakes near Orange County
Los Angeles County, CA 91 km (56 mi) SE of here earthquakes near Los Angeles County
San Diego County, CA 100 km (62 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

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

  1. 1.6 9km W of Calimesa, CA
  2. 1.9 5km SE of Ontario, CA
  3. 1.9 5km NW of Mira Loma, CA
  4. 1.8 6km NW of San Jacinto, CA
  5. 2.2 3km SW of Pedley, CA
  6. 1.8 8km SSW of Calimesa, CA
  7. 2.8 5km ESE of Yorba Linda, CA
  8. 1.9 5km S of Redlands, CA
  9. 1.8 7km SW of Calimesa, CA
  10. 1.8 5km S of Redlands, CA
  11. 1.5 6km SSW of Chino Hills, CA
  12. 2.3 3km SE of Loma Linda, CA
  13. 1.7 2km SE of Loma Linda, CA
  14. 2.3 4km SE of Loma Linda, CA
  15. 2.5 4km SE of Loma Linda, 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.