QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

4km ENE of Lytle Creek, CA

· 10 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 72 kmLos Angeles County 74 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
10 km below the surface
Felt
no reports yet
Nearest
Orange County, 72 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2889 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 51 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 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 34.2692, -117.4607. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 72 km (45 mi) NNE of here earthquakes near Orange County
Los Angeles County, CA 74 km (46 mi) E of here earthquakes near Los Angeles County
San Bernardino County, CA 134 km (83 mi) WSW of here earthquakes near San Bernardino County
Kern County, CA 167 km (104 mi) SE of here earthquakes near Kern County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 6km NNE of Moreno Valley, CA
  2. 1.5 5km SE of Loma Linda, CA
  3. 1.7 5km SSE of Home Gardens, CA
  4. 2.2 6km S of Redlands, CA
  5. 2.6 2km WNW of Adelanto, CA
  6. 1.7 5km SE of Loma Linda, CA
  7. 1.9 5km S of Rancho Cucamonga, CA
  8. 1.6 9km NNW of Big Bear Lake, CA
  9. 2.5 3km N of Muscoy, CA
  10. 1.7 7km NNE of San Dimas, CA
  11. 2.3 7km NNE of San Dimas, CA
  12. 1.6 3km SE of Home Gardens, CA
  13. 2.0 5km SE of Loma Linda, CA
  14. 1.9 3km SW of San Bernardino, CA
  15. 1.6 1km SSW of Colton, 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 2,200 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.