QuakeIndex

Earthquake · reviewed by a seismologist

M 3.3ml

3km S of Mentone, CA

· 13 km deep · released about 1.5 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 72 kmLos Angeles County 105 kmRiverside County 111 kmSan Diego County 118 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 3.3 (ml)
Depth
13 km below the surface
Felt
572 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
Nearest
Orange County, 72 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3057 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 572 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1.5 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 110,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 4,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 3,500× the energy of this one
  4. This earthquake M 3.3 about 1.5 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 3.2× more

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 34.0448, -117.1400. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 72 km (45 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 105 km (65 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 111 km (69 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 118 km (74 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 126 km (78 mi) SW of here earthquakes near San Bernardino County

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

Aftershocks so far

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

  1. 2.5 3km ENE of Upland, CA
  2. 1.7 7km N of Big Bear City, CA
  3. 1.5 9km NE of Big Bear City, CA
  4. 2.3 5km SSE of Mentone, CA
  5. 1.9 11km SSE of Lucerne Valley, CA
  6. 2.6 1km SSW of Loma Linda, CA
  7. 1.8 3km SE of San Jacinto, CA
  8. 1.7 4km SE of San Jacinto, CA
  9. 2.0 4km SE of San Jacinto, CA
  10. 2.6 7km NW of Big Bear Lake, CA
  11. 1.7 3km SE of San Jacinto, CA
  12. 1.8 2km E of Menifee, CA
  13. 1.7 8km N of Big Bear City, CA
  14. 1.6 12km NE of Trabuco Canyon, CA
  15. 2.7 3km NNW of Beaumont, 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 2016-01-06 — it released about 38 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.