QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

5km SSE of Mentone, CA

· 15 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 72 kmLos Angeles County 106 kmRiverside County 109 kmSan Diego County 116 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
15 km below the surface
Felt
no reports yet
Nearest
Orange County, 72 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3141 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 47 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 5.8 320,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 230,000× the energy of this one
  3. Around the size people start to feel M 3.0 20× the energy of this one
  4. This earthquake M 2.1 about 47 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 34.0293, -117.1242. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 72 km (45 mi) ENE of here earthquakes near Orange County
Los Angeles County, CA 106 km (66 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 109 km (68 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 116 km (72 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

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

  1. 1.5 9km NE of Big Bear City, CA
  2. 2.3 5km SSE of Mentone, CA
  3. 1.9 11km SSE of Lucerne Valley, CA
  4. 2.6 1km SSW of Loma Linda, CA
  5. 1.8 3km SE of San Jacinto, CA
  6. 1.7 4km SE of San Jacinto, CA
  7. 2.0 4km SE of San Jacinto, CA
  8. 2.6 7km NW of Big Bear Lake, CA
  9. 1.7 3km SE of San Jacinto, CA
  10. 1.8 2km E of Menifee, CA
  11. 1.7 8km N of Big Bear City, CA
  12. 1.6 12km NE of Trabuco Canyon, CA
  13. 2.7 3km NNW of Beaumont, CA
  14. 1.8 16km NW of Morongo Valley, CA
  15. 1.8 6km ENE of Yucaipa, 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 2,500 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.