QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

3km W of Calimesa, CA

· 16 km deep · released about 47 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 73 kmRiverside County 104 kmLos Angeles County 111 kmSan Diego County 111 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
16 km below the surface
Felt
no reports yet
Nearest
Orange County, 73 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1942 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 33.9922, -117.0828. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 73 km (45 mi) ENE of here earthquakes near Orange County
Riverside County, CA 104 km (65 mi) WNW of here earthquakes near Riverside County
Los Angeles County, CA 111 km (69 mi) ESE of here earthquakes near Los Angeles County
San Diego County, CA 111 km (69 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 127 km (79 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

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

  1. 1.7 6km NW of Corona, CA
  2. 1.6 12km E of Yucaipa, CA
  3. 1.9 11km SSE of Big Bear Lake, CA
  4. 1.8 11km NNE of Trabuco Canyon, CA
  5. 1.5 9km N of Cabazon, CA
  6. 1.9 6km E of Calimesa, CA
  7. 1.8 9km SSE of Cabazon, CA
  8. 2.1 3km SW of Morongo Valley, CA
  9. 1.6 4km SE of Home Gardens, CA
  10. 1.6 5km NNE of Running Springs, CA
  11. 2.4 5km NNE of Running Springs, CA
  12. 1.5 5km NW of Fontana, CA
  13. 1.6 1km N of Loma Linda, CA
  14. 1.8 5km NNW of Fontana, CA
  15. 1.9 6km SW of Fontana, 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 4.5 on 2018-05-08 — it released about 3,500 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.