QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1ml

4km E of Mountain View Acres, CA

· 11 km deep · released about 43 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Los Angeles County 94 kmOrange County 102 kmSan Bernardino County 110 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
11 km below the surface
Felt
1 report · strongest reported intensity II
Nearest
Los Angeles County, 94 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3258 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 43 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 5.8 350,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 250,000× 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 43 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 34.5028, -117.3070. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Los Angeles County, CA 94 km (58 mi) ENE of here earthquakes near Los Angeles County
Orange County, CA 102 km (63 mi) NNE of here earthquakes near Orange County
San Bernardino County, CA 110 km (68 mi) WSW of here earthquakes near San Bernardino County
Riverside County, CA 148 km (92 mi) NW of here earthquakes near Riverside 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. 2.1 6km NE of San Bernardino, CA
  2. 2.5 2km NW of Big Bear City, CA
  3. 1.6 9km NNW of Big Bear Lake, CA
  4. 1.7 13km NNE of Yucaipa, CA
  5. 1.5 5km ENE of Rancho Cucamonga, CA
  6. 2.5 10km N of Lytle Creek, CA
  7. 2.3 1km NNW of Colton, CA
  8. 1.5 6km N of Big Bear City, CA
  9. 1.7 14km SW of Lucerne Valley, CA
  10. 1.7 2km SSE of Muscoy, CA
  11. 2.1 2km NNE of Loma Linda, CA
  12. 2.6 6km ENE of Lake Arrowhead, CA
  13. 1.9 6km ENE of Lake Arrowhead, CA
  14. 1.5 6km NE of Lake Arrowhead, CA
  15. 1.5 6km NE of Lake Arrowhead, 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.