QuakeIndex

quarry blast · reviewed by a seismologist

M 1.8ml

10km NNW of Big Bear Lake, CA

· -1.4 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 90 kmOrange County 107 kmRiverside County 109 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 1.8 (ml)
Depth
-1.4 km below the surface
Felt
no reports yet
Nearest
San Bernardino County, 90 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2985 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 14 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 760,000× the energy of this one
  3. Around the size people start to feel M 3.0 68× the energy of this one
  4. This earthquake M 1.8 about 14 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 34.3335, -116.9370. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 90 km (56 mi) SW of here earthquakes near San Bernardino County
Orange County, CA 107 km (66 mi) NE of here earthquakes near Orange County
Riverside County, CA 109 km (68 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

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

  1. 1.9 6km E of Calimesa, CA
  2. 2.9 13km N of Cabazon, CA
  3. 1.7 12km N of Cabazon, CA
  4. 1.7 8km S of Hesperia, CA
  5. 1.7 7km N of Running Springs, CA
  6. 1.5 15km NNE of Apple Valley, CA
  7. 1.6 6km N of Beaumont, CA
  8. 1.6 4km ENE of Calimesa, CA
  9. 1.7 10km SSW of Lucerne Valley, CA
  10. 2.0 7km NNW of Big Bear Lake, CA
  11. 1.8 3km W of Cabazon, CA
  12. 2.2 3km ENE of Calimesa, CA
  13. 1.8 11km ESE of Running Springs, CA
  14. 1.7 11km N of Cabazon, CA
  15. 1.8 6km S of Redlands, 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 8,200 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.