QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9km W of Big Bear Lake, CA

· 7.1 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 96 kmSan Bernardino County 101 kmRiverside County 109 kmLos Angeles 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 1.8 (ml)
Depth
7.1 km below the surface
Felt
no reports yet
Nearest
Orange County, 96 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3769 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 13 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 5.7 810,000× the energy of this one
  3. Around the size people start to feel M 3.0 72× the energy of this one
  4. This earthquake M 1.8 about 13 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 34.2512, -117.0050. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 96 km (59 mi) NE of here earthquakes near Orange County
San Bernardino County, CA 101 km (63 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 109 km (68 mi) WNW of here earthquakes near Riverside County
Los Angeles County, CA 116 km (72 mi) E of here earthquakes near Los Angeles County

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

Aftershocks so far

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

  1. 1.9 5km NE of Cabazon, CA
  2. 1.8 3km SSW of Big Bear City, CA
  3. 1.6 2km SW of San Bernardino, CA
  4. 1.7 11km SSW of Lucerne Valley, CA
  5. 1.5 2km NNE of Lake Arrowhead, CA
  6. 1.6 9km NNW of Cabazon, CA
  7. 1.5 13km WNW of Morongo Valley, CA
  8. 1.6 10km NNE of Running Springs, CA
  9. 2.2 10km N of Big Bear Lake, CA
  10. 1.5 5km NNE of Fontana, CA
  11. 2.0 12km SSE of Big Bear City, CA
  12. 1.5 2km S of Lytle Creek, CA
  13. 1.8 6km SSE of Mentone, CA
  14. 1.7 7km ENE of Yucaipa, CA
  15. 1.5 5km E 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 8,800 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.