QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9ml

12km WNW of Big Bear Lake, CA

· 2.3 km deep · released about 23 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 98 kmOrange County 99 kmRiverside County 113 kmLos Angeles County 115 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 1.9 (ml)
Depth
2.3 km below the surface
Felt
no reports yet
Nearest
San Bernardino County, 98 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1566 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 23 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 660,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 470,000× the energy of this one
  3. Around the size people start to feel M 3.0 42× the energy of this one
  4. This earthquake M 1.9 about 23 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 34.3025, -117.0180. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 98 km (61 mi) SW of here earthquakes near San Bernardino County
Orange County, CA 99 km (61 mi) NE of here earthquakes near Orange County
Riverside County, CA 113 km (70 mi) NW of here earthquakes near Riverside County
Los Angeles County, CA 115 km (71 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

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

  1. 2.2 1km SSE of Colton, CA
  2. 2.2 1km SE of Loma Linda, CA
  3. 1.6 5km E of Cabazon, CA
  4. 2.0 2km SSE of Big Bear City, CA
  5. 1.7 1km NNW of Loma Linda, CA
  6. 1.7 1km WSW of Loma Linda, CA
  7. 2.3 8km ENE of Big Bear City, CA
  8. 1.8 8km ENE of Big Bear City, CA
  9. 1.5 8km N of Big Bear City, CA
  10. 2.5 8km ENE of Big Bear City, CA
  11. 2.0 8km ENE of Big Bear City, CA
  12. 1.5 7km S of Lytle Creek, CA
  13. 1.7 4km NE of Loma Linda, CA
  14. 1.8 5km S of Loma Linda, CA
  15. 1.8 12km SW of Big Bear Lake, 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 7,200 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.