QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

17km S of Big Bear City, CA

· 6.3 km deep · released about 17 lb of TNT

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10 km30 km60 km120 km N Riverside County 87 kmOrange County 100 kmSan Bernardino County 102 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
6.3 km below the surface
Felt
no reports yet
Nearest
Riverside County, 87 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1865 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 17 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 5.8 900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 640,000× the energy of this one
  3. Around the size people start to feel M 3.0 57× the energy of this one
  4. This earthquake M 1.8 about 17 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 34.1122, -116.8250. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 87 km (54 mi) WNW of here earthquakes near Riverside County
Orange County, CA 100 km (62 mi) ENE of here earthquakes near Orange County
San Bernardino County, CA 102 km (63 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

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

  1. 2.0 3km SE of Loma Linda, CA
  2. 1.7 6km NE of Cabazon, CA
  3. 1.8 13km SE of Big Bear City, CA
  4. 1.5 2km E of Yucaipa, CA
  5. 2.5 6km E of Yucaipa, CA
  6. 2.2 13km SE of Big Bear City, CA
  7. 1.7 13km SE of Big Bear City, CA
  8. 1.5 13km SE of Big Bear City, CA
  9. 1.5 13km SE of Big Bear City, CA
  10. 2.1 3km SW of San Bernardino, CA
  11. 1.6 3km E of Loma Linda, CA
  12. 1.7 3km WSW of Yucaipa, CA
  13. 1.6 7km NW of Big Bear City, CA
  14. 2.2 5km N of Moreno Valley, CA
  15. 2.4 7km 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 4.5 on 2018-05-08 — it released about 9,800 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.