QuakeIndex

quarry blast · reviewed by a seismologist

M 1.6ml

9km N of Big Bear City, CA

· -1.3 km deep · released about 8.1 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Bernardino County 83 kmRiverside County 103 kmOrange County 114 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 1.6 (ml)
Depth
-1.3 km below the surface
Felt
no reports yet
Nearest
San Bernardino County, 83 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2706 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 8.1 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,900,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,300,000× the energy of this one
  3. Around the size people start to feel M 3.0 120× the energy of this one
  4. This earthquake M 1.6 about 8.1 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 34.3423, -116.8423. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Bernardino County, CA 83 km (52 mi) SW of here earthquakes near San Bernardino County
Riverside County, CA 103 km (64 mi) NW of here earthquakes near Riverside County
Orange County, CA 114 km (71 mi) NE of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 2.2 4km E of Yucca Valley, CA
  2. 1.9 5km NNE of Cabazon, CA
  3. 1.7 4km WSW of Morongo Valley, CA
  4. 1.5 8km ENE of Yucaipa, CA
  5. 1.7 4km SE of Loma Linda, CA
  6. 2.3 5km E of Cabazon, CA
  7. 2.0 10km NNE of Yucaipa, CA
  8. 1.7 10km SE of Running Springs, CA
  9. 1.8 3km ENE of Colton, CA
  10. 2.5 6km NNE of San Bernardino, CA
  11. 1.7 3km S of Redlands, CA
  12. 1.6 16km NNE of Apple Valley, CA
  13. 1.9 8km NNE of Big Bear City, CA
  14. 1.6 7km NW of Big Bear City, CA
  15. 2.2 7km NW of Big Bear City, 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 20,000 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.