QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

13km SE of Big Bear City, CA

· 0.5 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 85 kmSan Bernardino County 90 kmOrange County 112 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 1.7 (ml)
Depth
0.5 km below the surface
Felt
no reports yet
Nearest
Riverside County, 85 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1832 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 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 34.1860, -116.7350. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 85 km (53 mi) NW of here earthquakes near Riverside County
San Bernardino County, CA 90 km (56 mi) SW of here earthquakes near San Bernardino County
Orange County, CA 112 km (69 mi) ENE of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 2.9 2km N of Yucaipa, CA
  2. 2.2 5km ENE of Calimesa, CA
  3. 1.6 3km WSW of Yucca Valley, CA
  4. 1.9 36km WSW of Ludlow, CA
  5. 1.8 6km SSW of Redlands, CA
  6. 1.5 13km NNE of Thousand Palms, CA
  7. 2.7 6km SSW of Redlands, CA
  8. 2.0 13km SE of Big Bear City, CA
  9. 1.8 7km S of Redlands, CA
  10. 1.6 36km N of Yucca Valley, CA
  11. 1.8 11km WSW of Morongo Valley, CA
  12. 1.6 4km W of Yucaipa, CA
  13. 2.0 4km W of Yucaipa, CA
  14. 1.8 3km E of Calimesa, CA
  15. 2.6 9km ESE 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 18,000 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.