QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7ml

8km ESE of Running Springs, CA

· 7.4 km deep · released about 350 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 89 kmRiverside County 107 kmSan Bernardino County 109 kmLos Angeles County 113 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 2.7 (ml)
Depth
7.4 km below the surface
Felt
25 reports · strongest reported intensity IV
Nearest
Orange County, 89 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1324 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 25 people have reported feeling it to USGS.

How big was it?

This earthquake released about 350 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 43,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 31,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.7× the energy of this one
  4. This earthquake M 2.7 about 350 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 34.1772, -117.0320. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 89 km (55 mi) NE of here earthquakes near Orange County
Riverside County, CA 107 km (67 mi) WNW of here earthquakes near Riverside County
San Bernardino County, CA 109 km (67 mi) SW of here earthquakes near San Bernardino County
Los Angeles County, CA 113 km (70 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

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

  1. 1.6 3km NNW of Fontana, CA
  2. 1.7 15km ENE of Yucaipa, CA
  3. 1.8 5km SW of Devore, CA
  4. 2.8 2km SW of Redlands, CA
  5. 2.1 2km SW of Redlands, CA
  6. 2.5 7km NE of Banning, CA
  7. 1.5 6km ENE of Yucaipa, CA
  8. 1.8 6km ENE of Yucaipa, CA
  9. 1.6 2km ESE of Loma Linda, CA
  10. 2.0 7km NNE of Banning, CA
  11. 1.5 9km SW of Morongo Valley, CA
  12. 1.5 2km SE of Loma Linda, CA
  13. 1.7 11km SSW of Big Bear Lake, CA
  14. 1.6 6km NNE of Cabazon, CA
  15. 1.8 6km NNW of Mira Loma, 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 470 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.