QuakeIndex

Earthquake · reviewed by a seismologist

M 3.1ml

2km ESE of Loma Linda, CA

· 18 km deep · released about 1,400 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 64 kmLos Angeles County 96 kmRiverside County 119 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 3.1 (ml)
Depth
18 km below the surface
Felt
119 reports · strongest reported intensity IV
Measured shaking
intensity IV (ShakeMap)
Nearest
Orange County, 64 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3371 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 119 people have reported feeling it to USGS.

How big was it?

This earthquake released about 1,400 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.1 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 240,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 11,000× the energy of this one
  3. Magna, Utah 2020 M 5.7 7,700× the energy of this one
  4. This earthquake M 3.1 about 1,400 lb of TNT
  5. Around the size people start to feel M 3.0 this one released 1.5× more

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 34.0397, -117.2405. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 64 km (40 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 96 km (59 mi) E of here earthquakes near Los Angeles County
Riverside County, CA 119 km (74 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 121 km (75 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 133 km (83 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

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

  1. 1.5 5km SE of Home Gardens, CA
  2. 1.5 8km SSE of Big Bear City, CA
  3. 2.1 7km SE of Big Bear City, CA
  4. 2.8 2km SE of Loma Linda, CA
  5. 1.6 2km ESE of Loma Linda, CA
  6. 1.8 7km WSW of Beaumont, CA
  7. 1.8 5km SSE of Lytle Creek, CA
  8. 2.1 12km SE of Running Springs, CA
  9. 1.6 14km NNE of Running Springs, CA
  10. 1.5 7km NNE of Banning, CA
  11. 1.7 8km ESE of Yucaipa, CA
  12. 1.6 1 km ESE of Loma Linda, California
  13. 1.6 5 km S of Banning, California
  14. 2.6 2 km NW of San Jacinto, California
  15. 1.5 6 km SSE of Lytle Creek, California

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 4.4 on 2016-01-06 — it released about 83 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.