QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

4km SE of Loma Linda, CA

· 17 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 63 kmLos Angeles County 97 kmRiverside County 118 kmSan Diego 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 1.8 (ml)
Depth
17 km below the surface
Felt
no reports yet
Nearest
Orange County, 63 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1523 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 34.0208, -117.2345. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 63 km (39 mi) NE of here earthquakes near Orange County
Los Angeles County, CA 97 km (60 mi) ESE of here earthquakes near Los Angeles County
Riverside County, CA 118 km (73 mi) WNW of here earthquakes near Riverside County
San Diego County, CA 119 km (74 mi) NNW of here earthquakes near San Diego County
San Bernardino County, CA 134 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

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

  1. 1.8 10km NNW of Big Bear City, CA
  2. 2.3 4km S of Mentone, CA
  3. 2.1 11km ENE of Trabuco Canyon, CA
  4. 2.1 6km N of Fontana, CA
  5. 1.7 3km S of Hemet, CA
  6. 1.6 5km E of Yucaipa, CA
  7. 1.6 1km NW of Beaumont, CA
  8. 1.8 9km NE of Cabazon, CA
  9. 2.0 5km NW of Mira Loma, CA
  10. 1.6 7km SSE of Home Gardens, CA
  11. 1.8 15km WNW of Morongo Valley, CA
  12. 2.1 3km W of Devore, CA
  13. 1.6 6km NNE of Beaumont, CA
  14. 3.2 8km NNE of Banning, CA
  15. 1.9 2km WNW of Beaumont, 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 11,000 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.