QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

6km NW of San Jacinto, CA

· 12 km deep · released about 460 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Orange County 74 kmSan Diego County 91 kmRiverside County 92 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 2.8 (ml)
Depth
12 km below the surface
Felt
48 reports · strongest reported intensity III
Nearest
Orange County, 74 km WSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1933 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 48 people have reported feeling it to USGS.

How big was it?

This earthquake released about 460 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 33,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 23,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 460 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 33.8243, -116.9947. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Orange County, CA 74 km (46 mi) ENE of here earthquakes near Orange County
San Diego County, CA 91 km (57 mi) NNW of here earthquakes near San Diego County
Riverside County, CA 92 km (57 mi) W of here earthquakes near Riverside County
Los Angeles County, CA 124 km (77 mi) ESE of here earthquakes near Los Angeles County
San Bernardino County, CA 137 km (85 mi) SSW 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

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

  1. 1.6 4km NNE of San Bernardino, CA
  2. 1.6 9km SW of Morongo Valley, CA
  3. 1.5 4km SE of Loma Linda, CA
  4. 1.8 5km E of Yucaipa, CA
  5. 1.6 6km W of Big Bear Lake, CA
  6. 2.1 4km SE of Loma Linda, CA
  7. 1.7 4km S of Idyllwild, CA
  8. 1.6 7km E of Cabazon, CA
  9. 3.0 4km SE of Loma Linda, CA
  10. 2.3 11km SSW of Idyllwild, CA
  11. 2.3 10km SSW of Idyllwild, CA
  12. 2.5 11km SSW of Idyllwild, CA
  13. 1.7 5km SSE of Home Gardens, CA
  14. 1.8 9km ENE of Anza, CA
  15. 1.8 10km NW of Anza, 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 350 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.