QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

11km SSW of Valle Vista, CA

· 15 km deep · released about 17 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 72 kmOrange County 78 kmRiverside County 86 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
15 km below the surface
Felt
no reports yet
Nearest
San Diego County, 72 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1519 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 17 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 5.8 870,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 620,000× the energy of this one
  3. Around the size people start to feel M 3.0 55× the energy of this one
  4. This earthquake M 1.8 about 17 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 33.6578, -116.9307. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 72 km (45 mi) NNW of here earthquakes near San Diego County
Orange County, CA 78 km (49 mi) E of here earthquakes near Orange County
Riverside County, CA 86 km (54 mi) W of here earthquakes near Riverside County

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

Aftershocks so far

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

  1. 2.1 8km NE of Cabazon, CA
  2. 1.8 17km ESE of Anza, CA
  3. 3.4 17km ESE of Anza, CA
  4. 2.3 17km ESE of Anza, CA
  5. 2.5 9km ENE of Yucaipa, CA
  6. 1.7 20km SW of La Quinta, CA
  7. 1.6 8km SE of Valle Vista, CA
  8. 1.6 10km S of Idyllwild, CA
  9. 2.0 4km W of Banning, CA
  10. 2.2 17km ESE of Anza, CA
  11. 1.9 17km ESE of Anza, CA
  12. 1.9 4km S of Mentone, CA
  13. 2.3 8km NE of Aguanga, CA
  14. 1.6 9km NE of Aguanga, CA
  15. 2.3 4km S of Mentone, 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 4.9 on 2020-04-04 — it released about 35,000 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.