QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

14km ESE of Anza, CA

· 9.4 km deep · released about 13 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 55 kmSan Diego County 58 kmOrange County 117 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
9.4 km below the surface
Felt
no reports yet
Nearest
Riverside County, 55 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3623 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 13 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 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 840,000× the energy of this one
  3. Around the size people start to feel M 3.0 75× the energy of this one
  4. This earthquake M 1.8 about 13 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 33.5052, -116.5357. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 55 km (34 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 58 km (36 mi) NNE of here earthquakes near San Diego County
Orange County, CA 117 km (72 mi) E of here earthquakes near Orange County
Imperial County, CA 121 km (75 mi) WNW of here earthquakes near Imperial County

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

Aftershocks so far

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

  1. 2.4 8km NNW of Julian, CA
  2. 2.6 4km WSW of Borrego Springs, CA
  3. 1.8 16km SSE of Hemet, CA
  4. 2.2 17km S of Hemet, CA
  5. 1.9 6km W of Borrego Springs, CA
  6. 1.7 8km SE of Valle Vista, CA
  7. 1.5 12km NNE of Thousand Palms, CA
  8. 2.0 12km NNE of Thousand Palms, CA
  9. 1.7 16km NNE of Borrego Springs, CA
  10. 1.5 12km N of Borrego Springs, CA
  11. 1.5 17km SW of La Quinta, CA
  12. 1.6 7km SSE of Idyllwild, CA
  13. 1.7 8km NE of Aguanga, CA
  14. 1.8 5km SW of Idyllwild, CA
  15. 1.5 12km ENE of Borrego Springs, 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 5.2 on 2016-06-10 — it released about 140,000 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.