QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

9km N of Idyllwild, CA

· 13 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 69 kmSan Diego County 89 kmOrange County 98 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
13 km below the surface
Felt
no reports yet
Nearest
Riverside County, 69 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1285 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 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× 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 33.8210, -116.7370. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 69 km (43 mi) W of here earthquakes near Riverside County
San Diego County, CA 89 km (55 mi) N of here earthquakes near San Diego County
Orange County, CA 98 km (61 mi) E of here earthquakes near Orange County
San Bernardino County, CA 126 km (78 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. 1.5 15km ESE of Anza, CA
  2. 2.1 12km WNW of Morongo Valley, CA
  3. 1.6 13km WNW of Anza, CA
  4. 2.9 6km SW of Idyllwild, CA
  5. 1.7 4km SW of Idyllwild, CA
  6. 2.2 8km SSW of Cabazon, CA
  7. 1.5 14km ESE of Anza, CA
  8. 2.0 19km ESE of Anza, CA
  9. 2.1 19km ESE of Anza, CA
  10. 1.5 10km S of Idyllwild, CA
  11. 3.6 12km NNE of Banning, CA
  12. 1.7 20km ESE of Anza, CA
  13. 2.0 8km NW of Morongo Valley, CA
  14. 1.5 6km NNW of Cabazon, CA
  15. 2.6 4km SSW 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 4.9 on 2020-04-04 — it released about 40,000 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.