QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5ml

17km ESE of Anza, CA

· 13 km deep · released about 5.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 53 kmSan Diego County 59 kmImperial County 119 kmOrange 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 1.5 (ml)
Depth
13 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Riverside County, 53 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1266 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 5.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,900,000× the energy of this one
  3. Around the size people start to feel M 3.0 170× the energy of this one
  4. This earthquake M 1.5 about 5.6 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 33.5007, -116.5055. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 53 km (33 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 59 km (36 mi) NNE of here earthquakes near San Diego County
Imperial County, CA 119 km (74 mi) WNW of here earthquakes near Imperial County
Orange County, CA 119 km (74 mi) E of here earthquakes near Orange County

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

Aftershocks so far

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

  1. 1.5 9km W of Palomar Observatory, CA
  2. 2.0 8km NE of Borrego Springs, CA
  3. 1.6 11km NNW of Julian, CA
  4. 1.6 9km NNW of Anza, CA
  5. 1.7 4km NW of Palomar Observatory, CA
  6. 1.7 21km NNW of Borrego Springs, CA
  7. 1.7 0km E of Julian, CA
  8. 1.6 22km SSW of La Quinta, CA
  9. 1.9 10km NNW of Anza, CA
  10. 1.6 14km SE of Anza, CA
  11. 1.5 13km SE of Anza, CA
  12. 1.6 13km SE of Anza, CA
  13. 1.6 5km ENE of Borrego Springs, CA
  14. 1.7 11km NNE of Julian, CA
  15. 2.6 5km NW of Palomar Observatory, 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 330,000 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.