QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

13km SE of Anza, CA

· 8.7 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 52 kmRiverside County 62 kmOrange County 113 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 1.6 (ml)
Depth
8.7 km below the surface
Felt
no reports yet
Nearest
San Diego County, 52 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1225 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 9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 9 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 33.4600, -116.5845. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 52 km (32 mi) NNE of here earthquakes near San Diego County
Riverside County, CA 62 km (38 mi) WSW of here earthquakes near Riverside County
Orange County, CA 113 km (70 mi) ESE of here earthquakes near Orange County
Imperial County, CA 123 km (77 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. 1.5 4km NW of Palomar Observatory, CA
  2. 2.1 6km SW of Idyllwild, CA
  3. 1.8 5km S of Idyllwild, CA
  4. 2.4 7km S of Idyllwild, CA
  5. 1.9 6km W of Borrego Springs, CA
  6. 1.9 6km NE of Borrego Springs, CA
  7. 1.5 7km NW of Idyllwild, CA
  8. 1.5 23km ESE of Anza, CA
  9. 1.6 10km N of Borrego Springs, CA
  10. 1.8 8km NNE of Borrego Springs, CA
  11. 1.8 8km SSW of Idyllwild, CA
  12. 1.8 3km SSW of Anza, CA
  13. 2.5 5km NE of Anza, CA
  14. 1.5 12km W of Anza, CA
  15. 2.0 5km SW 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 200,000 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.