QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

15 km SSW of Alpine Village, California

· 13 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 55 kmRiverside County 56 kmImperial County 118 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 1.6 (ml)
Depth
13 km below the surface
Felt
no reports yet
Nearest
San Diego County, 55 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3421 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 6.8 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 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 33.4728, -116.5172. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 55 km (34 mi) NNE of here earthquakes near San Diego County
Riverside County, CA 56 km (35 mi) WSW of here earthquakes near Riverside County
Imperial County, CA 118 km (73 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

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

  1. 2.2 7km NNE of Borrego Springs, CA
  2. 2.4 14km W of Salton City, CA
  3. 2.1 5km SW of Idyllwild, CA
  4. 2.1 14km W of Salton City, CA
  5. 2.2 12km N of Indio, CA
  6. 2.1 8km ENE of Borrego Springs, CA
  7. 2.4 7km SE of Julian, CA
  8. 2.0 12km N of Indio, CA
  9. 1.6 11km SW of Anza, CA
  10. 1.7 6km NNE of Borrego Springs, CA
  11. 1.8 18km N of Borrego Springs, CA
  12. 1.6 6km NE of Anza, CA
  13. 3.1 4km NE of Anza, CA
  14. 2.2 5km NE of Anza, CA
  15. 2.5 10km ENE of Aguanga, 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 270,000 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.