QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

20 km ESE of Anza, CA

· 9.6 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 54 kmSan Diego County 55 kmImperial County 116 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 1.7 (ml)
Depth
9.6 km below the surface
Felt
no reports yet
Nearest
Riverside County, 54 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 658 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 11 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,400,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,000,000× the energy of this one
  3. Around the size people start to feel M 3.0 89× the energy of this one
  4. This earthquake M 1.7 about 11 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 33.4625, -116.4953. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 54 km (34 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 55 km (34 mi) NNE of here earthquakes near San Diego County
Imperial County, CA 116 km (72 mi) WNW of here earthquakes near Imperial County
Orange County, CA 121 km (75 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

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

  1. 1.6 3 km SE of Borrego Springs, CA
  2. 1.8 4 km WSW of Anza, CA
  3. 1.6 20 km SW of Ocotillo Wells, CA
  4. 2.8 8 km E of Borrego Springs, CA
  5. 1.8 22 km ESE of Julian, CA
  6. 2.0 22 km ESE of Anza, CA
  7. 1.6 9 km NE of Thousand Palms, CA
  8. 2.1 16 km ENE of Borrego Springs, CA
  9. 2.0 16 km NNW of Borrego Springs, CA
  10. 2.0 16 km NNW of Borrego Springs, CA
  11. 1.7 16 km NNW of Borrego Springs, CA
  12. 1.8 8 km SE of Valle Vista, CA
  13. 2.7 14 km N of Borrego Springs, CA
  14. 1.8 2 km ESE of Lake Henshaw, CA
  15. 2.0 7 km SE of Valle Vista, 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 170,000 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.