QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6ml

22km ESE of Anza, CA

· 12 km deep · released about 7.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Riverside County 49 kmSan Diego County 60 kmImperial 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
12 km below the surface
Felt
no reports yet
Nearest
Riverside County, 49 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3757 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 7.6 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 2,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,400,000× the energy of this one
  3. Around the size people start to feel M 3.0 130× the energy of this one
  4. This earthquake M 1.6 about 7.6 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 33.4877, -116.4468. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Riverside County, CA 49 km (31 mi) WSW of here earthquakes near Riverside County
San Diego County, CA 60 km (37 mi) NNE of here earthquakes near San Diego County
Imperial County, CA 113 km (70 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

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

  1. 1.9 20km ESE of Anza, CA
  2. 1.9 14km WNW of Anza, CA
  3. 1.7 18km NNW of Borrego Springs, CA
  4. 1.8 22km ESE of Anza, CA
  5. 1.9 14km WNW of Anza, CA
  6. 1.9 22km ESE of Anza, CA
  7. 2.8 20km ESE of Anza, CA
  8. 2.0 20km ESE of Anza, CA
  9. 2.3 11km NNE of Borrego Springs, CA
  10. 1.8 9km NNW of Anza, CA
  11. 1.5 19km ESE of Anza, CA
  12. 2.0 6km WNW of Anza, CA
  13. 1.8 3km NE of Ocotillo Wells, CA
  14. 1.6 0km WSW of Lake Henshaw, CA
  15. 1.6 23km ESE 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 5.2 on 2016-06-10 — it released about 240,000 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.