QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

13km WNW of Anza, CA

· 8.0 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 62 kmRiverside County 76 kmOrange County 90 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
8.0 km below the surface
Felt
no reports yet
Nearest
San Diego County, 62 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1638 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 5.7 970,000× the energy of this one
  3. Around the size people start to feel M 3.0 86× 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 33.5847, -116.8085. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 62 km (39 mi) N of here earthquakes near San Diego County
Riverside County, CA 76 km (47 mi) WSW of here earthquakes near Riverside County
Orange County, CA 90 km (56 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

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

  1. 2.4 23km ESE of Anza, CA
  2. 1.7 4km NNW of Lake Henshaw, CA
  3. 2.2 16km N of Borrego Springs, CA
  4. 2.7 17km ESE of Anza, CA
  5. 1.7 22km ESE of Anza, CA
  6. 1.6 7km WNW of Anza, CA
  7. 1.5 4km SSE of Beaumont, CA
  8. 3.5 2km SSE of Palomar Observatory, CA
  9. 2.6 19km ESE of Anza, CA
  10. 1.9 3km ESE of Valle Vista, CA
  11. 2.4 4km NNW of Lake Henshaw, CA
  12. 1.9 5km NW of Palomar Observatory, CA
  13. 2.6 10km SW of Morongo Valley, CA
  14. 1.7 7km SE of Valle Vista, CA
  15. 2.1 13km WNW 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 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.