QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7ml

11km NNE of Julian, CA

· 13 km deep · released about 10 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 27 kmRiverside County 81 kmImperial County 111 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
13 km below the surface
Felt
no reports yet
Nearest
San Diego County, 27 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1226 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 10 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 1,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 95× the energy of this one
  4. This earthquake M 1.7 about 10 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 33.1627, -116.5430. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 27 km (17 mi) NE of here earthquakes near San Diego County
Riverside County, CA 81 km (50 mi) SW of here earthquakes near Riverside County
Imperial County, CA 111 km (69 mi) W of here earthquakes near Imperial County
Orange County, CA 128 km (80 mi) ESE of here earthquakes near Orange County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 1 km S of Anza, CA
  2. 1.7 20 km ESE of Anza, CA
  3. 1.5 4km NW of Palomar Observatory, CA
  4. 1.9 6km W of Borrego Springs, CA
  5. 1.9 6km NE of Borrego Springs, CA
  6. 1.5 23km ESE of Anza, CA
  7. 1.7 10km NNE of Ocotillo Wells, CA
  8. 1.6 10km N of Borrego Springs, CA
  9. 1.8 8km NNE of Borrego Springs, CA
  10. 1.8 3km SSW of Anza, CA
  11. 2.5 5km NE of Anza, CA
  12. 1.6 26km SW of Ocotillo Wells, CA
  13. 1.5 20 km ESE of Julian, CA
  14. 2.0 5km SW of Palomar Observatory, CA
  15. 1.8 10km ENE of Pala, 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 180,000 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.