QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8ml

23km ENE of Pine Valley, CA

· 5.2 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Diego County 44 kmImperial County 90 kmRiverside County 93 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 1.8 (ml)
Depth
5.2 km below the surface
Felt
no reports yet
Nearest
San Diego County, 44 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2840 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 15 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 730,000× the energy of this one
  3. Around the size people start to feel M 3.0 65× the energy of this one
  4. This earthquake M 1.8 about 15 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 32.9318, -116.3153. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Diego County, CA 44 km (27 mi) ESE of here earthquakes near San Diego County
Imperial County, CA 90 km (56 mi) W of here earthquakes near Imperial County
Riverside County, CA 93 km (58 mi) SSW of here earthquakes near Riverside 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. 1.7 8km SE of Ocotillo Wells, CA
  2. 1.7 22km ESE of Julian, CA
  3. 1.9 19km ENE of Borrego Springs, CA
  4. 1.7 8km NNW of Borrego Springs, CA
  5. 1.6 26km ENE of Pine Valley, CA
  6. 1.6 9km NNW of Ocotillo Wells, CA
  7. 1.6 3km W of Borrego Springs, CA
  8. 1.7 16km NW of Ocotillo, CA
  9. 1.8 16km NW of Ocotillo, CA
  10. 1.8 15km NE of Borrego Springs, CA
  11. 2.0 16km ESE of Julian, CA
  12. 1.6 21km WSW of Westmorland, CA
  13. 1.8 8km ENE of Julian, CA
  14. 1.6 8km NNW of Borrego Springs, CA
  15. 1.5 8km NNW of Borrego Springs, 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.