QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

29km WSW of Lompoc, CA

· 0.7 km deep · released about 550 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Santa Barbara County 65 kmSan Luis Obispo County 99 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 2.8 (ml)
Depth
0.7 km below the surface
Felt
9 reports · strongest reported intensity III
Nearest
Santa Barbara County, 65 km E
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1513 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 9 people have reported feeling it to USGS.

How big was it?

This earthquake released about 550 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 28,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 19,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.7× the energy of this one
  4. This earthquake M 2.8 about 550 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 34.5350, -120.7467. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Santa Barbara County, CA 65 km (40 mi) W of here earthquakes near Santa Barbara County
San Luis Obispo County, CA 99 km (61 mi) SSW of here earthquakes near San Luis Obispo 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. 2.1 13km SSW of Lompoc, CA
  2. 2.0 13km SSW of Lompoc, CA
  3. 2.0 31 km SW of Lompoc, CA
  4. 2.6 13km SSW of Lompoc, CA
  5. 2.1 5km SSW of Orcutt, CA
  6. 2.6 52km WSW of Lompoc, CA
  7. 2.1 42km SW of Lompoc, CA
  8. 1.6 8km E of Vandenberg Village, CA
  9. 2.1 12km NNW of Vandenberg Air Force Base, CA
  10. 1.9 24km SW of Lompoc, CA
  11. 2.1 27km SW of Lompoc, CA
  12. 1.8 8km E of Vandenberg Village, CA
  13. 1.7 15km W of Guadalupe, CA
  14. 1.8 25km SW of Lompoc, CA
  15. 2.3 38km NW of San Miguel Is., 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.