QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

27km W of Guadalupe, CA

· 0.4 km deep · released about 25 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 64 kmSanta Barbara County 87 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 1.9 (md)
Depth
0.4 km below the surface
Felt
no reports yet
Nearest
San Luis Obispo County, 64 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2121 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 25 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 620,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 440,000× the energy of this one
  3. Around the size people start to feel M 3.0 39× the energy of this one
  4. This earthquake M 1.9 about 25 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 34.9267, -120.8678. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 64 km (40 mi) SW of here earthquakes near San Luis Obispo County
Santa Barbara County, CA 87 km (54 mi) WNW of here earthquakes near Santa Barbara County

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

Aftershocks so far

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

  1. 3.6 8 km SW of Lompoc, CA
  2. 2.4 10 km SW of Lompoc, CA
  3. 2.0 3 km E of Avila Beach, CA
  4. 3.2 10 km SW of Lompoc, CA
  5. 1.8 3 km S of Baywood-Los Osos, CA
  6. 1.8 15 km NE of Arroyo Grande, CA
  7. 1.7 8 km ESE of San Luis Obispo, CA
  8. 2.0 17 km W of Vandenberg Air Force Base, CA
  9. 1.6 22 km SW of Vandenberg Air Force Base, CA
  10. 1.5 4 km NW of San Luis Obispo, CA
  11. 2.8 5 km W of Baywood-Los Osos, CA
  12. 3.1 8 km NW of Avila Beach, CA
  13. 1.7 8 km NW of Avila Beach, CA
  14. 2.5 12 km WSW of Morro Bay, CA
  15. 1.8 10km W of Orcutt, 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.