QuakeIndex

Earthquake · reviewed by a seismologist

M 1.5md

4km E of San Luis Obispo, CA

· 6.6 km deep · released about 5.9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 19 kmSanta Barbara County 98 kmKings County 113 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 1.5 (md)
Depth
6.6 km below the surface
Felt
1 report · strongest reported intensity I
Nearest
San Luis Obispo County, 19 km NE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1467 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 1 person has reported feeling it to USGS.

How big was it?

This earthquake released about 5.9 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,500,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,800,000× the energy of this one
  3. Around the size people start to feel M 3.0 160× the energy of this one
  4. This earthquake M 1.5 about 5.9 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 35.2872, -120.6112. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 19 km (12 mi) SW of here earthquakes near San Luis Obispo County
Santa Barbara County, CA 98 km (61 mi) NNW of here earthquakes near Santa Barbara County
Kings County, CA 113 km (70 mi) SW of here earthquakes near Kings County
Monterey County, CA 124 km (77 mi) SSE of here earthquakes near Monterey County

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

Aftershocks so far

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

  1. 1.5 5 km SE of Atascadero, CA
  2. 1.6 10 km NE of Cayucos, CA
  3. 1.6 12 km NNE of Cayucos, CA
  4. 1.9 10 km W of Atascadero, CA
  5. 2.4 10 km W of Templeton, CA
  6. 1.9 24 km ESE of Santa Margarita, CA
  7. 1.8 10km W of Orcutt, CA
  8. 1.9 10 km W of Atascadero, CA
  9. 1.8 8km W of Templeton, CA
  10. 1.5 9km E of San Luis Obispo, CA
  11. 1.9 9km ENE of Cayucos, CA
  12. 1.5 4km WNW of Templeton, CA
  13. 1.6 9km SSE of Baywood-Los Osos, CA
  14. 1.8 10km ESE of Shandon, CA
  15. 1.7 10km WSW of Atascadero, 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.