QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

24km SE of Santa Margarita, CA

· 2.5 km deep · released about 120 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 14 kmSanta Barbara County 88 kmKings County 103 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 2.4 (md)
Depth
2.5 km below the surface
Felt
1 report · strongest reported intensity III
Nearest
San Luis Obispo County, 14 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2109 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 120 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 120,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 86,000× the energy of this one
  3. Around the size people start to feel M 3.0 7.7× the energy of this one
  4. This earthquake M 2.4 about 120 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 35.2698, -120.3898. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 14 km (9 mi) SSE of here earthquakes near San Luis Obispo County
Santa Barbara County, CA 88 km (54 mi) NNW of here earthquakes near Santa Barbara County
Kings County, CA 103 km (64 mi) SSW of here earthquakes near Kings County
Monterey County, CA 136 km (85 mi) SE of here earthquakes near Monterey County
Ventura County, CA 153 km (95 mi) NW of here earthquakes near Ventura County

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

Aftershocks so far

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

  1. 2.0 9km W of Templeton, CA
  2. 1.5 6km E of Atascadero, CA
  3. 1.7 6km E of Atascadero, CA
  4. 2.1 4km ESE of Orcutt, CA
  5. 1.8 5km W of Santa Margarita, CA
  6. 1.7 2km ENE of Cayucos, CA
  7. 1.6 3km SSE of Avila Beach, CA
  8. 2.8 16km W of Simmler, CA
  9. 1.6 5km WSW of Paso Robles, CA
  10. 1.7 4km WSW of Paso Robles, CA
  11. 1.9 7km W of Templeton, CA
  12. 1.6 2km SE of Cayucos, CA
  13. 1.6 10km SW of Templeton, CA
  14. 1.7 6km E of Atascadero, CA
  15. 1.5 6km E 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.