QuakeIndex

Earthquake · reviewed by a seismologist

M 2.9md

10km E of San Simeon, CA

· 8.4 km deep · released about 750 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 64 kmMonterey County 68 kmSan Benito County 106 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 2.9 (md)
Depth
8.4 km below the surface
Felt
4 reports · strongest reported intensity III
Nearest
San Luis Obispo County, 64 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3186 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 4 people have reported feeling it to USGS.

How big was it?

This earthquake released about 750 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 20,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 14,000× the energy of this one
  3. Around the size people start to feel M 3.0 1.3× the energy of this one
  4. This earthquake M 2.9 about 750 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 35.6603, -121.0758. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 64 km (40 mi) WNW of here earthquakes near San Luis Obispo County
Monterey County, CA 68 km (42 mi) SSE of here earthquakes near Monterey County
San Benito County, CA 106 km (66 mi) S of here earthquakes near San Benito County
Kings County, CA 122 km (76 mi) WSW of here earthquakes near Kings 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. 1.9 25km NNW of San Simeon, CA
  2. 2.3 14km SSW of San Simeon, CA
  3. 1.5 8km WNW of Templeton, CA
  4. 1.6 8km WNW of Templeton, CA
  5. 1.6 2km SE of San Ardo, CA
  6. 1.5 6km W of Templeton, CA
  7. 2.2 6km W of Templeton, CA
  8. 2.8 3km SE of San Ardo, CA
  9. 2.4 3km SE of San Ardo, CA
  10. 1.6 3km SE of San Ardo, CA
  11. 1.6 10km E of San Simeon, CA
  12. 1.5 3km SE of San Ardo, CA
  13. 1.6 24km SE of Lopez Point, CA
  14. 1.7 22km NW of San Simeon, CA
  15. 1.5 13km N of Cayucos, 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.