QuakeIndex

quarry blast · reviewed by a seismologist

M 1.5md

11km WSW of Lake Nacimiento, CA

· -0.3 km deep · released about 6.2 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 58 kmMonterey County 69 kmSan Benito County 104 kmKings County 114 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
-0.3 km below the surface
Felt
no reports yet
Nearest
San Luis Obispo County, 58 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3180 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 6.2 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 1,700,000× the energy of this one
  3. Around the size people start to feel M 3.0 150× the energy of this one
  4. This earthquake M 1.5 about 6.2 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 35.6830, -120.9833. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 58 km (36 mi) NW of here earthquakes near San Luis Obispo County
Monterey County, CA 69 km (43 mi) SSE of here earthquakes near Monterey County
San Benito County, CA 104 km (64 mi) S of here earthquakes near San Benito County
Kings County, CA 114 km (71 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

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

  1. 1.9 3km SE of San Ardo, CA
  2. 1.8 7km NE of San Simeon, CA
  3. 1.8 3km SE of San Ardo, CA
  4. 1.8 8km W of Atascadero, CA
  5. 1.9 3km SE of San Ardo, CA
  6. 1.9 25km NNW of San Simeon, CA
  7. 2.3 14km SSW of San Simeon, CA
  8. 1.5 8km WNW of Templeton, CA
  9. 1.6 8km WNW of Templeton, CA
  10. 1.6 2km SE of San Ardo, CA
  11. 1.5 6km W of Templeton, CA
  12. 2.2 6km W of Templeton, CA
  13. 2.8 3km SE of San Ardo, CA
  14. 2.4 3km SE of San Ardo, CA
  15. 1.6 3km SE of San Ardo, 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.