QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

7km ENE of San Simeon, CA

· 5.5 km deep · released about 16 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monterey County 65 kmSan Luis Obispo County 69 kmSan Benito County 104 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 1.8 (md)
Depth
5.5 km below the surface
Felt
no reports yet
Nearest
Monterey County, 65 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2872 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 16 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 970,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 680,000× the energy of this one
  3. Around the size people start to feel M 3.0 61× the energy of this one
  4. This earthquake M 1.8 about 16 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 35.6758, -121.1257. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Monterey County, CA 65 km (40 mi) SSE of here earthquakes near Monterey County
San Luis Obispo County, CA 69 km (43 mi) WNW of here earthquakes near San Luis Obispo County
San Benito County, CA 104 km (65 mi) S of here earthquakes near San Benito County
Kings County, CA 126 km (78 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

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

  1. 1.6 13km WNW of San Simeon, CA
  2. 2.3 13km NW of San Simeon, CA
  3. 1.7 9km SSW of Atascadero, CA
  4. 1.5 10km NE of San Simeon, CA
  5. 2.0 20km WNW of Lake Nacimiento, CA
  6. 1.9 9km SW of San Ardo, CA
  7. 1.6 19km SSE of Lopez Point, CA
  8. 1.5 14km ENE of San Simeon, CA
  9. 1.7 26km NW of San Simeon, CA
  10. 1.9 20km NW of San Simeon, CA
  11. 2.5 20km NW of San Simeon, CA
  12. 1.9 29km WSW of San Simeon, CA
  13. 1.9 9km SW of San Ardo, CA
  14. 1.8 22km NW of San Simeon, CA
  15. 1.8 6km SW 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.