QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

3km SSE of San Ardo, CA

· 10 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monterey County 47 kmSan Benito County 71 kmSan Luis Obispo County 78 kmKings County 97 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
10 km below the surface
Felt
no reports yet
Nearest
Monterey County, 47 km NW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3162 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 35.9927, -120.8917. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Monterey County, CA 47 km (29 mi) SE of here earthquakes near Monterey County
San Benito County, CA 71 km (44 mi) SSE of here earthquakes near San Benito County
San Luis Obispo County, CA 78 km (49 mi) NNW of here earthquakes near San Luis Obispo County
Kings County, CA 97 km (60 mi) W of here earthquakes near Kings County
Fresno County, CA 140 km (87 mi) SW of here earthquakes near Fresno County
Santa Cruz County, CA 151 km (94 mi) SE of here earthquakes near Santa Cruz County

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

Aftershocks so far

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

  1. 1.9 3km SE of San Ardo, CA
  2. 2.4 23km SE of Pinnacles, CA
  3. 1.9 22km NNE of San Lucas, CA
  4. 1.9 25km NNW of San Simeon, CA
  5. 1.8 19km SE of Pinnacles, CA
  6. 1.5 8km WNW of Templeton, CA
  7. 1.6 8km WNW of Templeton, CA
  8. 2.3 19km SE of Pinnacles, CA
  9. 1.6 16km NW of Parkfield, CA
  10. 2.0 10km NW of Parkfield, CA
  11. 1.6 2km SE of San Ardo, CA
  12. 2.8 3km SE of San Ardo, CA
  13. 1.6 20km SE of Pinnacles, CA
  14. 2.4 3km SE of San Ardo, CA
  15. 3.0 19km SE of Pinnacles, 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.