QuakeIndex

Earthquake · reviewed by a seismologist

M 2.3md

23km NW of Parkfield, CA

· 9.9 km deep · released about 91 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Monterey County 67 kmKings County 71 kmSan Luis Obispo County 74 kmSan Benito County 76 kmFresno County 117 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 2.3 (md)
Depth
9.9 km below the surface
Felt
no reports yet
Nearest
Monterey County, 67 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3175 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 91 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.3 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 170,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 120,000× the energy of this one
  3. Around the size people start to feel M 3.0 10× the energy of this one
  4. This earthquake M 2.3 about 91 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 36.0433, -120.6078. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Monterey County, CA 67 km (42 mi) ESE of here earthquakes near Monterey County
Kings County, CA 71 km (44 mi) W of here earthquakes near Kings County
San Luis Obispo County, CA 74 km (46 mi) N of here earthquakes near San Luis Obispo County
San Benito County, CA 76 km (47 mi) SE of here earthquakes near San Benito County
Fresno County, CA 117 km (73 mi) SW of here earthquakes near Fresno County

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

Aftershocks so far

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

  1. 2.0 5km ENE of New Idria, CA
  2. 1.7 15km WSW of Cantua Creek, CA
  3. 1.8 6km SW of San Ardo, CA
  4. 1.9 24km NW of Parkfield, CA
  5. 1.7 7km S of Huron, CA
  6. 1.6 10km SW of Huron, CA
  7. 2.0 24km NW of Parkfield, CA
  8. 1.7 2km SSW of New Idria, CA
  9. 1.6 23km SE of Pinnacles, CA
  10. 2.6 17km NW of Parkfield, CA
  11. 1.6 24km NNE of San Ardo, CA
  12. 2.4 3km SSW of Huron, CA
  13. 2.1 24km NE of King City, CA
  14. 1.6 12km WSW of Huron, CA
  15. 1.7 12km WSW of Huron, 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.