QuakeIndex

Earthquake · reviewed by a seismologist

M 3.5mw

1km W of Parkfield, CA

· 6.6 km deep · released about 2.6 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 57 kmKings County 60 kmMonterey County 87 kmSan Benito County 98 kmFresno County 119 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 3.5 (mw)
Depth
6.6 km below the surface
Felt
11 reports · strongest reported intensity III
Measured shaking
intensity III (ShakeMap)
Nearest
San Luis Obispo County, 57 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2892 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 2.6 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 4.5 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 65,000× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 2,900× the energy of this one
  3. Magna, Utah 2020 M 5.7 2,100× the energy of this one
  4. This earthquake M 3.5 about 2.6 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 5.4× more

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 35.8982, -120.4458. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 57 km (35 mi) N of here earthquakes near San Luis Obispo County
Kings County, CA 60 km (37 mi) WSW of here earthquakes near Kings County
Monterey County, CA 87 km (54 mi) ESE of here earthquakes near Monterey County
San Benito County, CA 98 km (61 mi) SE of here earthquakes near San Benito County
Fresno County, CA 119 km (74 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

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

  1. 1.7 4km SSW of Huron, CA
  2. 1.9 18km NW of Parkfield, CA
  3. 1.6 9km NE of Coalinga, CA
  4. 1.6 2km NE of Avenal, CA
  5. 1.5 2km WSW of Avenal, CA
  6. 2.3 1km ESE of Avenal, CA
  7. 1.7 3km NE of Avenal, CA
  8. 1.9 23km NW of Parkfield, CA
  9. 2.0 8km S of Kettleman City, CA
  10. 3.0 24km ENE of San Ardo, CA
  11. 3.3 24km ENE of San Ardo, CA
  12. 1.7 8km ENE of Coalinga, CA
  13. 2.0 25km NW of Parkfield, CA
  14. 1.6 18km NW of Coalinga, CA
  15. 1.5 23km S of Kettleman City, 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.