QuakeIndex

Earthquake · reviewed by a seismologist

M 4.3mw

6 km NW of Parkfield, CA

· 9.5 km deep · released about 40 tons of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 61 kmKings County 62 kmMonterey County 82 kmSan Benito County 93 kmFresno County 118 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 4.3 (mw)
Depth
9.5 km below the surface
Felt
483 reports · strongest reported intensity IV
Measured shaking
intensity V (ShakeMap)
USGS impact alert
green
Tsunami
USGS flagged this event for tsunami evaluation. Follow tsunami.gov for official messages.
Nearest
San Luis Obispo County, 61 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 117 days ago

This was a light earthquake. It is usually felt clearly nearby and can rattle windows and dishes, but damage is uncommon. 483 people have reported feeling it to USGS.

How big was it?

This earthquake released about 40 tons of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 5.3 would have released about 32 times as much.

  1. Northridge, California 1994 M 6.7 4,300× the energy of this one
  2. Mineral, Virginia 2011 M 5.8 190× the energy of this one
  3. Magna, Utah 2020 M 5.7 130× the energy of this one
  4. This earthquake M 4.3 about 40 tons of TNT
  5. Around the size people start to feel M 3.0 this one released 83× 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 35.9345, -120.4840. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 61 km (38 mi) N of here earthquakes near San Luis Obispo County
Kings County, CA 62 km (39 mi) WSW of here earthquakes near Kings County
Monterey County, CA 82 km (51 mi) ESE of here earthquakes near Monterey County
San Benito County, CA 93 km (58 mi) SE of here earthquakes near San Benito County
Fresno County, CA 118 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

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

  1. 2.4 7 km NW of Kettleman City, CA
  2. 1.9 6 km NW of Kettleman City, CA
  3. 1.6 5 km ENE of Coalinga, CA
  4. 1.6 4 km ENE of Coalinga, CA
  5. 2.4 5 km ENE of Coalinga, CA
  6. 2.1 5 km ENE of Coalinga, CA
  7. 1.8 15 km NNW of Coalinga, CA
  8. 2.4 8 km NW of Kettleman City, CA
  9. 2.8 7 km NW of Parkfield, CA
  10. 1.9 6 km NNW of Cholame, CA
  11. 2.4 19 km NW of Parkfield, CA
  12. 2.2 15 km NNW of Coalinga, CA
  13. 1.6 8 km NW of Kettleman City, CA
  14. 1.5 16 km NW of Parkfield, CA
  15. 1.7 7 km NW of Parkfield, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.3 on 2019-12-17 — it released about 1 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.