QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

13km NW of Parkfield, CA

· 5.3 km deep · released about 15 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N San Luis Obispo County 65 kmKings County 66 kmMonterey County 76 kmSan Benito County 86 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 1.8 (md)
Depth
5.3 km below the surface
Felt
no reports yet
Nearest
San Luis Obispo County, 65 km S
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2746 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 15 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 1,000,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 710,000× the energy of this one
  3. Around the size people start to feel M 3.0 63× the energy of this one
  4. This earthquake M 1.8 about 15 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 35.9717, -120.5385. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 65 km (41 mi) N of here earthquakes near San Luis Obispo County
Kings County, CA 66 km (41 mi) W of here earthquakes near Kings County
Monterey County, CA 76 km (47 mi) ESE of here earthquakes near Monterey County
San Benito County, CA 86 km (54 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

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

  1. 2.0 4km W of San Ardo, CA
  2. 3.0 5km NW of Parkfield, CA
  3. 1.6 10km NW of Parkfield, CA
  4. 1.6 18km NW of Parkfield, CA
  5. 2.1 11km NW of Parkfield, CA
  6. 3.5 4km SSE of Parkfield, CA
  7. 1.7 10km SSE of Huron, CA
  8. 1.6 10km NNW of Cholame, CA
  9. 2.2 2km NE of Cholame, CA
  10. 1.8 22km ENE of San Ardo, CA
  11. 1.6 7km E of Coalinga, CA
  12. 1.9 7km NW of Parkfield, CA
  13. 1.5 10km SW of Huron, CA
  14. 1.8 16km SW of New Idria, CA
  15. 1.7 11km 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.0 on 2018-11-27 — it released about 2,000 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.