QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

11km NE of Bradley, CA

· 11 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 64 kmMonterey County 65 kmKings County 81 kmSan Benito County 84 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
11 km below the surface
Felt
no reports yet
Nearest
San Luis Obispo County, 64 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1482 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 35.9247, -120.7022. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
San Luis Obispo County, CA 64 km (40 mi) NNW of here earthquakes near San Luis Obispo County
Monterey County, CA 65 km (41 mi) ESE of here earthquakes near Monterey County
Kings County, CA 81 km (51 mi) WSW of here earthquakes near Kings County
San Benito County, CA 84 km (52 mi) SSE of here earthquakes near San Benito County
Fresno County, CA 132 km (82 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

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

  1. 1.6 23km ENE of San Lucas, CA
  2. 1.9 9km W of Templeton, CA
  3. 1.6 16km N of Coalinga, CA
  4. 1.9 18km SE of New Idria, CA
  5. 1.5 6km W of Avenal, CA
  6. 1.6 11km WSW of Templeton, CA
  7. 1.6 10km W of San Ardo, CA
  8. 1.9 16km NW of Parkfield, CA
  9. 1.6 16km N of Cayucos, CA
  10. 2.4 10km NW of Avenal, CA
  11. 2.6 20km NE of San Lucas, CA
  12. 1.6 8km NNE of San Simeon, CA
  13. 1.6 2km SSE of Parkfield, CA
  14. 1.6 8km NNE of San Simeon, CA
  15. 2.1 9km NNW of Avenal, 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 5,400 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.