QuakeIndex

Earthquake · reviewed by a seismologist

M 1.8md

4 km NW of Diablo Grande, California

· -0.0 km deep · released about 14 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Stanislaus County 32 kmSanta Clara County 40 kmSan Joaquin County 57 kmMerced County 58 kmAlameda County 58 kmSanta Cruz County 76 kmContra Costa County 79 kmSan Benito County 92 kmSan Mateo County 93 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
-0.0 km below the surface
Felt
no reports yet
Nearest
Stanislaus County, 32 km ENE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3476 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 14 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 1,100,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 790,000× the energy of this one
  3. Around the size people start to feel M 3.0 70× the energy of this one
  4. This earthquake M 1.8 about 14 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 37.4193, -121.3162. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Stanislaus County, CA 32 km (20 mi) WSW of here earthquakes near Stanislaus County
Santa Clara County, CA 40 km (25 mi) NE of here earthquakes near Santa Clara County
San Joaquin County, CA 57 km (36 mi) S of here earthquakes near San Joaquin County
Merced County, CA 58 km (36 mi) WNW of here earthquakes near Merced County
Alameda County, CA 58 km (36 mi) ESE of here earthquakes near Alameda County
Santa Cruz County, CA 76 km (47 mi) NE of here earthquakes near Santa Cruz 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. 1.7 18 km SW of Gustine, California
  2. 1.5 19 km SW of Gustine, California
  3. 1.6 Northern California
  4. 1.6 19 km SW of Gustine, California
  5. 1.9 10 km NE of Milpitas, California
  6. 2.5 4 km N of East Foothills, California
  7. 1.9 Northern California
  8. 2.3 6 km E of East Foothills, California
  9. 1.9 9 km NNE of East Foothills, California
  10. 2.6 9 km ENE of Morgan Hill, California
  11. 2.4 8 km NE of Milpitas, California
  12. 2.5 8 km ESE of East Foothills, California
  13. 1.5 14 km NE of Morgan Hill, California
  14. 2.8 8 km E of Gilroy, California
  15. 1.6 11 km SE of Sunol, 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.