QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

3 km W of Byron, California

· 14 km deep · released about 9.3 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 25 kmAlameda County 32 kmSan Joaquin County 36 kmSolano County 50 kmStanislaus County 68 kmSacramento County 71 kmSanta Clara County 72 kmSan Mateo County 80 kmNapa County 91 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 1.7 (md)
Depth
14 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 25 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3351 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 9.3 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 100× the energy of this one
  4. This earthquake M 1.7 about 9.3 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 37.8705, -121.6748. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 25 km (15 mi) ESE of here earthquakes near Contra Costa County
Alameda County, CA 32 km (20 mi) NE of here earthquakes near Alameda County
San Joaquin County, CA 36 km (22 mi) WSW of here earthquakes near San Joaquin County
Solano County, CA 50 km (31 mi) SSE of here earthquakes near Solano County
Stanislaus County, CA 68 km (42 mi) WNW of here earthquakes near Stanislaus County
Sacramento County, CA 71 km (44 mi) SSW of here earthquakes near Sacramento 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. 1.7 5km NNE of San Leandro, CA
  2. 2.4 1km E of Pacheco, CA
  3. 2.1 3 km SSE of Rio Vista, California
  4. 2.0 10 km ENE of Milpitas, California
  5. 1.6 2 km NNW of Pleasant Hill, California
  6. 2.7 6km SE of Rio Vista, CA
  7. 2.0 3km E of Rio Vista, CA
  8. 2.3 1 km E of Pacheco, California
  9. 2.3 2 km SSE of Dublin, California
  10. 2.6 15 km SSE of Livermore, California
  11. 2.9 15 km SSE of Livermore, California
  12. 2.3 15 km SSE of Livermore, California
  13. 1.7 11 km SSE of Livermore, California
  14. 1.6 2 km W of Danville, California
  15. 2.0 2 km WSW of Clyde, California

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.