QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

4 km S of Pittsburg, California

· 19 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 10 kmSolano County 31 kmAlameda County 38 kmSan Joaquin County 53 kmSacramento County 69 kmNapa County 70 kmMarin County 76 kmYolo County 77 kmSan Mateo County 77 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
19 km below the surface
Felt
no reports yet
Nearest
Contra Costa County, 10 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3471 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 9.6 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 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 37.9887, -121.8775. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 10 km (6 mi) NE of here earthquakes near Contra Costa County
Solano County, CA 31 km (20 mi) S of here earthquakes near Solano County
Alameda County, CA 38 km (24 mi) N of here earthquakes near Alameda County
San Joaquin County, CA 53 km (33 mi) W of here earthquakes near San Joaquin County
Sacramento County, CA 69 km (43 mi) SW of here earthquakes near Sacramento County
Napa County, CA 70 km (43 mi) SE of here earthquakes near Napa 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. 2.0 1 km W of Danville, California
  2. 1.5 2 km E of Berkeley, California
  3. 1.6 2 km SW of American Canyon, California
  4. 2.2 5 km S of Livermore, California
  5. 1.7 3 km W of Byron, California
  6. 1.6 4 km SSW of Byron, California
  7. 1.7 1 km ESE of Pacheco, California
  8. 1.7 2 km NE of San Ramon, California
  9. 1.8 4 km ENE of Clayton, California
  10. 1.6 4 km WNW of Orinda, California
  11. 1.6 4 km NNW of Union City, California
  12. 2.5 2 km S of Piedmont, California
  13. 1.7 4 km NW of Acalanes Ridge, California
  14. 1.7 4km NW of Castro Valley, CA
  15. 3.0 1 km WSW of Kensington, 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.