QuakeIndex

Earthquake · reviewed by a seismologist

M 2.0md

5 km WSW of Martinez, California

· 9.0 km deep · released about 32 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 22 kmSolano County 38 kmAlameda County 45 kmMarin County 49 kmNapa County 59 kmSan Mateo County 66 kmSan Francisco County 80 kmYolo County 80 kmSan Joaquin County 81 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 2.0 (md)
Depth
9.0 km below the surface
Felt
3 reports · strongest reported intensity II
Nearest
Contra Costa County, 22 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3470 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 32 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.0 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 470,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 330,000× the energy of this one
  3. Around the size people start to feel M 3.0 30× the energy of this one
  4. This earthquake M 2.0 about 32 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 37.9922, -122.1885. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 22 km (14 mi) WNW of here earthquakes near Contra Costa County
Solano County, CA 38 km (23 mi) SW of here earthquakes near Solano County
Alameda County, CA 45 km (28 mi) NNW of here earthquakes near Alameda County
Marin County, CA 49 km (31 mi) E of here earthquakes near Marin County
Napa County, CA 59 km (36 mi) SSE of here earthquakes near Napa County
San Mateo County, CA 66 km (41 mi) NNE of here earthquakes near San Mateo County

Places and coordinates from the US Census Bureau Gazetteer (2024). Distances are from the epicentre.

Aftershocks so far

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

  1. 1.5 1 km ENE of Pacifica, California
  2. 1.6 1 km ENE of Pacifica, California
  3. 2.5 2 km S of Piedmont, California
  4. 1.7 4 km NW of Acalanes Ridge, California
  5. 1.7 4km NW of Castro Valley, CA
  6. 3.0 1 km WSW of Kensington, California
  7. 1.6 1 km E of North Gate, California
  8. 1.6 7 km WNW of Napa, California
  9. 1.8 1 km N of Pleasant Hill, California
  10. 2.3 1 km W of Danville, California
  11. 1.7 3 km SE of North Gate, California
  12. 1.5 1 km W of Concord, California
  13. 1.6 0 km N of Contra Costa Centre, California
  14. 2.3 1 km ENE of Pacheco, California
  15. 2.1 1 km N of Pleasant Hill, 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.