QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

1 km ESE of Pacheco, California

· 16 km deep · released about 360 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Contra Costa County 12 kmSolano County 34 kmAlameda County 39 kmMarin County 61 kmNapa County 63 kmSan Mateo County 69 kmSan Joaquin County 69 kmYolo County 79 kmSacramento County 82 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 2.7 (md)
Depth
16 km below the surface
Felt
18 reports · strongest reported intensity III
Nearest
Contra Costa County, 12 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3415 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 18 people have reported feeling it to USGS.

How big was it?

This earthquake released about 360 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 42,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 30,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.6× the energy of this one
  4. This earthquake M 2.7 about 360 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 37.9803, -122.0613. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Contra Costa County, CA 12 km (7 mi) NW of here earthquakes near Contra Costa County
Solano County, CA 34 km (21 mi) SSW of here earthquakes near Solano County
Alameda County, CA 39 km (24 mi) NNW of here earthquakes near Alameda County
Marin County, CA 61 km (38 mi) E of here earthquakes near Marin County
Napa County, CA 63 km (39 mi) SSE of here earthquakes near Napa County
San Mateo County, CA 69 km (43 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

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

  1. 1.6 0 km ENE of North Gate, California
  2. 2.5 1 km N of Pleasant Hill, California
  3. 1.8 1 km NNW of Pleasant Hill, California
  4. 1.7 4 km NNW of Orinda, California
  5. 2.6 2 km ESE of Berkeley, California
  6. 1.9 4 km NNW of Orinda, California
  7. 1.5 Northern California
  8. 1.6 4 km SE of Piedmont, California
  9. 1.5 9 km ESE of Black Point-Green Point, California
  10. 1.9 0 km NNW of Pleasant Hill, California
  11. 1.8 7 km ENE of Napa, California
  12. 2.0 0 km W of Kensington, California
  13. 1.7 0 km W of Kensington, California
  14. 1.8 0 km E of Hayward, California
  15. 2.0 4 km NNW of Orinda, 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.