QuakeIndex

quarry blast · reviewed by a seismologist

M 1.6md

6km ESE of Santa Venetia, CA

· -0.0 km deep · released about 8.7 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marin County 26 kmContra Costa County 45 kmSolano County 56 kmSan Francisco County 58 kmNapa County 60 kmAlameda County 61 kmSan Mateo County 63 kmSonoma County 73 kmYolo County 92 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 1.6 (md)
Depth
-0.0 km below the surface
Felt
no reports yet
Nearest
Marin County, 26 km WNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2153 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

USGS catalogues this as quarry blast, not an earthquake.

How big was it?

This earthquake released about 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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 37.9813, -122.4603. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marin County, CA 26 km (16 mi) ESE of here earthquakes near Marin County
Contra Costa County, CA 45 km (28 mi) W of here earthquakes near Contra Costa County
Solano County, CA 56 km (35 mi) SW of here earthquakes near Solano County
San Francisco County, CA 58 km (36 mi) ENE of here earthquakes near San Francisco County
Napa County, CA 60 km (37 mi) SSW of here earthquakes near Napa County
Alameda County, CA 61 km (38 mi) NW of here earthquakes near Alameda County

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

Aftershocks so far

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

  1. 1.9 3km ESE of Berkeley, CA
  2. 1.6 3km WSW of Blackhawk, CA
  3. 1.6 2km N of San Ramon, CA
  4. 2.3 2km SE of Danville, CA
  5. 1.8 2km ESE of Berkeley, CA
  6. 2.2 3km SW of Green Valley, CA
  7. 2.0 0km SE of Pleasant Hill, CA
  8. 1.5 3km ESE of Berkeley, CA
  9. 2.6 3km ESE of Berkeley, CA
  10. 2.1 2km WNW of Castro Valley, CA
  11. 1.6 7km ENE of Rohnert Park, CA
  12. 2.0 7km ENE of Rohnert Park, CA
  13. 1.7 7km ENE of Rohnert Park, CA
  14. 2.5 7km ENE of Rohnert Park, CA
  15. 1.9 2km NW of Orinda, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.5 on 2019-10-15 — it released about 17,000 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.