QuakeIndex

Earthquake · automatic estimate, may change

M 2.2md

11 km SE of Temelec, CA

· 13 km deep · released about 60 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Marin County 34 kmNapa County 35 kmSolano County 41 kmContra Costa County 50 kmSonoma County 58 kmYolo County 69 kmAlameda County 75 kmSan Francisco County 76 kmSan Mateo County 87 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 2.2 (md)
Depth
13 km below the surface
Felt
no reports yet
Nearest
Marin County, 34 km WSW
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 343 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 60 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 250,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 180,000× the energy of this one
  3. Around the size people start to feel M 3.0 16× the energy of this one
  4. This earthquake M 2.2 about 60 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 38.1998, -122.4038. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Marin County, CA 34 km (21 mi) ENE of here earthquakes near Marin County
Napa County, CA 35 km (22 mi) SSW of here earthquakes near Napa County
Solano County, CA 41 km (26 mi) W of here earthquakes near Solano County
Contra Costa County, CA 50 km (31 mi) NW of here earthquakes near Contra Costa County
Sonoma County, CA 58 km (36 mi) SE of here earthquakes near Sonoma County
Yolo County, CA 69 km (43 mi) SW of here earthquakes near Yolo County

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

Aftershocks so far

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

  1. 1.7 8 km NW of San Francisco Zoo, CA
  2. 1.6 3 km NNW of Crockett, CA
  3. 3.5 4 km SSW of Vallejo, CA
  4. 1.7 2 km ESE of Berkeley, CA
  5. 1.7 6 km ENE of Vallejo, CA
  6. 1.6 10 km ESE of Black Point-Green Point, CA
  7. 2.1 6 km SW of Kenwood, CA
  8. 2.6 2 km WNW of Concord, CA
  9. 1.6 8 km NNW of Lafayette, CA
  10. 2.0 8 km E of Suisun City, CA
  11. 1.6 7 km NNW of Lafayette, CA
  12. 1.5 7 km NNW of Lafayette, CA
  13. 2.4 7 km NNW of Lafayette, CA
  14. 2.9 7 km N of Orinda, CA
  15. 2.1 3 km ENE of Stinson Beach, 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 2,500 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.