QuakeIndex

Earthquake · automatic estimate, may change

M 1.9md

13 km NNW of Rio Vista, CA

· 6.4 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 15 kmContra Costa County 40 kmSacramento County 43 kmYolo County 49 kmSan Joaquin County 56 kmNapa County 56 kmAlameda County 69 kmSutter County 87 kmMarin County 88 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 1.9 (md)
Depth
6.4 km below the surface
Felt
no reports yet
Nearest
Solano County, 15 km W
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 399 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 21 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 710,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 500,000× the energy of this one
  3. Around the size people start to feel M 3.0 45× the energy of this one
  4. This earthquake M 1.9 about 21 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 38.2535, -121.7687. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 15 km (9 mi) E of here earthquakes near Solano County
Contra Costa County, CA 40 km (25 mi) NNE of here earthquakes near Contra Costa County
Sacramento County, CA 43 km (27 mi) WSW of here earthquakes near Sacramento County
Yolo County, CA 49 km (30 mi) SSE of here earthquakes near Yolo County
San Joaquin County, CA 56 km (35 mi) NW of here earthquakes near San Joaquin County
Napa County, CA 56 km (35 mi) ESE of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 1.7 6 km ENE of Vallejo, CA
  2. 1.7 4 km E of Brentwood, CA
  3. 2.6 2 km WNW of Concord, CA
  4. 1.6 8 km NNW of Lafayette, CA
  5. 2.0 8 km E of Suisun City, CA
  6. 1.6 7 km NNW of Lafayette, CA
  7. 1.5 7 km NNW of Lafayette, CA
  8. 2.4 7 km NNW of Lafayette, CA
  9. 2.9 7 km N of Orinda, CA
  10. 2.5 7 km NNW of Lafayette, CA
  11. 2.8 8 km NNW of Lafayette, CA
  12. 2.3 7 km NNW of Lafayette, CA
  13. 2.1 8 km ENE of Vallejo, CA
  14. 2.1 1 km SW of Vallejo, CA
  15. 2.1 4 km S of Green Valley, 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 6,900 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.