QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

4km SSE of Elmira, CA

· 22 km deep · released about 18 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 8 kmYolo County 40 kmNapa County 44 kmContra Costa County 45 kmSacramento County 49 kmSan Joaquin County 68 kmAlameda County 75 kmSutter County 81 kmMarin 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 1.9 (md)
Depth
22 km below the surface
Felt
no reports yet
Nearest
Solano County, 8 km SW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2424 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 18 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 5.8 840,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 600,000× the energy of this one
  3. Around the size people start to feel M 3.0 53× the energy of this one
  4. This earthquake M 1.9 about 18 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 38.3202, -121.8832. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 8 km (5 mi) NE of here earthquakes near Solano County
Yolo County, CA 40 km (25 mi) S of here earthquakes near Yolo County
Napa County, CA 44 km (27 mi) ESE of here earthquakes near Napa County
Contra Costa County, CA 45 km (28 mi) N of here earthquakes near Contra Costa County
Sacramento County, CA 49 km (31 mi) WSW of here earthquakes near Sacramento County
San Joaquin County, CA 68 km (43 mi) NW of here earthquakes near San Joaquin County

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

Aftershocks so far

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

  1. 2.9 9km S of Esparto, CA
  2. 1.7 6km W of Brentwood, CA
  3. 2.6 2km ENE of Pleasant Hill, CA
  4. 1.6 3km SW of Clayton, CA
  5. 2.2 3km ENE of Walnut Creek, CA
  6. 2.7 2km SSE of Crockett, CA
  7. 1.6 15km ENE of Yountville, CA
  8. 1.9 13km ENE of Yountville, CA
  9. 2.6 6km SW of Clayton, CA
  10. 2.5 6km NE of Alamo, CA
  11. 1.6 5km E of Vallejo, CA
  12. 2.5 6km W of Yountville, CA
  13. 1.9 6km NE of Alamo, CA
  14. 2.0 3km SW of American Canyon, CA
  15. 1.5 12km E of Yountville, 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 8,200 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.