QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

10km SSE of Elmira, CA

· 23 km deep · released about 20 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 7 kmContra Costa County 40 kmYolo County 45 kmNapa County 48 kmSacramento County 49 kmSan Joaquin County 64 kmAlameda County 70 kmMarin County 81 kmSutter County 86 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
23 km below the surface
Felt
no reports yet
Nearest
Solano County, 7 km W
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1982 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 20 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 5.8 760,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 540,000× the energy of this one
  3. Around the size people start to feel M 3.0 48× the energy of this one
  4. This earthquake M 1.9 about 20 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 38.2720, -121.8610. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 7 km (4 mi) E of here earthquakes near Solano County
Contra Costa County, CA 40 km (25 mi) NNE of here earthquakes near Contra Costa County
Yolo County, CA 45 km (28 mi) S of here earthquakes near Yolo County
Napa County, CA 48 km (30 mi) ESE of here earthquakes near Napa County
Sacramento County, CA 49 km (31 mi) WSW of here earthquakes near Sacramento County
San Joaquin County, CA 64 km (40 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

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

  1. 1.8 5km ENE of Vallejo, CA
  2. 1.9 3km SW of Clayton, CA
  3. 1.6 11km NE of Napa, CA
  4. 2.5 12km ESE of Angwin, CA
  5. 1.5 13km E of Angwin, CA
  6. 1.8 1km ENE of Alamo, CA
  7. 2.4 13km NE of Yountville, CA
  8. 1.8 10km NE of Napa, CA
  9. 2.0 1km NNW of Pleasant Hill, CA
  10. 2.2 4km NNE of Blackhawk, CA
  11. 2.5 4km NNE of Blackhawk, CA
  12. 2.0 4km NE of Blackhawk, CA
  13. 2.3 2km WNW of Concord, CA
  14. 1.6 11km ENE of Yountville, CA
  15. 1.7 3km NNW of Byron, 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 7,400 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.