QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

4 km WSW of Moskowite Corner, California

· 8.7 km deep · released about 21 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 12 kmSolano County 31 kmYolo County 40 kmMarin County 61 kmContra Costa County 61 kmSonoma County 62 kmSacramento County 77 kmSutter County 82 kmColusa County 84 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
8.7 km below the surface
Felt
no reports yet
Nearest
Napa County, 12 km NW
Nearest mapped fault
Green Valley fault, under 1 km from its surface trace — near is not the same as on
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3517 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 5.8 730,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 520,000× the energy of this one
  3. Around the size people start to feel M 3.0 46× 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 38.4245, -122.2313. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 12 km (8 mi) SE of here earthquakes near Napa County
Solano County, CA 31 km (19 mi) NW of here earthquakes near Solano County
Yolo County, CA 40 km (25 mi) SW of here earthquakes near Yolo County
Marin County, CA 61 km (38 mi) NE of here earthquakes near Marin County
Contra Costa County, CA 61 km (38 mi) NNW of here earthquakes near Contra Costa County
Sonoma County, CA 62 km (38 mi) E of here earthquakes near Sonoma County

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

Aftershocks so far

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

  1. 2.2 7 km NNW of Kenwood, California
  2. 1.8 9 km E of Angwin, California
  3. 2.4 3 km ENE of Vallejo, California
  4. 1.5 6 km E of Rohnert Park, California
  5. 1.7 3 km N of Larkfield-Wikiup, California
  6. 1.7 8 km E of Hidden Valley Lake, California
  7. 2.1 3 km SW of Moskowite Corner, California
  8. 2.4 5 km SSW of Monument Hills, California
  9. 3.0 2 km S of Monument Hills, California
  10. 2.7 6 km WSW of Moskowite Corner, California
  11. 2.9 2 km S of Monument Hills, California

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.

On USGS

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