QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8ml

6km WNW of Allendale, CA

· 19 km deep · released about 420 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Solano County 22 kmYolo County 27 kmNapa County 28 kmSacramento County 58 kmContra Costa County 60 kmSutter County 70 kmMarin County 78 kmSonoma County 80 kmColusa County 82 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 2.8 (ml)
Depth
19 km below the surface
Felt
79 reports · strongest reported intensity III
Nearest
Solano County, 22 km SSE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1300 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 79 people have reported feeling it to USGS.

How big was it?

This earthquake released about 420 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.8 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 36,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 26,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.3× the energy of this one
  4. This earthquake M 2.8 about 420 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 38.4573, -122.0150. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Solano County, CA 22 km (14 mi) NNW of here earthquakes near Solano County
Yolo County, CA 27 km (17 mi) SSW of here earthquakes near Yolo County
Napa County, CA 28 km (17 mi) ESE of here earthquakes near Napa County
Sacramento County, CA 58 km (36 mi) W of here earthquakes near Sacramento County
Contra Costa County, CA 60 km (37 mi) N of here earthquakes near Contra Costa County
Sutter County, CA 70 km (43 mi) SSW of here earthquakes near Sutter County

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

Aftershocks so far

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

  1. 1.9 12 km SE of Middletown, CA
  2. 1.6 14 km NNE of Angwin, CA
  3. 1.6 11 km ENE of Yountville, CA
  4. 1.6 12 km SE of Middletown, CA
  5. 1.6 12 km SE of Middletown, CA
  6. 1.8 12 km SE of Middletown, CA
  7. 2.4 12 km SE of Middletown, CA
  8. 1.6 15 km SE of Hidden Valley Lake, CA
  9. 1.5 12 km SE of Middletown, CA
  10. 2.3 12 km SE of Middletown, CA
  11. 1.5 12 km SE of Middletown, CA
  12. 1.6 12 km SE of Middletown, CA
  13. 1.8 11 km E of Yountville, CA
  14. 2.2 1 km NW of Green Valley, CA
  15. 1.6 7 km WNW 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 4.1 on 2022-06-02 — it released about 120 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.