QuakeIndex

Earthquake · reviewed by a seismologist

M 2.8md

5 km E of Boonville, CA

· 4.3 km deep · released about 450 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 48 kmLake County 50 kmSonoma County 63 kmColusa County 94 kmNapa County 102 kmGlenn County 102 kmMarin County 117 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 (md)
Depth
4.3 km below the surface
Felt
35 reports · strongest reported intensity IV
Nearest
Mendocino County, 48 km NNW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 939 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 35 people have reported feeling it to USGS.

How big was it?

This earthquake released about 450 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 34,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 24,000× the energy of this one
  3. Around the size people start to feel M 3.0 2.1× the energy of this one
  4. This earthquake M 2.8 about 450 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 39.0103, -123.3060. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 48 km (30 mi) SSE of here earthquakes near Mendocino County
Lake County, CA 50 km (31 mi) WSW of here earthquakes near Lake County
Sonoma County, CA 63 km (39 mi) NNW of here earthquakes near Sonoma County
Colusa County, CA 94 km (58 mi) W of here earthquakes near Colusa County
Napa County, CA 102 km (63 mi) WNW of here earthquakes near Napa County
Glenn County, CA 102 km (63 mi) SW of here earthquakes near Glenn County

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

Aftershocks so far

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

  1. 1.8 6 km NW of The Geysers, CA
  2. 2.9 6 km NW of The Geysers, CA
  3. 2.1 8 km WNW of Cobb, CA
  4. 1.7 6 km NW of The Geysers, CA
  5. 1.6 7 km NW of The Geysers, CA
  6. 1.6 10 km ESE of Willits, CA
  7. 1.8 8 km NW of The Geysers, CA
  8. 1.5 10 km WNW of The Geysers, CA
  9. 1.8 8 km WNW of Cobb, CA
  10. 1.7 8 km NW of The Geysers, CA
  11. 1.6 7 km WNW of Cobb, CA
  12. 1.8 7 km NW of The Geysers, CA
  13. 2.1 7 km NW of The Geysers, CA
  14. 1.6 12 km WSW of Lakeport, CA
  15. 1.6 8 km NW of The Geysers, 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 5.0 on 2016-12-14 — it released about 2,200 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.