QuakeIndex

Earthquake · reviewed by a seismologist

M 2.7md

1 km NNE of Boonville, California

· 5.5 km deep · released about 320 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 46 kmLake County 54 kmSonoma County 67 kmColusa County 98 kmGlenn County 104 kmNapa County 106 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 2.7 (md)
Depth
5.5 km below the surface
Felt
17 reports · strongest reported intensity III
Nearest
Mendocino County, 46 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3005 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 17 people have reported feeling it to USGS.

How big was it?

This earthquake released about 320 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 48,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 34,000× the energy of this one
  3. Around the size people start to feel M 3.0 3× the energy of this one
  4. This earthquake M 2.7 about 320 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 39.0257, -123.3583. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 46 km (28 mi) S of here earthquakes near Mendocino County
Lake County, CA 54 km (33 mi) W of here earthquakes near Lake County
Sonoma County, CA 67 km (42 mi) NW of here earthquakes near Sonoma County
Colusa County, CA 98 km (61 mi) W of here earthquakes near Colusa County
Glenn County, CA 104 km (65 mi) SW of here earthquakes near Glenn County
Napa County, CA 106 km (66 mi) WNW of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 2.2 12 km NE of Talmage, California
  2. 1.7 4 km ESE of Talmage, California
  3. 1.6 near the coast of Northern California
  4. 1.7 11 km W of Cobb, California
  5. 2.5 3 km SSE of Potter Valley, California
  6. 2.1 3 km NW of Redwood Valley, California
  7. 1.7 11 km W of Cobb, California
  8. 1.8 11 km W of Cobb, California
  9. 1.6 near the coast of Northern California
  10. 1.6 9 km WNW of Cobb, California
  11. 1.6 4 km NNE of Ukiah, California
  12. 1.5 9 km NE of Cloverdale, California
  13. 1.6 9 km WNW of Cobb, California
  14. 1.6 12 km N of Cazadero, California
  15. 1.7 11 km WNW of Cobb, 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.