QuakeIndex

Earthquake · reviewed by a seismologist

M 2.1md

12km S of Boonville, CA

· 3.1 km deep · released about 51 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 57 kmLake County 59 kmMendocino County 59 kmNapa County 101 kmColusa County 103 kmMarin County 109 kmGlenn County 114 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 2.1 (md)
Depth
3.1 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 57 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2364 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 51 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.1 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 210,000× the energy of this one
  3. Around the size people start to feel M 3.0 19× the energy of this one
  4. This earthquake M 2.1 about 51 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 38.9043, -123.3715. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 57 km (36 mi) NW of here earthquakes near Sonoma County
Lake County, CA 59 km (36 mi) WSW of here earthquakes near Lake County
Mendocino County, CA 59 km (37 mi) S of here earthquakes near Mendocino County
Napa County, CA 101 km (63 mi) WNW of here earthquakes near Napa County
Colusa County, CA 103 km (64 mi) WSW of here earthquakes near Colusa County
Marin County, CA 109 km (68 mi) NNW of here earthquakes near Marin County

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

Aftershocks so far

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

  1. 1.9 15km WSW of Lakeport, CA
  2. 1.8 12km SE of Talmage, CA
  3. 1.7 9km NNW of Redwood Valley, CA
  4. 2.3 8km NNW of Redwood Valley, CA
  5. 1.5 9km NNW of Healdsburg, CA
  6. 1.8 12km WNW of Redwood Valley, CA
  7. 2.6 6km ESE of Redwood Valley, CA
  8. 1.8 20km SW of Willits, CA
  9. 2.2 20km SW of Willits, CA
  10. 2.3 13km W of Lakeport, CA
  11. 1.9 7km NW of The Geysers, CA
  12. 2.1 15km SW of Lakeport, CA
  13. 1.6 7km NW of The Geysers, CA
  14. 1.6 9km WNW of The Geysers, CA
  15. 1.7 12km NE of Talmage, 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 19,000 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.