QuakeIndex

Earthquake · reviewed by a seismologist

M 2.2md

12km E of Navarro Head, CA

· 3.6 km deep · released about 54 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 31 kmLake County 76 kmSonoma County 95 kmGlenn County 115 kmColusa County 120 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 2.2 (md)
Depth
3.6 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 31 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1930 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 54 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.2 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 280,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 200,000× the energy of this one
  3. Around the size people start to feel M 3.0 18× the energy of this one
  4. This earthquake M 2.2 about 54 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 39.1873, -123.6263. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 31 km (20 mi) SSW of here earthquakes near Mendocino County
Lake County, CA 76 km (48 mi) W of here earthquakes near Lake County
Sonoma County, CA 95 km (59 mi) NW of here earthquakes near Sonoma County
Glenn County, CA 115 km (71 mi) WSW of here earthquakes near Glenn County
Colusa County, CA 120 km (74 mi) W of here earthquakes near Colusa County
Napa County, CA 136 km (84 mi) NW of here earthquakes near Napa County

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

Aftershocks so far

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

  1. 1.6 12km WNW of Redwood Valley, CA
  2. 1.7 4km ENE of Boonville, CA
  3. 1.9 5km ENE of Boonville, CA
  4. 1.8 8km NNW of Redwood Valley, CA
  5. 1.9 10km NE of Navarro Head, CA
  6. 2.1 12km SE of Talmage, CA
  7. 1.6 6km NE of Willits, CA
  8. 1.7 13km SSE of Point Arena, CA
  9. 1.7 3km ENE of Talmage, CA
  10. 1.7 10km NNW of Redwood Valley, CA
  11. 2.0 12km ESE of Boonville, CA
  12. 1.6 6km NW of Boonville, CA
  13. 1.6 14km NNE of Brooktrails, CA
  14. 1.5 10km W of Redwood Valley, CA
  15. 1.7 12km SE of Point Arena, 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 4.3 on 2019-04-29 — it released about 1,700 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.