QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

13km NW of Sea Ranch, CA

· 2.7 km deep · released about 6.8 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 63 kmMendocino County 70 kmLake County 77 kmMarin County 110 kmNapa County 111 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 1.6 (md)
Depth
2.7 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 63 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2868 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 6.8 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 2,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,600,000× the energy of this one
  3. Around the size people start to feel M 3.0 140× the energy of this one
  4. This earthquake M 1.6 about 6.8 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 38.8090, -123.5502. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 63 km (39 mi) WNW of here earthquakes near Sonoma County
Mendocino County, CA 70 km (43 mi) S of here earthquakes near Mendocino County
Lake County, CA 77 km (48 mi) WSW of here earthquakes near Lake County
Marin County, CA 110 km (68 mi) NW of here earthquakes near Marin County
Napa County, CA 111 km (69 mi) WNW of here earthquakes near Napa County
Colusa County, CA 121 km (75 mi) WSW of here earthquakes near Colusa County

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

Aftershocks so far

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

  1. 2.1 2km NNW of Talmage, CA
  2. 1.9 15km ESE of Navarro Head, CA
  3. 1.8 15km ESE of Navarro Head, CA
  4. 2.3 2km NNW of Talmage, CA
  5. 1.9 14km WSW of Lakeport, CA
  6. 3.1 15km ESE of Navarro Head, CA
  7. 1.6 18km NW of Cloverdale, CA
  8. 1.8 7km W of Fort Ross, CA
  9. 1.9 5km E of Boonville, CA
  10. 1.9 13km SW of Lakeport, CA
  11. 1.8 21km NE of Sea Ranch, CA
  12. 2.5 16km ESE of Navarro Head, CA
  13. 1.8 16km ESE of Navarro Head, CA
  14. 1.7 16km ESE of Navarro Head, CA
  15. 2.3 5km S 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.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.