QuakeIndex

Earthquake · reviewed by a seismologist

M 1.6md

5 km E of Point Arena, California

· 4.7 km deep · released about 9 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 60 kmSonoma County 75 kmLake County 80 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
4.7 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 60 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3266 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 9 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 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 9 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 38.9097, -123.6323. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 60 km (38 mi) SSW of here earthquakes near Mendocino County
Sonoma County, CA 75 km (46 mi) NW of here earthquakes near Sonoma County
Lake County, CA 80 km (50 mi) WSW of here earthquakes near Lake County
Napa County, CA 122 km (76 mi) WNW of here earthquakes near Napa County
Marin County, CA 123 km (76 mi) NW of here earthquakes near Marin County
Glenn County, CA 131 km (81 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

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

  1. 2.0 15km SE of Boonville, CA
  2. 1.6 13km NW of Sea Ranch, CA
  3. 1.7 20km WSW of Cloverdale, CA
  4. 1.5 14km SSE of Talmage, CA
  5. 2.2 4km SW of Talmage, CA
  6. 2.0 12km NW of Boonville, CA
  7. 2.2 20km WNW of Boonville, CA
  8. 1.8 7km W of Redwood Valley, CA
  9. 1.8 18km ESE of Boonville, CA
  10. 1.7 19km NNW of Cloverdale, CA
  11. 1.6 15km SE of Boonville, CA
  12. 2.4 16km SE of Boonville, CA
  13. 2.4 16km SE of Boonville, CA
  14. 1.8 5km E of Boonville, CA
  15. 1.7 15km SE of Boonville, 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.