QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

13km SSE of Point Arena, CA

· 1.2 km deep · released about 9.6 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 68 kmMendocino County 71 kmLake County 82 kmMarin County 113 kmNapa County 117 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 1.7 (md)
Depth
1.2 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 68 km ESE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 1816 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 9.6 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,600,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,100,000× the energy of this one
  3. Around the size people start to feel M 3.0 99× the energy of this one
  4. This earthquake M 1.7 about 9.6 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 38.8092, -123.6172. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 68 km (42 mi) WNW of here earthquakes near Sonoma County
Mendocino County, CA 71 km (44 mi) SSW of here earthquakes near Mendocino County
Lake County, CA 82 km (51 mi) WSW of here earthquakes near Lake County
Marin County, CA 113 km (70 mi) NW of here earthquakes near Marin County
Napa County, CA 117 km (73 mi) WNW of here earthquakes near Napa County
Colusa County, CA 126 km (78 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

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

  1. 2.4 7km NW of Boonville, CA
  2. 2.0 16km WSW of Lakeport, CA
  3. 1.6 9km SE of Point Arena, CA
  4. 1.6 20km SW of Point Arena, CA
  5. 1.8 9km ENE of Boonville, CA
  6. 1.7 17km NNW of Cloverdale, CA
  7. 1.6 19km ESE of Boonville, CA
  8. 1.6 12km NNE of Point Arena, CA
  9. 1.8 32km WNW of Point Arena, CA
  10. 1.7 16km WNW of Boonville, CA
  11. 1.6 21km WNW of Ukiah, CA
  12. 1.6 12km W of Ukiah, CA
  13. 2.0 21km WNW of Ukiah, CA
  14. 1.6 15km NNW of Cloverdale, CA
  15. 1.6 16km NNW of Cloverdale, 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.