QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

14 km N of Point Arena, CA

· 4.2 km deep · released about 11 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 49 kmLake County 83 kmSonoma County 88 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
4.2 km below the surface
Felt
no reports yet
Nearest
Mendocino County, 49 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 524 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 11 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 1,300,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 930,000× the energy of this one
  3. Around the size people start to feel M 3.0 83× the energy of this one
  4. This earthquake M 1.7 about 11 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 39.0360, -123.6985. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 49 km (31 mi) SSW of here earthquakes near Mendocino County
Lake County, CA 83 km (51 mi) W of here earthquakes near Lake County
Sonoma County, CA 88 km (55 mi) NW of here earthquakes near Sonoma County
Glenn County, CA 128 km (80 mi) WSW of here earthquakes near Glenn County
Napa County, CA 133 km (82 mi) WNW of here earthquakes near Napa County
Marin County, CA 137 km (85 mi) NW of here earthquakes near Marin County

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

Aftershocks so far

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

  1. 1.6 16 km ESE of Navarro Head, CA
  2. 1.8 20 km SSW of Willits, CA
  3. 1.7 2 km SSE of Navarro Head, CA
  4. 1.6 20 km SSW of Willits, CA
  5. 1.5 2 km SSW of Redwood Valley, CA
  6. 1.5 16 km ESE of Boonville, CA
  7. 1.8 14 km NNE of Point Arena, CA
  8. 1.8 2 km SSE of Navarro Head, CA
  9. 1.6 11 km ESE of Boonville, CA
  10. 2.1 17 km E of Fort Bragg, CA
  11. 1.8 14 km S of Willits, CA
  12. 1.7 3 km NW of Redwood Valley, CA
  13. 1.8 1 km NW of Redwood Valley, CA
  14. 1.5 9 km SSE of Willits, CA
  15. 1.8 22 km E of Navarro Head, 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.