QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

12km SE of Point Arena, CA

· 4.3 km deep · released about 100 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 67 kmSonoma County 68 kmLake County 79 kmMarin County 115 kmNapa County 116 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 2.4 (md)
Depth
4.3 km below the surface
Felt
11 reports · strongest reported intensity IV
Nearest
Mendocino County, 67 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2391 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 11 people have reported feeling it to USGS.

How big was it?

This earthquake released about 100 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.4 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 150,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 110,000× the energy of this one
  3. Around the size people start to feel M 3.0 9.4× the energy of this one
  4. This earthquake M 2.4 about 100 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 38.8393, -123.5932. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 67 km (42 mi) S of here earthquakes near Mendocino County
Sonoma County, CA 68 km (42 mi) WNW of here earthquakes near Sonoma County
Lake County, CA 79 km (49 mi) WSW of here earthquakes near Lake County
Marin County, CA 115 km (71 mi) NW of here earthquakes near Marin County
Napa County, CA 116 km (72 mi) WNW of here earthquakes near Napa County
Colusa County, CA 123 km (76 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. 2.9 16km W of Ukiah, CA
  2. 2.3 7km SSE of Boonville, CA
  3. 1.9 11km E of Boonville, CA
  4. 1.5 5km SSW of Boonville, CA
  5. 2.5 6km ESE of Point Arena, CA
  6. 1.6 5km ESE of Boonville, CA
  7. 1.6 19km E of Navarro Head, CA
  8. 2.0 14km WSW of Lakeport, CA
  9. 1.6 14km WSW of Lakeport, CA
  10. 1.6 12km SSE of Boonville, CA
  11. 2.1 19km E of Navarro Head, CA
  12. 1.6 18km SSE of Talmage, CA
  13. 1.9 29km WSW of Sea Ranch, CA
  14. 3.0 21km NNW of Boonville, CA
  15. 2.0 19km SW of Willits, 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.