QuakeIndex

Earthquake · reviewed by a seismologist

M 2.4md

7km ESE of Point Arena, CA

· 7.0 km deep · released about 140 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 61 kmSonoma County 73 kmLake County 79 kmNapa County 120 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
7.0 km below the surface
Felt
2 reports · strongest reported intensity III
Nearest
Mendocino County, 61 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 3070 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 2 people have reported feeling it to USGS.

How big was it?

This earthquake released about 140 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 5.8 110,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 78,000× the energy of this one
  3. Around the size people start to feel M 3.0 6.9× the energy of this one
  4. This earthquake M 2.4 about 140 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 38.8963, -123.6152. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 61 km (38 mi) SSW of here earthquakes near Mendocino County
Sonoma County, CA 73 km (45 mi) NW of here earthquakes near Sonoma County
Lake County, CA 79 km (49 mi) WSW of here earthquakes near Lake County
Napa County, CA 120 km (75 mi) WNW of here earthquakes near Napa County
Marin County, CA 121 km (75 mi) NW of here earthquakes near Marin 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

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

  1. 2.4 16km ESE of Boonville, CA
  2. 2.9 16km SE of Boonville, CA
  3. 2.3 16km ESE of Boonville, CA
  4. 1.7 14km WSW of Lakeport, CA
  5. 2.7 16km NW of Cloverdale, CA
  6. 1.6 5km SE of Talmage, CA
  7. 1.8 14km SSE of Boonville, CA
  8. 2.4 18km WSW of Lakeport, CA
  9. 2.5 12km SE of Talmage, CA
  10. 2.4 16km ESE of Navarro Head, CA
  11. 2.5 8km W of Boonville, CA
  12. 2.1 18km S of Boonville, CA
  13. 2.0 15km SE of Boonville, CA
  14. 1.6 13km NW of Sea Ranch, CA
  15. 1.7 20km WSW 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.