QuakeIndex

Earthquake · reviewed by a seismologist

M 2.5md

2 km NNE of Point Arena, CA

· 4.0 km deep · released about 190 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 59 kmSonoma County 81 kmLake County 84 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 2.5 (md)
Depth
4.0 km below the surface
Felt
14 reports · strongest reported intensity IV
Nearest
Mendocino County, 59 km NNE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 609 days ago

This was a small earthquake. Shaking like this is often felt indoors nearby and very rarely causes damage. 14 people have reported feeling it to USGS.

How big was it?

This earthquake released about 190 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 3.5 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 78,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 55,000× the energy of this one
  3. Around the size people start to feel M 3.0 4.9× the energy of this one
  4. This earthquake M 2.5 about 190 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 38.9347, -123.6922. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 59 km (37 mi) SSW of here earthquakes near Mendocino County
Sonoma County, CA 81 km (50 mi) NW of here earthquakes near Sonoma County
Lake County, CA 84 km (52 mi) WSW of here earthquakes near Lake County
Napa County, CA 128 km (79 mi) WNW of here earthquakes near Napa County
Marin County, CA 128 km (80 mi) NW of here earthquakes near Marin County
Glenn County, CA 134 km (83 mi) WSW of here earthquakes near Glenn County

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

Aftershocks so far

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

  1. 1.7 2 km SSE of Navarro Head, CA
  2. 1.6 20 km SSW of Willits, CA
  3. 1.5 16 km ESE of Boonville, CA
  4. 1.8 14 km NNE of Point Arena, CA
  5. 1.8 2 km SSE of Navarro Head, CA
  6. 1.6 11 km ESE of Boonville, CA
  7. 1.8 14 km S of Willits, CA
  8. 1.9 20 km ESE of Boonville, CA
  9. 1.8 22 km E of Navarro Head, CA
  10. 1.8 4 km NNE of Boonville, CA
  11. 1.5 16 km WNW of Ukiah, CA
  12. 1.6 4 km NNE of Boonville, CA
  13. 1.6 7 km SW of Redwood Valley, CA
  14. 1.6 4 km NW of Point Arena, CA
  15. 1.6 4 km NW of Point Arena, 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.