QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

12 km SE of Point Arena, CA

· 4.1 km deep · released about 19 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Mendocino County 66 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 1.9 (md)
Depth
4.1 km below the surface
Felt
3 reports · strongest reported intensity III
Nearest
Mendocino County, 66 km N
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 684 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage. 3 people have reported feeling it to USGS.

How big was it?

This earthquake released about 19 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.9 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 790,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 560,000× the energy of this one
  3. Around the size people start to feel M 3.0 50× the energy of this one
  4. This earthquake M 1.9 about 19 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 38.8472, -123.5913. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Mendocino County, CA 66 km (41 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 (72 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

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

  1. 1.8 11 km SSE of Talmage, CA
  2. 1.6 19 km SE of Navarro Head, CA
  3. 1.5 15 km ESE of Boonville, CA
  4. 1.6 15 km ESE of Navarro Head, CA
  5. 2.5 2 km NNE of Point Arena, CA
  6. 1.8 21 km SW of Willits, CA
  7. 1.6 7 km S of Talmage, CA
  8. 2.1 19 km SSE of Boonville, CA
  9. 2.1 5 km SW of Boonville, CA
  10. 2.3 12 km ENE of Navarro Head, CA
  11. 1.7 11 km WNW of Fort Ross, CA
  12. 1.6 13 km SE of Boonville, CA
  13. 2.5 13 km SE of Boonville, CA
  14. 2.7 19 km ESE of Boonville, CA
  15. 1.7 22 km W of Redwood Valley, 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.