QuakeIndex

Earthquake · reviewed by a seismologist

M 1.9md

15 km ESE of Point Arena, CA

· 2.4 km deep · released about 24 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Sonoma County 64 kmMendocino County 65 kmLake County 74 kmNapa County 112 kmMarin County 113 kmColusa County 118 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
2.4 km below the surface
Felt
no reports yet
Nearest
Sonoma County, 64 km SE
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 96 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 24 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 5.8 640,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 450,000× the energy of this one
  3. Around the size people start to feel M 3.0 40× the energy of this one
  4. This earthquake M 1.9 about 24 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 38.8548, -123.5363. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Sonoma County, CA 64 km (40 mi) NW of here earthquakes near Sonoma County
Mendocino County, CA 65 km (40 mi) S of here earthquakes near Mendocino County
Lake County, CA 74 km (46 mi) WSW of here earthquakes near Lake County
Napa County, CA 112 km (70 mi) WNW of here earthquakes near Napa County
Marin County, CA 113 km (70 mi) NW of here earthquakes near Marin County
Colusa County, CA 118 km (73 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

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

  1. 1.7 10 km W of Boonville, CA
  2. 1.8 10 km W of Boonville, CA
  3. 2.7 10 km W of Boonville, CA
  4. 3.7 10 km W of Boonville, CA
  5. 1.9 14 km S of Willits, CA
  6. 1.6 5 km ESE of Boonville, CA
  7. 1.7 5 km SW of Redwood Valley, CA
  8. 1.9 4 km SSE of Cloverdale, CA
  9. 2.0 15 km W of Ukiah, CA
  10. 1.6 15 km ESE of Navarro Head, CA
  11. 1.7 15 km NW of Cloverdale, CA
  12. 1.6 7 km S of Boonville, CA
  13. 1.7 7 km SSW of Boonville, 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.

For this area

The largest earthquake within 50 km in our catalogue was M 4.4 on 2020-12-06 — it released about 4,900 times the energy of this one.

From the QuakeIndex catalogue, built from the USGS FDSN event service.

On USGS

QuakeIndex does not issue warnings. For earthquake early warning see ShakeAlert.