QuakeIndex

Earthquake · reviewed by a seismologist

M 1.7md

14km E of Angwin, CA

· 0.2 km deep · released about 12 lb of TNT

Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 7 kmYolo County 36 kmSolano County 45 kmSonoma County 55 kmColusa County 69 kmMarin County 69 kmLake County 73 kmSutter County 73 kmContra Costa County 77 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 1.7 (md)
Depth
0.2 km below the surface
Felt
no reports yet
Nearest
Napa County, 7 km SSW
Status
Reviewed by a seismologist

USGS · last changed by USGS · we first saw it 2684 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 12 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.7 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,200,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 870,000× the energy of this one
  3. Around the size people start to feel M 3.0 78× the energy of this one
  4. This earthquake M 1.7 about 12 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 38.5600, -122.2913. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection
Napa County, CA 7 km (4 mi) NNE of here earthquakes near Napa County
Yolo County, CA 36 km (23 mi) WSW of here earthquakes near Yolo County
Solano County, CA 45 km (28 mi) NW of here earthquakes near Solano County
Sonoma County, CA 55 km (34 mi) E of here earthquakes near Sonoma County
Colusa County, CA 69 km (43 mi) S of here earthquakes near Colusa County
Marin County, CA 69 km (43 mi) NE of here earthquakes near Marin County

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

Aftershocks so far

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

  1. 1.8 10km SW of The Geysers, CA
  2. 1.6 14km E of Angwin, CA
  3. 1.6 1km ESE of The Geysers, CA
  4. 1.8 2km SW of Cobb, CA
  5. 2.2 3km NW of The Geysers, CA
  6. 2.2 2km NNW of The Geysers, CA
  7. 1.7 2km N of The Geysers, CA
  8. 2.9 1km NNW of The Geysers, CA
  9. 2.9 1km N of The Geysers, CA
  10. 1.8 12km E of Hidden Valley Lake, CA
  11. 1.6 3km WSW of Cobb, CA
  12. 1.6 2km NE of The Geysers, CA
  13. 1.6 2km ENE of The Geysers, CA
  14. 1.6 2km SW of Anderson Springs, CA
  15. 2.3 2km WNW of The Geysers, 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 4.2 on 2018-01-18 — it released about 5,200 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.