QuakeIndex

Earthquake · automatic estimate, may change

M 1.6md

Earthquake near Angwin, CA

Yes. A magnitude 1.6 earthquake was recorded in Angwin, CA, at 11:57 pm PDT on 10 October 2026 (06:57 UTC), less than 1 km deep. The magnitude and location are an automatic first estimate and may change.

This was on 10 October 2026. The latest near Angwin: M 2.6 on 30 September 2026.

USGS: 1 km NE of Angwin, CA

89 km (55 mi) N of San Francisco, CA · 27 km (17 mi) ENE of Santa Rosa, CA

11:57 pm PDT, Oct 10, 2026 · · -0.4 km deep · released about 8.7 lb of TNT

Every earthquake near Angwin Felt it? Tell USGS Check my area
10 km30 km60 km120 km N Napa County 13 kmSonoma County 42 kmYolo County 48 kmSolano County 56 kmLake County 64 kmMarin County 64 kmColusa County 69 kmSutter County 82 kmContra Costa County 85 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
11:57 pm PDT on 10 October 2026 ()
Where
in Angwin, CA · earthquakes near Angwin
Magnitude
M 1.6 (md)
Depth
-0.4 km below the surface
Felt
no reports yet
Nearest
Napa County, 13 km SE
Nearest mapped fault
West Napa fault, 10 km from its surface trace — near is not the same as on
Status
Automatic — a machine’s first estimate, which may change

USGS · last changed by USGS · we first saw it 2 days ago

This was a minor earthquake. Quakes this small are rarely felt and do not cause damage.

At this magnitude and depth, people at rest would likely notice it out to about 12 km (7 mi) from the epicentre. Estimated from magnitude, depth and distance with the intensity equation USGS Did You Feel It? uses; felt reports, where there are any, are the measurement.

Likely felt in: Angwin in town, intensity II · Calistoga 12 km, intensity II. Estimated for each town centre; each link is that town's own record.

How big was it?

This earthquake released about 8.7 lb of TNT. Magnitude is logarithmic: each whole step up releases about 32 times more energy, so a magnitude 2.6 would have released about 32 times as much.

  1. Mineral, Virginia 2011 M 5.8 1,700,000× the energy of this one
  2. Magna, Utah 2020 M 5.7 1,200,000× the energy of this one
  3. Around the size people start to feel M 3.0 110× the energy of this one
  4. This earthquake M 1.6 about 8.7 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.

For this area

The largest earthquake within 50 km since 2016 was M 5.0 on 2016-12-14 — about 110,000 times the energy of this one.

Before 2016, the USGS record lists 3 earthquakes of M5 or more within 50 km:

  1. 6.0 The 2014 South Napa, California Earthquake · 42 km SSE of this epicentre
  2. 5.3 3 km E of Bloomfield, California · 43 km SW of this epicentre
  3. 5.3 Northern California · 44 km SW of this epicentre

Since 2016: the QuakeIndex catalogue (US, M1.5+), built from the USGS FDSN event service. Before 2016: USGS ComCat, M5+ from 1900. Distances are between epicentres. This is the record, not a forecast.

Where

Epicentre 38.5797, -122.4447. Map © OpenStreetMap contributors.

Nearby places

PlaceDistanceDirection from the epicentre
Napa County, CA 13 km (8 mi) SE earthquakes near Napa County
Sonoma County, CA 42 km (26 mi) W earthquakes near Sonoma County
Yolo County, CA 48 km (30 mi) ENE earthquakes near Yolo County
Solano County, CA 56 km (35 mi) SE earthquakes near Solano County
Lake County, CA 64 km (40 mi) NNW earthquakes near Lake County
Marin County, CA 64 km (40 mi) SSW earthquakes near Marin County

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

Aftershocks so far

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

  1. 1.3 5 km WNW of Cobb, CA
  2. 1.1 7 km NW of The Geysers, CA
  3. 0.3 10 km WNW of Cobb, CA
  4. 0.2 5 km WNW of Cobb, CA
  5. 1.3 5 km WNW of Cobb, CA
  6. 0.5 6 km W of Cobb, CA
  7. 0.9 4 km NNW of The Geysers, CA
  8. 1.3 8 km W of Cobb, CA
  9. 0.7 7 km NW of The Geysers, CA
  10. 0.4 9 km WNW of The Geysers, CA
  11. 1.3 4 km W of Cobb, CA
  12. 0.7 10 km WNW of Cobb, CA
  13. 0.7 10 km NW of The Geysers, CA
  14. 0.8 3 km ESE of The Geysers, CA
  15. 1.1 1 km N 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.

On USGS

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