QuakeIndex

Fault · California

Green Valley fault

39 kmlong (24 mi), as mapped
1–5 mm/yrhow fast it slips
last 150 yearssince it last broke the surface
17quakes of M2.5+ within 10 km since 2016

In plain English

The two sides move 1 to 5 mm a year — 10 to 50 cm (4 to 20 inches) every century.

It has broken the ground surface within the last 150 years.

The largest earthquake recorded near it was M 6.6 in 1892 (Near Vacaville, California) — about 250,000 times the energy of an M3.0, the size people start to feel. It released about 120 kilotons of TNT.

This week vs. its last ten years

0/100

quiet

0 quakes of M1.5+ within 5 km of the trace in the last 7 days — busier than 0% of weeks since 2016. A normal week: 0–1.

Computed from the USGS catalogue · a description of the past, not a forecast · method

San Andreas faultGreat Valley thrust fault systemSan Gregorio faultFoothills fault systemMaacama faultCalaveras faultHayward faultGreenville faultHunting Creek-Berryessa fault systemRodgers Creek faultWest Napa faultBennett Valley faultAlexander-Redwood Hill faultKonocti Bay faultConcord faultPleasanton faultCordelia faultBig Valley faultSerra faultCorral Hollow-Carnegie fault M 6.6 · 1892 · Near Vacaville, California
The Green Valley fault as mapped at the surface (glowing), with the other mapped faults nearby, 17 of the M2.5+ earthquakes within 10 km of it since 2016 (dots), and the epicentres of the large historic earthquakes recorded near it (rings). Traces: USGS Quaternary Fault and Fold Database. Historic epicentres are estimates.

Every year since 2016

Earthquakes of M2.5+ with an epicentre within 10 km of the mapped trace. Near is not the same as on: some will have slipped on neighbouring faults.

The big ones recorded near it

  1. M 6.6 Near Vacaville, California
    April 19, 1892 · epicentre 18 km from the trace

Before 1973 from the USGS ComCat historical catalogue (within 25 km; epicentres of old earthquakes are estimates). Since 2016, M4+ within 10 km.

Most recent near it

  1. M 2.9 20 km W of Winters, CA
    2026-01-14 · 5 km from the trace
  2. M 2.5 12km ESE of Angwin, CA
    2021-08-16 · 6 km from the trace
  3. M 3.6 11km ESE of Angwin, CA
    2021-07-08 · 7 km from the trace
  4. M 2.8 10km ENE of Yountville, CA
    2021-03-23 · 2 km from the trace
  5. M 3.5 13km E of Angwin, CA
    2020-10-26 · 5 km from the trace
  6. M 2.7 12km NNE of Napa, CA
    2019-06-12 · 1 km from the trace

Neighbouring faults

Fault trace, slip rate and age: USGS Quaternary Fault and Fold Database (public domain), simplified for the web. Earthquakes: USGS ComCat. QuakeIndex does not forecast earthquakes; a fault's history describes the past. For early warning use ShakeAlert.