QuakeIndex

Fault · California

Tres Pinos fault

15 kmlong (9 mi), as mapped
not measuredhow fast it slips
< 15,000 yearssince it last broke the surface
187quakes of M2.5+ within 10 km since 2016

In plain English

Its most recent surface rupture is younger than 15,000 years.

The largest earthquake recorded near it was M 6.5 in 1840 (Near San Juan Bautista, California) — about 180,000 times the energy of an M3.0, the size people start to feel. It released about 85 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: 0–0.

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

San Andreas faultGreat Valley thrust fault systemSan Gregorio faultCalaveras faultHayward faultGreenville faultMonterey Bay- Tularcitos faultZayante-Vergeles faultOrtigalita faultSargent faultMonte Vista-Shannon faultButano faultPfeiffer Point faultEast Monterey Bay faultQuien Sabe fault M 6.5 · 1840 · Near San Juan Bautista, California M 6.0 · 1841 · Near San Juan Bautista, California M 6.0 · 1883 · Near Hollister, California
The Tres Pinos fault as mapped at the surface (glowing), with the other mapped faults nearby, 187 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 6.5 Near San Juan Bautista, California
    January 18, 1840 · epicentre 23 km from the trace
  2. M 6.0 Near San Juan Bautista, California
    July 3, 1841 · epicentre 22 km from the trace
  3. M 6.0 Near Hollister, California
    March 30, 1883 · epicentre 21 km from the trace
  4. M 4.7 17km SSE of Tres Pinos, CA
    October 15, 2019 · epicentre 10 km from the trace
  5. M 4.4 1km NNW of Tres Pinos, CA
    April 4, 2023 · epicentre 7 km from the trace
  6. M 4.2 10 km S of Tres Pinos, California
    July 19, 2016 · epicentre 9 km from the trace
  7. M 4.1 12km S of Tres Pinos, CA
    November 2, 2018 · epicentre 9 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 2.7 12 km S of Tres Pinos, CA
    2026-01-19 · 10 km from the trace
  2. M 3.2 14 km S of Tres Pinos, CA
    2026-01-17 · 9 km from the trace
  3. M 3.4 14 km S of Tres Pinos, CA
    2026-01-16 · 9 km from the trace
  4. M 3.7 11 km S of Tres Pinos, CA
    2025-09-01 · 9 km from the trace
  5. M 2.9 15 km S of Tres Pinos, CA
    2025-04-13 · 9 km from the trace
  6. M 3.0 3 km SSE of Ridgemark, CA
    2025-04-04 · 8 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.