QuakeIndex

Fault · California

Oak Ridge fault

56 kmlong (35 mi), as mapped
not measuredhow fast it slips
< 15,000 yearssince it last broke the surface
37quakes of M2.5+ within 10 km since 2016

Updated , with the latest earthquake of M2.5 or more within 10 km of the trace: M 3.8, 4 km SE of Piru, CA.

In plain English

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

This week vs. its last ten years

0/100

quiet

No quakes of M1.5+ within 5 km of the trace in the last 7 days. A normal week: 0–0.

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

San Andreas faultGarlock faultNewport-Inglewood-Rose Canyon faultSanta Ynez faultSan Gabriel faultSierra Madre faultPitas Point faultCatalina faultPalos Verdes faultOak Ridge fault (offshore)Mission Ridge fault systemSan Pedro Basin faultSanta Cruz Island faultMalibu Coast faultSanta Cruz faultDume faultSimi-Santa Rosa faultPuente Hills blind thrust systemSan Cayetano faultMid-Channel faultRed Mountain faultPleito faultSanta Monica faultNorthridge blind thrustWheeler Ridge faultRaymond faultVerdugo faultHollywood faultVentura faultIsla Vista fault
The Oak Ridge fault as mapped at the surface (glowing), with the other mapped faults nearby and 37 of the M2.5+ earthquakes within 10 km of it since 2016 (dots). 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.

Most recent near it

  1. M 3.8 4 km SE of Piru, CA
    2026-09-30 · 0 km from the trace
  2. M 2.6 9 km SW of Valencia, CA
    2026-08-12 · 9 km from the trace
  3. M 2.5 1 km NE of Fillmore, CA
    2026-05-02 · 3 km from the trace
  4. M 2.6 1 km NNE of Fillmore, CA
    2026-05-02 · 4 km from the trace
  5. M 2.8 10 km SSW of Valencia, CA
    2026-02-08 · 10 km from the trace
  6. M 2.5 10 km SSW of Valencia, CA
    2025-12-27 · 10 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.