QuakeIndex

Fault · California

Rocky Ledge fault

18 kmlong (11 mi), as mapped
0.2–1 mm/yrhow fast it slips
< 15,000 yearssince it last broke the surface
9quakes of M2.5+ within 10 km since 2016

In plain English

The two sides move 0.2 to 1 mm a year — 2 to 10 cm every century.

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

The largest earthquake recorded near it was M 5.0 in 2023 (12 km NE of Burney, CA) — about 970 times the energy of an M3.0, the size people start to feel. It released about 460 tons 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

Honey Lake faultCedar Mountain fault systemHat Creek faultMcArthur faultAlmanor faultPittville faultMayfield fault
The Rocky Ledge fault as mapped at the surface (glowing), with the other mapped faults nearby, 9 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.

The big ones recorded near it

  1. M 5.0 12 km NE of Burney, CA
    September 8, 2023 · epicentre on the trace
  2. M 4.3 12 km NE of Burney, CA
    September 8, 2023 · epicentre on 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 2.6 11 km ESE of Burney, CA
    2026-07-17 · 3 km from the trace
  2. M 2.7 11 km WSW of Fall River Mills, CA
    2023-11-20 · 1 km from the trace
  3. M 2.8 8 km W of Fall River Mills, CA
    2023-09-15 · 5 km from the trace
  4. M 2.7 11 km WSW of Fall River Mills, CA
    2023-09-08 · 1 km from the trace
  5. M 2.8 12 km NE of Burney, CA
    2023-09-08 · 0 km from the trace
  6. M 4.3 12 km NE of Burney, CA
    2023-09-08 · 0 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.