QuakeIndex

Fault · California, Oregon

Cedar Mountain fault system

69 kmlong (43 mi), as mapped
0.2–1 mm/yrhow fast it slips
last 150 yearssince it last broke the surface
3quakes 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.

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

USGS maps it as 4 sections: Cedar Mountain section, Ikes Mtn.-Mt. Hebron section, Mahogany Mountain section, Stephens Pass section.

This week vs. its last ten years

Too quiet to rank: fewer than half a year's worth of weeks with any M1.5+ quake within 5 km, in ten years. A single quake here would read as "unusual", so we do not score it.

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

Klamath graben fault systemSky Lakes faultMayfield fault
The Cedar Mountain fault system as mapped at the surface (glowing), with the other mapped faults nearby, 3 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 2.5 6km SW of Dorris, CA
    2021-11-07 · 5 km from the trace
  2. M 2.7 6 km SSW of Tennant, California
    2017-05-25 · 6 km from the trace
  3. M 2.5 5 km S of Tennant, California
    2017-02-27 · 5 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.