QuakeIndex

Fault · Idaho

Lone Pine fault

26 kmlong (16 mi), as mapped
< 0.2 mm/yrhow fast it slips
last 150 yearssince it last broke the surface
12quakes of M2.5+ within 10 km since 2016

In plain English

The two sides move less than 0.2 mm a year — under 2 cm a century. Slow faults can still produce large earthquakes, just rarely.

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

The largest earthquake recorded near it was M 4.3 in 2025 (24 km E of Clayton, Idaho) — about 89 times the energy of an M3.0, the size people start to feel. It released about 43 tons of TNT.

USGS maps it as 2 sections: unnamed northern section, unnamed southern section.

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

Lemhi faultLost River faultBeaverhead faultSawtooth fault
The Lone Pine fault as mapped at the surface (glowing), with the other mapped faults nearby, 12 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 4.3 24 km E of Clayton, Idaho
    June 8, 2025 · epicentre 2 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 3.2 25 km E of Clayton, Idaho
    2025-06-08 · 1 km from the trace
  2. M 4.3 24 km E of Clayton, Idaho
    2025-06-08 · 2 km from the trace
  3. M 2.7 20 km ENE of Clayton, Idaho
    2022-08-02 · 2 km from the trace
  4. M 2.8 32 km E of Clayton, Idaho
    2019-12-25 · 5 km from the trace
  5. M 2.6 12 km SE of Challis, Idaho
    2019-09-01 · 5 km from the trace
  6. M 2.8 8 km ESE of Challis, Idaho
    2018-11-26 · 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.