Multifault Opposing‐Dip Strike‐Slip and Normal‐Fault Rupture During the 2020 M _w 6.5 Stanley, Idaho Earthquake

On March 31, 2020, an Mw 6.5 earthquake struck near Stanley, Idaho. More than 35% nondouble-couple component in long-period point-source solutions indicate a more complex source slip on planar fault. Using integrative analysis of seismological and geodetic data, we find that the Stanley ruptured pair opposing-dip faults offset by 10-km-wide step, including unmapped northern subfault with predominantly strike-slip faulting southern subparallel to Sawtooth fault normal faulting. This converging geometry allowed rupture traverse surficial which is greater limiting dimension (3–4 km) commonly ceases ruptures. study reveals composite process typical for earthquakes located boundary Centennial Tectonic Belt (CTB), distinct from central CTB.