« Morphometric Analysis… | Home | The cryptic seismic p… »

Fast Holocene slip and localized strain along the Liquiñe‐Ofqui strike‐slip fault system, Chile

Friday 19 August 2022 at 7:13 pm.

In active tectonic settings dominated by strike‐slip fault systems, slip partitioning along subparallel faults is a common feature; therefore, elucidating the degree of partitioning and strain localization is paramount for seismic hazard assessments. Here we used the surface classification model (SCM) of TerraceM to map the surface morphology of fluvial terraces. Then by measuring the offset between the maped fluvial terraces we estimated a slip rate of 18.8 ± 2.0 mm/year over the past 9.0 ± 0.1 ka for a single strand of the Liquiñe‐Ofqui Fault System. The fast millennial slip rate in the absence of historical Mw > 6.5 earthquakes along the Liquiñe‐Ofqui Fault System implies either a component of aseismic slip or Mw ~ 7 earthquakes involving multi‐trace ruptures and > 150‐year repeat times.