Mapping of slow landslides on the Palos Verdes Peninsula using the California landslide inventory and persistent scatterer interferometry

摘要: Extremely slow landslides, those with a displacement rate <16 mm/year, may be imperceptible without proper instrumentation. These landslides can cause infrastructure damage on long-term timescale. The objective is to identify these through the combination of information from California landslide inventory (CLI) and ground rates using results persistent scatterer interferometry (PSI), an interferometric synthetic aperture radar (InSAR) stacking technique, across Palos Verdes Peninsula in California. A total 34 ENVISAT images (acquired between 2005 2010) 40 COSMO-SkyMed 2012 2014) were processed. An InSAR (ILI) created four criteria: minimum PS count, average measured velocity, slope angle, aspect. ILI divided into categories: slides (LTSs), potentially active (PASs), relatively stable slopes (RSSs), unmapped extremely (UESSs). categories are based whether previously mapped that (in CLI), if scatterers (PSs) present, PSs unstable or stable. final includes 263 peninsula, them 67 identified as UESS. Although UESS exhibit low velocity small (average area 8865 m2 per slide), their presence highly populated such could lead destruction property over long term.