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Excess suspended sediment is an environmental pollutant that can negatively impact the health of river systems. Shallow and sporadic event-driven landslides are a well-known source of sediment in steepland catchments, but less is known of contributions from slow-moving, deep-seated landslides. Few landslide inventories contain information on the activity state and movement rates for these landslides, but this information is necessary to estimate their sediment exports. In this study, we apply a recently developed time-series interferometric synthetic aperture radar (InSAR) and time-series sub-Pixel Offset Tracking (sPOT) landslide monitoring framework to the catchments of the Whanganui Basin in New Zealand to:(1) identify large, actively moving landslides;(2) assess landscape factors that explain the distribution of the active landslides;(3) measure landslide velocities to calculate annual sediment contributions …