LANDSLIDES ARE THE DOWNSLOPE MOVEMENT OF SOIL AND/OR ROCK UNDER THE INFLUENCE OF GRAVITY WHICH IS AN IMPORTANT GEOMORPHIC PROCESS SCULPTING THE LANDSCAPES BY TRANSPORTING LARGE VOLUMES OF SEDIMENT FROM SLOPES TO CATCHMENTS THROUGH THE FLUVIAL SYSTEM. DEEP-SEATED LANDSLIDES OCCUPY MORE THAN 20% OF THE LANDSCAPE IN NW CALIFORNIA AND SIMILAR AMOUNTS IN OREGON AND WASHINGTON WITH AN ANNUAL COST OF SEVERAL BILLIONS OF DOLLARS AND TENS OF CASUALTIES NATIONWIDE. AS DEEP-SEATED LANDSLIDES ARE USUALLY COVERED BY DENSE VEGETATION AND STEEP TERRAIN AS WELL AS THICK SNOW DURING WINTERS INTERFEROMETRIC SYNTHETIC APERTURE RADAR (INSAR) COHERENCE IS OFTEN LOST FOR X- C- AND L-BAND RADAR IMAGERY IF THE TIME SEPARATION IS LONGER THAN A FEW DAYS.