LANDSLIDE HAZARD ZONATION BASED ON DETERMINISTIC METHOD USING OUTCROP-BASED GEOLOGICAL STRENGTH INDEX (GSI) SYSTEM A CASE STUDY IN KAYANGAN CATCHMENT, KULON PROGO REGENCY, YOGYAKARTA PROVINCE, INDONESIA - , Bagus Haryono ([Yogyakarta] : Universitas Gadjah Mada, 2011)