Multi-criteria assessment approach of slow-moving urban landslide hazard: the case of Moulay Yacoub, Morocco

During many decades, the town of Moulay Yacoub underwent an important urban expansion to meet high demand on housing fuelled by tourism activities, which constitute backbone town’s economy. Unfortunately, majority buildings, both private and public, suffer from varying levels damage related lithological, climate, geomorphic settings area. In fact, is built a marly hill prone various types mass movements, ranging shallow soil creep large slides. addition, vertical displacement swelling/shrinkage behaviour these Miocene marls widespread in The present paper presents multi-disciplinary approach investigate activity interaction between slow-moving landslides expansive soils within perimeter Yacoub. severe seasonal contrast characterised intense rainfall over short periods constitutes main triggering factor instability phenomena region. Moreover, desiccation cracks affecting are indicators their behaviour, very obvious geotechnical tests results. other parameters obtained laboratory show that marl samples severely weathered compared with those compact material extracted at greater depth. borehole data seismic noise survey allows detection several impedance contrasts corresponding layer – bedrock boundary, some cases corresponds rupture surface inventoried landslides. slow but perennial later processes well documented inclinometers, PS-InSAR monitoring, building assessment surveys. Indeed, this case study highlights complementarity techniques used give multi-faceted understanding slope should provide blueprint for future site-specific studies