SUMMARY
The stability and vulnerability analyses carried out on the Stylite tower at Umm ar-Rasas, Jordan, are presented in this paper. The tower is a unique example of this kind of structure still existing. The soil and the structural material were analyzed by means of in situ ex- perimental tests. These consisted of Schmidt-hammer tests on stone blocks and passive seismic measurements. The stability of the tower was first analyzed, assuming an elastic – perfect plastic behavior in compression for masonry. Then the push-over seismic analysis was carried out, which was based on a single-mode approach and a finite solid element modelling with a Drucker-Prager yield criterion for masonry. The work is propaedeutic to the design of a retrofit intervention.