## 1 Introduction
The field studies were conducted to evaluate the regional geology and identify the locations, dimensions, and risk level of the risky rock blocks. The probabilistic analysis was used to calculate the maximum run-out distance, velocity, kinetic energy, and bounce heights of falling blocks. The finite element simulations were conducted to evaluate the damage status on the vaulted building, and the cleaning and controlled removal method of the risky blocks was determined. The study concluded by the elimination of the rockfall hazard, and the monastery complex was opened for visitors in 2021. Rockfalls are a significant geological hazard in sloped and mountainous areas, posing serious threats to both human life and infrastructure. Research in this field discusses the dynamics of rockfall events and explores various methods that can be used to mitigate the risks caused by these events. Among these methods, gabion walls stand out as a noteworthy solution. Gabion walls can be described as flexible structures consisting of containers filled with stone or similar hard materials, enclosed by galvanized wire mesh. In the literature, these walls are often studied for their ability to slow the speed of falling rocks and absorb their energy. Additionally, they are favored for their environmental friendliness and aesthetic appeal. A review of the literature reveals numerous studies evaluating the effectiveness of gabion walls against rockfalls. These studies analyze different factors such as the structural properties of the walls, material choices, dimensions, and application methods, detailing how these walls reduce the risk of rockfalls. Moreover, the structural performance of gabion walls has also been examined analytically and experimentally by many researchers. Particularly, the flexible nature, high energy absorption capacity, and ecological compatibility of gabion walls are frequently emphasized in these studies [8; 21; 22; 23]. When the literature is examined, it is clearly seen that rockfall events are frequently studied and solutions are investigated. In these studies, soil/rock characterization was evaluated, and field and numerical studies were carried out. The precautions suggested to be taken in these studies have not been examined for structural integrity. However, examining structural integrity provides a more accurate and realistic approach to the situations that may be encountered in the field. Unlike recent studies in the literature, especially in Turkey, within the scope of this study, the structural behavior of the gabion wall, which is designed at a certain height and width as a result of rockfalls, has been examined. Structural behavior was determined by simulation based on the finite element model. Selendi Stream Basin, which is also included in the study area, is one of the sub-basins in the Gediz Basin which is located in West Anatolia. It is located approximately between 38\({}^{\circ}\)39\({}^{\prime}\)41\({}^{\prime\prime}\)-39\({}^{\circ}\)00\({}^{\prime}\)47\({}^{\prime\prime}\) north latitudes and 28\({}^{\circ}\)39\({}^{\prime}\)14\({}^{\prime\prime}\)-29\({}^{\circ}\)11\({}^{\prime}\)41\({}^{\prime\prime}\) east longitudes (Figure 1). The study site, located in the Selendi Stream Basin, is located in Cortak Village, Selendi district of Manisa province. Severe erosion is observed in the study area due to lithological and geomorphological properties. The high drainage density, the prevalence of badlands topography resulting from surface erosion, gully erosion areas that appear in many different forms, and the sharp ridges separating them from each other, can be considered as leading evidence of severe erosion. This process, which especially affects rocks with low strength,also increases rockfall events in rock masses located at higher elevations. In this article, (a) field studies were evaluated and different measures were examined to reduce rockfall risk. (b) Drone flights were used to evaluate previous studies and obtained \(1/1000\) scale digital topographic maps.