The thresholds can be established using empirical or physical methods. Empirical rainfall thresholds are defined by statistically studying past rainfall events that led to landslides. While the rainfall thresholds for landslides can be helpful in assessing landslide susceptibility and risk, they have certain limitations that can lead to false and missed alarms [13; 19; 20; 21; 22]. Empirical landslide-rainfall threshold relationships can significantly affect the reliable prediction of the occurrence times of landslides since they do not usually consider non-triggering rainfall, antecedent conditions, landslide mechanism, and soil geotechnical properties [22; 23; 24; 25; 26]. A well-defined rainfall threshold model should aim to achieve both high accuracy in detecting actual landslide events and minimize false alarms [20; 21]. Physically based methods use infiltration models (e.g., steady-state, transient-state) to relate rainfall events to slope stability analysis. Providing a theoretical framework for the slope failure process due to rainfall infiltration, physically based methods attempt to predict temporal and spatial distributions of rainfall-induced landslides through Geographic Information Systems (GIS) [27; 28; 29]. Despite its usefulness for future research, the method also has certain limitations. Comprehensive spatial data on hydrological, geological, morphological, and soil properties are necessary to simulate landslide initiation for physical methods accurately. Accurately gathering this information over extensive areas is challenging, and it is seldom accessible. The current study can provide a database with extensive instrumental monitoring work. On the other hand, saturated soil mechanics methods are also frequently used in landslide analysis. However, these methods do not consider the unsaturated strength and unsaturated hydraulic properties of the soils. Unsaturated soils contain water and air in their pore spaces. Unlike saturated soils, where all the voids are filled with water, unsaturated soils have varying degrees of water saturation. Factors such as matric suction, moisture content and unsaturated permeability play significant roles in the behavior of unsaturated soils. When analyzing the behavior of unsaturated soils, relying solely on saturated soil mechanics can be insufficient [23; 30; 31; 32]. Depending on the precipitation and evaporation cycle on the earth, there are various changes in water content, matric suction and underground water level in the soil. Depending on these variations, the shear strength of the soil changes. Studies on the stability of slopes showed that the infiltration of rainfall into unsaturated soil slopes significantly affects the stability of the slopes [33; 34; 35; 36; 37; 38; 39; 40]. Soils that are not initially saturated have a certain matric suction before the rainfall. This matric suction has an increasing effect on the shear strength of the soil. With the infiltration of rainfall into the unsaturated soil, the water content and saturation of the soil start to increase, and the matric suction tends to decrease. Instability can occur when the matric suction at the critical slip surface of the slope decrease or when the matric suction is completely lost, and positive-pore water pressures develop. The development of this behavior is a very complex issue depending on various parameters such as rainfall intensity, rainfall duration, slope geometry, hydro-mechanical properties and initial boundary conditions (groundwater level, water content, degree of saturation, matric suction, etc.) [41; 42; 43]. The clarification of this mechanism for various geographical regions where rainfall-induced landslides are observed will make significant contributions to the landslide literature. In this study, a representative landslide area was determined in order to elucidate the hydro-mechanical behavior of landslides in Bartin.