What is a primary factor that geotechnical engineers assess in relation to landslides?

Geotechnical engineers focus on slope stability as a primary factor when assessing the potential for landslides. Slope stability involves analyzing the forces acting on a slope and understanding the material properties, including strength and cohesion of the soil or rock. The stability of a slope can be influenced by various factors, such as the angle of the slope, the weight of the material, water saturation, and external forces like earthquakes. By evaluating these aspects, engineers can determine if a slope is at risk of failure and develop appropriate measures to mitigate landslide risks, such as drainage solutions or slope reinforcement techniques.

While aspects like vegetation health can contribute to slope stability by providing root support, water quality is more focused on the impact of water bodies on ecosystems rather than slope failures. Soil color might provide some insight into the soil's composition or moisture levels, but it does not give a comprehensive understanding of the factors responsible for slope stability or landslide potential.