Basal failure surfaces for landslides typically are either curved in a concave-upward sense or nearly planar.

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Quizplus · Accepted Answer

This statement is true. Basal failure surfaces for landslides can either be curved in a concave-upward manner or nearly planar. This is because landslides can occur due to a variety of factors such as slope angle, soil or rock properties, and external forces. The specific type of basal failure surface will depend on these factors.

Basal Failure Surfaces for Landslides Typically Are Either Curved in a Concave-Upward