This study represents an attempt to clarify some anomalous behaviour found in alluvional terrains when subjected to an earthquake. Our approach to the study of granular media has been bibliographic and experimental. Despite many studies carried on this topic, this behaviour is still little understood because of the complex nature of granular media. The goal to the experimental research was at least to confirm the „anomalous“ behaviour reported in previous studies (e.g., chain of force, not-uniform distribution of pressure, etc.). In particular, this study is focused on pressure distributions and their quantification with respect to the pure granular media, and especially refers to the behaviour of natural deposits, which are intermediate between granular and cohesive media.
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