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The deformation type of force sensor is comprised of a conducting polymer strip or foam ( such as polypyrole ) and relies simply on the deformation of the polymer to vary the conducting cross section , thus changing the resistance . Structural geology is the study of the deformation of the earth 's crust and lithosphere . Though a tsunami travels outwards in all directions from its source , the deformation along the fault trace on the ocean floor is linear ; a tsunami , in essence , separates into a pair of waves . A model is required for the deformation over the duration of data-taking , but , because the algorithm is an iterative one , the parameters of the model can be tested by their influence on convergence .