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In exploration seismology, mapping the Earth's interior structure in more detail is of great interest. The rocks' microstructures, such as cracks, play an essential rule in oil and gas exploration and production. We study elastic nonlinearity because the microstructures are the main reason for this phenomenon. Nonlinearity is also related to the velocity change due to perturbations in the stress filed within the rocks. Many studies have observed the nonlinearity in field data as well asdoi:10.48336/0wc4-3r10 fatcat:yd6vxflfjfeejd2eowwejeovui