Seismic anisotropy is the variation in seismic wave velocity with direction within a material. This phenomenon occurs in many different types of materials, including rocks and geological formations. Seismic anisotropy can provide important information about the physical properties and structure of the Earth's crust and mantle, such as the orientation and alignment of mineral grains, fractures, or cracks. By studying seismic anisotropy, researchers can better understand the composition, deformation, and tectonic processes that shape the Earth's interior. This research area is important for various fields, including geophysics, geology, and seismology.