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There are two kinds of seismic body waves in solids, pressure waves (P-waves) and shear waves. In linear elasticity, the P-wave modulus M {\displaystyle M} , also known as the longitudinal modulus, or the constrained modulus, is one of the elastic moduli available to describe isotropic homogeneous materials.
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p-wave seismic displaystyle material body stress strain density two kinds waves solids pressure p-waves shear linear elasticity modulus also known
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