The amplitudes of P-head waves were measured in an aa flow, on unconsolidated cinders, and on compact limestone on sites north of Flagstaff, Ariz. Data are satisfied by an equation for amplitude in terms of distance, attenuation coefficient for P waves, frequuency, and P-wave velocity. The assumption of a complex shear modulus, but a real lambda , furnishes an adequate explanation of published and new data on attenuation of P wave with distance; it also explains the greater attenuation of S waves and relates attenuations to relative velocities of P and S.

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