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An attempt was made to model observed strong motion velocities and displacements from the April 29, 1965, magnitude 6.5 Puget Sound earthquake. Several different plane layered crustal models were assumed based on previous seismic refraction measurements. Source parameters for the 1965 event were taken from a previous study of teleseismic body waves, Teleseismic P waves recorded at Tumwater, Washington, near the Olympia strong motion site, were examined to place constraints on allowable interface contrasts and to determine whether lateral heterogeniety is a major factor affecting wave propagation. Because of the 60 km source depth and close epicentral distances for the strong motion sites, it proved adequate to approximate ground displacements and velocities by assuming an impinging P or S plane wave under the various crustal models and using a propagator matrix technique to compute the response. Amplitudes were scaled using the generalized ray theory result for direct P, SV, and SH waves from a point dislocation. Although strong motion models qualitatively showed many of the characteristics of near-vertical wave propagation in layered structures, the observed amplitude behavior of individual stations was quite complex. Data from Tacoma and Seattle sites, close to the epicenter, attained lower velocities and acceleration compared to Olympia which was three times as far. The amplitude behavior is consistent with higher attenuation under Tacoma and Seattle although this is not strictly required. The short-period P data recorded at Tumwater showed evidence of large

Calculation of strong ground motion and local field-far field relationships for the April 25, 1965, Puget Sound, Washington, earthquake