The paper presents the results of a study to determine the influence of local geological conditions on the attenuation of peak accelerations and peak velocities, with increasing distance from the source of energy release, for earthquakes with a magnitude of about 6.5 occurring in the western part of the United States. While the results can only be considered to be strictly applicable to these conditions, it is hoped that they can also serve as a guide to possible relationships between peak accelerations and peak velocities which may be expected for earthquakes of higher magnitudes occurring in different locations and thereby serve a useful purpose in the difficult task of predicting the likely characteristics of earthquake ground motions in different geological settings.

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