Analysis of a Worldwide Strong Motion Data Sample to Develop an Improved Correlation Between Peak Acceleration,Seismic Intensity and Other Physical Parameters,

摘要

A data base consisting of nearly 1600accelerograms was assembled from the Western U.S.,Japan,Southern Europe,and New Guinea. Statistical analysis of the accelerograms led to an equation in which maximum acceleration is a function of intensity,magnitude,and epicentral distance. A similar equation was developed in which magnitude was replaced with epicentral intensity. Further analyses of the accelerograms showed that the New Guinea and Southern European records have significantly higher peak accelerations at fixed intensity levels than the Western U.S. and Japanese records. Using both theoretical models and specific examples,variations in site ground motion responses were shown to be dependent on the thickness of the alluvium beneath the recording station. Predominant periods and duration,defined with spectral parameters,were not significant variables in the acceleration-intensity correlation. Reduction of the scatter in acceleration-intensity correlations may result if seismic intensity is correlated with response spectral amplitudes which show small variations in narrow period bands. Such a correlation is independent of geographic location and thus should be directly applicable to siting situations in the Eastern U.S.