spatial variations of strong motion are generally studied in terms of atten
uation laws far peak ground accelerations with reference to the epicentre,
located from long distance records, The question arises, how a set of stron
g motion records obtained from arbitrarily located stations are inter-relat
ed among themselves and with the epicentre, To answer this question, a new
approach is proposed in this paper by deter mining a force centre statistic
ally from the set of recorded accelerograms.