THE EFFECT OF THE UPPERLIMIT FOR EARTHQUAKE MAGNITUDE IN POTENTIAL HYPOCENTER AREA TO THE CHARACTERISTIC PERIOD OF BEDROCK ACCELERATION'S RESPONSE SPECTRUM

Both seismological theory and macroseismic observation show that the shape of strong motion response spectrum depends mainly on magnitude,distance of epicenter and engineering site condition.since it is considered just the effect of engineering site condition and epicenter distance of only site condition to determine the characteristic period of acceleration response spectrum (Tg) in the antiseismic design criterion of our country at present,the characteristic period of response spectrum determined from those critetion is different from that got from special seismic hazard analysis.The effect of magnitude's upper limit in potential source region to Tg is discussed in this paper.The conclusion is that the higher of the upper limit,the bigger of the Tg.