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本論文ではパーセバルの定理と極値理論により導いた地震動スペクトルと地盤増幅度の関係式に基づき地盤増幅度の地震規模依存性を調べた最大地動加速度と最大地動速度を対象に得られた関係式と模擬地震波形から求めた地盤増幅度を比較したところ良い対応が見られた続いて震源スペクトルのパラメータであるコーナー振動数fcや高域遮断振動数fmaxによる地盤増幅度の変化を調べるために地盤増幅度をfcやfmaxによって表現したこの過程でfcの地盤増幅度への影響は最大地動速度が最大地動加速度に比べて大きいことfmaxによる影響は最大地動加速度では明瞭に見られるが最大地動速度では小さいことが明らかになったモーメントマグニチュードMWと地盤増幅度の関係を調べたところ最大地動速度の地盤増幅度はMWによる影響が顕著であったThis study examines dependency of amplification factor on earthquake magnitude based on a relation between spectrum of earthquake motion and site amplification factor derived by Parseval's theorem and extreme value theory. Amplification factor evaluated from a formula proposed here, and one estimated from artificial wave have a good agreement in their comparison. We represented amplification factor by using corner frequency fc and cut off frequency fmax to examine influence of fc and fmax to amplification factor. It is clarified that influence of fc for PGV is larger than that for PGA and influence of fmax clearly affects for PGA but less for PGV. Relationship between moment magnitude Mw and amplification factor is also estimated. Mw is seemed to affect an amplification factor for PGV rather than that for PGA

REPRSENTATION OF AMPLIFICATION FACTOR USING SPECTRUM OF EARTQUAKE GROUND MOTION AND ESTIMATION OF ITS DEPENDENCY ON EARTHQUAKE MAGNITUDE