上下動を含む地震動の解析 : その 2. 表層地盤特性及び震源特性 (特に Slip Vector と Dip Angle) が及ぼす影響について

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In the previous paper we reported the results of statistical analysis on excellence of vertical acceleration to horizontal one by method of factor analysis. In this paper the numerical results on effects of soil condition and source mechanism for excellence of vertical component were reported. The results obtained are as follows ; (1) Amplitude charactristics of the layered soil make the predominant period of observed vertical seismogram shorter than that of horizontal one. (2) According as the layered crust become soft, the increasing tendency of the amplitude rate of the soil is recognized. (3) The angles of incident of P-waves and SV-waves at the layered crust have very important effects on amplitude charactristics of layerd crust, but it is somewhat more significant owing to SV-waves. (4) According as the layered soil become soft, the increasing tendency of the rate of max. vertical amplitude charactristics of the soil to horizontal one is recognized. (5) Slip vector of the fault plane has very significant effects on vertical component of seismograms, especially dip slip type of fault strikehas have more significant effect than that of strike slip. (6) Dip angle of the fault strike has very significant effects on excellence of vertical component of seismograms. In this case of strike slip type of the fault, The vertical motions of the ground increase according as dip angle become little. But in case of dip slip type of the fault strike, the excellence of vertical component is somewhat more complex owing to the location of the station, fault strike and dip angle.
1978-12-30

上下動を含む地震動の解析 : その 2. 表層地盤特性及び震源特性 (特に Slip Vector と Dip Angle) が及ぼす影響について

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