| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2012: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
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| Outline of Final Research Achievements |
We evaluated spatial variations of seismic ground motions in hard soil, focusing on the difference of depth levels and horizontal and vertical components in addition to the frequency and the distance between the observation points, using the strong motion records in the three-dimensional array observation system arranged in the Hamaoka Nuclear Power Station. We derived the statistical models of coherence and standard deviation of Fourier amplitude ratio based on the regression analyses concerning frequency and horizontal distance from the spatial variation features of seismic ground motions. It was shown that the coherency decreased with increasing frequency and the distance. The degree of the decrease in the vertical component was larger than that in the horizontal component, also it is larger shallow in depth levels. The standard deviation of Fourier amplitude ratio under 5Hz increased with increasing frequency and the distance, but that was constant in the range greater than 5Hz.
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