Data analysis for seismic motion characteristics

Ishimaru, Tsunenori; ; *

JNC TN7420 2002-002, 158 Pages, 2002/10

JNC-TN7420-2002-002.pdf:0.56MB

This data analysis, one of the continuous study on the effect of earthquake motion, is aimed for studying characteristics on amplification of acceleration amplitude at deep in the ground to ground surface, using seismic wave records observed via center Array which is located in Shibata-cho, Miyagi Pref. in Kumagai-Gumi Array System for Strong Earthquake Motion (KASSEM) which is located on the Pacific coast in Miyagi and Fukushima Pref.. Using acceleration waves obtained from earthquake observations, the amplification ratios of maximum acceleration amplitude and of root mean square acceleration amplitude which were based on the deepest observation Point were estimated. And comparison between this characteristics on amplification of seismic motion with the analysis data at the Kamaishi-Mine was made. The obtained results are following (1)The amplification ratios estimated from maximum acceleration amplitude and root mean square acceleration amplitude are almost constant in soft rock formation. But, the amplification ratios at the surface in diluvium and alluvium are about 3 to 4 times larger than the ratios in soft rock formation. The amplification ratios estimated from root mean square acceleration amplitude are less dispersed than the ratios estimated from maximum acceleration amplitude. (2)Comparing this analysis results with the results at the Kamaishi-Mine analyzed by Japan Nuclear Cycle Development Institute, in spite of the difference in the rock types and the geologic formation at the observation point, there is a tendency that the amplification ratios at both points are relatively small in the rock foundation and become gradually large toward the ground surface.

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; *

Katsudanso Kenkyu, (19), p.23 - 32, 1999/00

http://doi.org/10.11462/afr1985.2000.19_23

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