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Comparison between Ground-Motion Characteristics on Plateau and Lowland Sites Based on Strong-Motion and Microtremor Observations.

Accession number;99A0228800

Title;Comparison between Ground-Motion Characteristics on Plateau and Lowland Sites Based on Strong-Motion and Microtremor Observations.

Author; TOSHINAWA TAKUMI (Tokyo Inst. of Technology, Graduate School) YAMAZAKI HIROAKI (Sato Kogyo Co., Ltd.)

Journal Title;Proceedings of JSCE (Japan Society of Civil Engineers)

Journal Code:F0028A

ISSN:0289-7806

VOL.;NO.612;PAGE.265-274(1999)

Figure&Table&Reference;FIG.16, TBL.1, REF.17

Pub. Country;Japan

Language;Japanese

Abstract;Strong-motion and microtremor observations are carried out in loam plateaus and Holocene lowlands in the Hassaku area, Yokohama, to investigate site-amplification characteristics in the area. Strong-motion observations show that a plateau site has larger site-amplification characteristics in comparison to lowland sites by a factor of about 1.5 in peak horizontal ground velocity and about 2 in spectral peak amplitude of Fourier acceleration spectra. The amplification is due to subsurface soils which are accumulated on soft rocks. Microtremor observations demonstrate that resonance periods on plateaus are related to elevation; high site amplification areas distribute along rivers in the lowlands and on the Shimosueyoshi plateau. (author abst.)

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