横浜市高密度強震計ネットワークの記録に基づく 地盤 ... - 日本地震工学会

( 受 理 :2008 年 5 月 2 日 )
( 掲 載 決 定 : 2008 年 6 月 16 日 )
Relationships between Average Shear-Wave Velocity and
Site Amplification Factors Obtained by
Records from Yokohama Dense Strong-Motion Network
MIDORIKAWA Saburoh 1) , KOMAZAWA Makoto 2) and MIURA Hiroyuki 3)
1) Member, Professor, Department of Built Environment, Interdisciplinary Graduate School of Science and
Engineering, Tokyo Institute of Technology, Dr. Eng.
2) Formerly Graduate Student, Department of Built Environment, Interdisciplinary Graduate School of Science
and Engineering, Tokyo Institute of Technology, Ms. Eng.
3) Member, Assistant Professor, Department of Built Environment, Interdisciplinary Graduate School of Science
and Engineering, Tokyo Institute of Technology, Dr. Eng.
ABSTRACT
The relationships between average shear-wave velocity of the ground and the site amplification factor for peak
ground acceleration, peak ground velocity, seismic intensity and response spectral amplitudes are examined by
using the strong motion records from the Yokohama Dense Strong-Motion Network. Regarding the amplification
factors for peak ground acceleration, peak ground velocity and seismic intensity, the results by the records from
smaller magnitude earthquakes and from larger magnitude earthquakes are different. This is due to the different
spectral contents of the records from smaller and larger earthquakes. The amplification factors for peak ground
acceleration, peak ground velocity and seismic intensity show higher correlations with the average shear-wave
velocities of the ground down to 10m, 30m and 20 to 30 m, respectively. The amplification factors for response
spectral amplitudes for shorter, mid and longer periods show higher correlations with the average shear-wave
velocities of the ground down to 10m, 20m and 30 m, respectively. The correlations of the spectral amplitude at
longer period range are higher than those at shorter period range.
Key Words: Site Amplification Factor , Average Shear-Wave Velocity, Peak Ground Acceleration,
Peak Ground Velocity, Seismic Intensity, Response Spectra
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