BUTSURI-TANSA(Geophysical Exploration)
Online ISSN : 1881-4824
Print ISSN : 0912-7984
ISSN-L : 0912-7984
Rapid Letter
Evaluation of ground vibration characteristics by using microtremor array survey in Kuji City, Iwate Prefecture
Hidekazu YamamotoTakuya IshikawaTsuyoshi Saito
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2019 Volume 72 Pages 8-16

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Abstract

We carried out microtremor observations with a miniature array in the coastal area of Kuji city, Iwate prefecture and we tried to estimate shallow S wave velocity structures using microtremor H/V and phase velocity dispersion curves. The site amplification factors from the engineering bedrock based on an average S-wave velocity were evaluated. Then, the SH wave amplification ratios as a function of frequency were also calculated by using the S-wave velocity structure model. The results are shown as follows: Shallow S-wave velocities in the coastal area of Kuji City were very slow and were about 100m/s. The estimated structure in this area indicated the bowl-shape. The amplification factors obtained from microtremor observations were larger than the site amplification factor of J-SHIS. The amplification characteristics of the SH wave showed that the maximum of the amplification factor was six times at a frequency of 1 Hz.

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© 2019 The Society of Exploration Geophysicists of Japan
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