Abstract Database

ESTIMATION OF SHEAR WAVE VELOCITY STRUCTURE USING ARRAY OBSERVATION OF SHORT PERIOD MICROTREMOR IN KOSHIGAYA CITY, JAPAN

MEE07161
Dayra Yessenia BLANDON SANDINO
Supervisor: Toshiaki YOKOI
Country: Nicaragua
Abstractfulltext

In this study, Spatial Autocorrelation Method (SPAC Method) was carried out in Koshigaya City, Saitama Prefecture, Japan. Additionally, we applied H/V spectral ratio or Nakamura method to the same area.

We obtained that in the western part of the study area the engineering bedrock (Vs>400m/sec) is as shallow as 10-15 m, where as in the eastern part it is much deeper and reaches to 50-60m. The former is categorized in Class D or Stiff Soil of NEHRP (2001) Ground Classification, and the latter in Class E or Soft Soil. We could obtain the same soil classification by implementing the method proposed by Kon’no et al. (2007), which allow us to skip the inversion of the dispersion curve.

Finally, H/V spectral ratio could not show any correlation of its predominant period with the underground velocity structure determined by SPAC method. Furthermore, with the provided information from Nakamura method it is difficult to obtain the ground classification at a site.

Citation: Bulletin of IISEE, 43, 31-36.