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Two-stage nonlinear site amplification modeling for Japan with V (sub S30) and fundamental frequency dependency

Dong Youp Kwak and Emel Seyhan
Two-stage nonlinear site amplification modeling for Japan with V (sub S30) and fundamental frequency dependency
Earthquake Spectra (August 2020) 36 (3): 1359-1385

Abstract

We describe a two-stage nonlinear site amplification model that considers both the sediment depth and the fundamental frequency of the soil. Adopting a non-reference site approach, empirical site amplification ratios for 1591 Kyoshin and Kiban Kyoshin network sites are developed. This process involves analyzing 92,025 surface ground motion recordings from 305 earthquakes between 1997 and 2012. The model is developed in two stages: first, we regress the total empirical site effects in terms of V (sub S30) ; second, we fit a functional form to the residuals from the first stage using the fundamental period of the site. We validate the model through residual analyses and statistical methods. This study shows that the peak soil period increases with the equivalent shear strain (Igamma ), while the peak amplitude decreases with Igamma . The first-stage site term reduces the error at mid-to-long period ranges (>0.1 s) by 0.11 from the error of the initial site term without any constraints. The second-stage site term reduces the error further as 0.06. Finally, we discuss the model limitations and the applicability range of the predictor variables.


ISSN: 8755-2930
EISSN: 1944-8201
Serial Title: Earthquake Spectra
Serial Volume: 36
Serial Issue: 3
Title: Two-stage nonlinear site amplification modeling for Japan with V (sub S30) and fundamental frequency dependency
Affiliation: Hanyang University, Civil and Environmental Engineering, Ansan, South Korea
Pages: 1359-1385
Published: 202008
Text Language: English
Publisher: Earthquake Engineering Research Institute, Berkeley, CA, United States
References: 33
Accession Number: 2021-006875
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table, sketch map
N30°00'00" - N45°00'00", E129°00'00" - E147°00'00"
Secondary Affiliation: Risk Management Solutions, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2021, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 202105
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