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V (sub S30) empirical prediction relationships based on a new soil-profile database for the Beijing plain area, China

Xie Junju, Paolo Zimmaro, Li Xiaojun, Wen Zengping and Song Yisheng
V (sub S30) empirical prediction relationships based on a new soil-profile database for the Beijing plain area, China
Bulletin of the Seismological Society of America (December 2016) 106 (6): 2843-2854

Abstract

Earthquake ground-motion prediction models usually define site conditions based on the time-averaged shear-wave velocity in the upper 30 m (V (sub S30) ). Proxy-based estimations of V (sub S30) are commonly used, if velocity measurements are not available. We compile a soil-profile database for the Beijing plain area (China), using data from research documents and technical reports. The database contains 479 soil profiles, 463 of which have depths greater than 30 m. We develop regional relationships for the Beijing plain area for extrapolating the time-averaged shear-wave velocity to a given depth less than 30 m to V (sub S30) , and then compare the performance of available models. We find that the second-order polynomial model (Boore et al., 2011), based on data from Japan, provides an overprediction, whereas the linear model (Boore, 2004) calibrated on data from California underestimates V (sub S30) . We develop relationships for estimating V (sub S30) based on proxies such as ground slope gradients from radar-derived digital elevation models (DEMs) and surface geology at different scales. We find that local V (sub S30) data in the Beijing plain are generally lower than existing 30 arcsec gradient-based global models. Regression results show a modest correlation between V (sub S30) and topographic ground slope for several DEM resolutions (3, 15, 30, and 60 arcsec). Geology-based proxies are more effective than ground slope for V (sub S30) estimation in the analyzed area. We propose a bilinear model based on geologic ages and depositional environments for estimating V (sub S30) , which shows a statistically significant trend for application in the Beijing plain area.


ISSN: 0037-1106
EISSN: 1943-3573
Coden: BSSAAP
Serial Title: Bulletin of the Seismological Society of America
Serial Volume: 106
Serial Issue: 6
Title: V (sub S30) empirical prediction relationships based on a new soil-profile database for the Beijing plain area, China
Affiliation: China Earthquake Administration, Institute of Geophysics, Beijing, China
Pages: 2843-2854
Published: 201612
Text Language: English
Publisher: Seismological Society of America, Berkeley, CA, United States
References: 28
Accession Number: 2017-006011
Categories: Seismology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. geol. sketch maps, 4 tables, strat. col.
N39°00'00" - N41°00'00", E116°00'00" - E117°00'00"
Secondary Affiliation: University of California at Los Angeles, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Seismological Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201705
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