A Shear-Wave Velocity Model for V-S30 Estimation Based on a Conditional Independence Property

作者：Dai, Zhijun^*; Li, Xiaojun; Hou, Chunlin

来源：Bulletin of the Seismological Society of America, 2013, 103(6): 3354-3361.

DOI：10.1785/0120130025

• AVERAGE HORIZONTAL COMPONENT
• GROUND-MOTION
• SITE AMPLIFICATIONS
• RESPONSE SPECTRA
• VS30
• CLASSIFICATION
• PREDICTION
• PERIODS
• PGV

The time-averaged shear-wave velocity of up to 30 m (V-S30), a vital parameter in building codes, is widely used in site classification and plays an important role in the analysis of site effects. Recently, the log-linear correlation (Boore, 2004) has become more prevalent to estimate V-S30 of velocity profiles that do not extend to 30 m. In this study, we make a full analysis on the linear correlation with three publicly available data sets of shear-wave velocity profiles. A conditional independence property is derived from the partial correlation analysis of the data sets. Using this property, a new V-S30 estimation model is proposed. Comparison of models based on the setup of training and testing data sets suggests that the new model achieves improved performance on the V-S30 estimation. The impact of errors of estimation models on the prediction of ground-motion parameters is also evaluated, and the overall error of the predicted parameter by the new model is the least, especially at long periods.

• 出版日期2013-12
• 单位环境保护部核与辐射安全中心; 中国地震局