Using stochastic finite-fault modeling to study the site effect in the Taipei basin

• Main Authors: Chun-Te Chen, 陳俊德
• Other Authors: none
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/3q9tp3

碩士 === 國立中央大學 === 地球物理研究所 === 94 === In this study, the method of the stochastic finite-fault modeling is used to analyze site effect in the Taipei basin. Local site effects are considered by soil/rock spectral ratios calculated as ratios between spectra of chi-chi earthquake record and finite-fault modeled for rock site. The dominant frequency and amplification are the indicator clearly show that local site effect. The data records at 14 Site class B TAP stations are aimed the model calibration. Simulation and spectra ratio analysis indicate that TAP103 is an unusual rock site which is recorded large ground motions and may be caused by geography effect. In Taipei basin the Dominant frequency range from 0.5Hz to 1.5Hz, but in Xinyi and Shulin are about 2.0Hz, higher than other sites. The calibrated model is then used to simulate chi-chi earthquake ground motion on soil site with average transfer function and main shock transfer function that estimated by the spectra-ratio technique. The result shows that the H/V technique no absolute response the chi-chi earthquake amplification effect, revel there are 2D-3D effects influence the site effects.