Analysis of seismic site effects in the Tianjin port sea reclamation region
Cao Fuyang
Bi Jinmeng
Tan Yipei
Guo Wei
Abstract：To better analyze the seismic site effects in land reclamation areas and provide a scientific basis for earthquake-resistant engineering design,this study investigates the Dongjiang port land reclamation area in Tianjin.Integrated short-period flow seismometers were used to collect ground motion noise at the site,and the consistency of horizontal-to-vertical(H/V)spectral ratio peaks was analyzed using noise level and H/V ratio methods.Based on long-term observations at fixed points for 26 days,ground motion noise was recorded,and a normalized profile map was generated by converting the H/V curve data using a formula based on dominant frequency and depth.The analysis revealed unstable H/V peak values in the low-frequency range below depths of 50～200 m,suggesting that weak wave impedance interfaces caused by backfill soil exist in the shallow subsurface,with relatively distinct soft sediment interfaces near depths of 50～200 m.The dominant frequencies at the site range of 0.6～1.6 Hz,with amplification factors of 1.96～3.99.This study provides a useful reference for estimating site effects in the Dongjiang port land reclamation area.
Keywords：site effectsea reclamation regionH/V method
Publication Date：2025-09-25
Online Publishing Date：2025-09-12(First online date of this platform, not the publication date of the document)
Pages：7( 507-513 )