Characteristics and controlling factors of seismic site response at a crystalline bedrock site based on quality factor inversion using deep borehole data.

ABSTRACT: This study evaluated epistemic uncertainty in shear-wave velocity (Vs) profiles and variability in shear-wave quality factor (Qs) profiles across broadband frequencies to investigate characteristics and controlling factors of seismic site response at a crystalline bedrock site. This study utilized deep borehole data down to the seismological bedrock at a depth of 2000 m. Multiple invasive measurements were conducted to estimate the Vs profiles. Three-component seismometers were installed at depths of 5, 160, 500, and 2000 m for Qs profiling. A logic tree with 128 analysis patterns was employed to capture the frequency-dependent percentiles of the amplification factor (AF) and the Qs parameter through spectral ratio Qs inversions. AFs from depths of 2000 m to 5 m showed the attenuation effe

SUBMITTER: Nishizaka N 

PROVIDER: S-EPMC12006475 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature