Adjustment of site factors for basin effects from site response analysis and deep downhole array measurements in Taipei

Chi Chin Tsai; Tadahiro Kishida; Wan Chi Lin

doi:10.1016/j.enggeo.2021.106071

Adjustment of site factors for basin effects from site response analysis and deep downhole array measurements in Taipei

Chi Chin Tsai
, Tadahiro Kishida
, Wan Chi Lin

Civil & Environmental Engineering

National Chung Hsing University

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

Abstract

Local site effects can amplify seismic shaking and damage caused by earthquakes. Site factors (SF) are used in seismic design to account for these effects to modify ground motions from a reference rock site. Average shear wave velocity in the top 30 m of soil (V_s,30) is typically used to predict SF. However, recent studies have shown that using V_s,30 alone may be insufficient in quantifying SF under the presence of deep soil deposits and proposed SFs that account for the bedrock depth (e.g. Z_1.0, depth with V_s of 1 km/s). This study evaluates these depth-dependent SFs using 1D nonlinear and equivalent-linear site response analyses. The predicted SFs are also compared with observations of downhole arrays installed within Taipei Basin. Based on numerical and observational results, depth correction factors are recommended in conjunction with SFs of seismic design code to reflect the effect of different sediment thicknesses in the design process.

Original language	British English
Article number	106071
Journal	Engineering Geology
Volume	285
DOIs	https://doi.org/10.1016/j.enggeo.2021.106071
State	Published - May 2021

Keywords

Bedrock depth
Depth correction factor
Downhole array
Site factor
Site response analysis

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10.1016/j.enggeo.2021.106071

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title = "Adjustment of site factors for basin effects from site response analysis and deep downhole array measurements in Taipei",

abstract = "Local site effects can amplify seismic shaking and damage caused by earthquakes. Site factors (SF) are used in seismic design to account for these effects to modify ground motions from a reference rock site. Average shear wave velocity in the top 30 m of soil (Vs,30) is typically used to predict SF. However, recent studies have shown that using Vs,30 alone may be insufficient in quantifying SF under the presence of deep soil deposits and proposed SFs that account for the bedrock depth (e.g. Z1.0, depth with Vs of 1 km/s). This study evaluates these depth-dependent SFs using 1D nonlinear and equivalent-linear site response analyses. The predicted SFs are also compared with observations of downhole arrays installed within Taipei Basin. Based on numerical and observational results, depth correction factors are recommended in conjunction with SFs of seismic design code to reflect the effect of different sediment thicknesses in the design process.",

keywords = "Bedrock depth, Depth correction factor, Downhole array, Site factor, Site response analysis",

author = "Tsai, \{Chi Chin\} and Tadahiro Kishida and Lin, \{Wan Chi\}",

note = "Funding Information: This research is sponsored by Taiwan National Science Council. There is no potential conflict of interest.The authors gratefully acknowledge the support from Taiwan National Science Council under Award no. 108-2628-E-005-001-MY3. The authors also thank the Institute of Earth Sciences, Academia Sinica for providing downhole data of Taipei. The second author also gratefully acknowledge the support by Abu Dhabi Department of Education and Knowledge (ADEK) under the 2018 ADEK Award for Research Excellence (AARE18-148). Funding Information: The authors gratefully acknowledge the support from Taiwan National Science Council under Award no. 108-2628-E-005-001-MY3 . The authors also thank the Institute of Earth Sciences, Academia Sinica for providing downhole data of Taipei. The second author also gratefully acknowledge the support by Abu Dhabi Department of Education and Knowledge (ADEK) under the 2018 ADEK Award for Research Excellence ( AARE18-148 ). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

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doi = "10.1016/j.enggeo.2021.106071",

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AU - Tsai, Chi Chin

AU - Kishida, Tadahiro

AU - Lin, Wan Chi

N1 - Funding Information: This research is sponsored by Taiwan National Science Council. There is no potential conflict of interest.The authors gratefully acknowledge the support from Taiwan National Science Council under Award no. 108-2628-E-005-001-MY3. The authors also thank the Institute of Earth Sciences, Academia Sinica for providing downhole data of Taipei. The second author also gratefully acknowledge the support by Abu Dhabi Department of Education and Knowledge (ADEK) under the 2018 ADEK Award for Research Excellence (AARE18-148). Funding Information: The authors gratefully acknowledge the support from Taiwan National Science Council under Award no. 108-2628-E-005-001-MY3 . The authors also thank the Institute of Earth Sciences, Academia Sinica for providing downhole data of Taipei. The second author also gratefully acknowledge the support by Abu Dhabi Department of Education and Knowledge (ADEK) under the 2018 ADEK Award for Research Excellence ( AARE18-148 ). Publisher Copyright: © 2021 Elsevier B.V.

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N2 - Local site effects can amplify seismic shaking and damage caused by earthquakes. Site factors (SF) are used in seismic design to account for these effects to modify ground motions from a reference rock site. Average shear wave velocity in the top 30 m of soil (Vs,30) is typically used to predict SF. However, recent studies have shown that using Vs,30 alone may be insufficient in quantifying SF under the presence of deep soil deposits and proposed SFs that account for the bedrock depth (e.g. Z1.0, depth with Vs of 1 km/s). This study evaluates these depth-dependent SFs using 1D nonlinear and equivalent-linear site response analyses. The predicted SFs are also compared with observations of downhole arrays installed within Taipei Basin. Based on numerical and observational results, depth correction factors are recommended in conjunction with SFs of seismic design code to reflect the effect of different sediment thicknesses in the design process.

AB - Local site effects can amplify seismic shaking and damage caused by earthquakes. Site factors (SF) are used in seismic design to account for these effects to modify ground motions from a reference rock site. Average shear wave velocity in the top 30 m of soil (Vs,30) is typically used to predict SF. However, recent studies have shown that using Vs,30 alone may be insufficient in quantifying SF under the presence of deep soil deposits and proposed SFs that account for the bedrock depth (e.g. Z1.0, depth with Vs of 1 km/s). This study evaluates these depth-dependent SFs using 1D nonlinear and equivalent-linear site response analyses. The predicted SFs are also compared with observations of downhole arrays installed within Taipei Basin. Based on numerical and observational results, depth correction factors are recommended in conjunction with SFs of seismic design code to reflect the effect of different sediment thicknesses in the design process.

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Adjustment of site factors for basin effects from site response analysis and deep downhole array measurements in Taipei

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