Probabilistic Seismic Hazard Assessment
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Probabilistic Seismic Hazard Assessment: Direct Amplitude-Based Approach

Probabilistic Seismic Hazard Assessment: Direct Amplitude-Based Approach


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About the Book

This dissertation, "Probabilistic Seismic Hazard Assessment: Direct Amplitude-based Approach" by Hing-ho, Tsang, 曾慶豪, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled "Probabilistic Seismic Hazard Assessment: Direct Amplitude-Based Approach" Submitted by TSANG HING HO for the degree of Doctor of Philosophy at The University of Hong Kong in June 2006 Conventional Probabilistic Seismic Hazard Assessment (PSHA) is difficult to apply in regions whose geological setting (including the location of active faults) is only imperfectly known. Also, for a site-specific PSHA, site effects arising from both crustal rock and overlying soil sediments are generally not assessed rigorously. This thesis demonstrates an alternative procedure for assessing seismic hazard, developed from the conventional Cornell-McGuire PSHA approach, based on considering an infinite number of sources. The proposed new procedure is termed the Direct Amplitude-Based (DAB) approach. A generic analytical solution for the proposed procedure has also been derived in this study, to avoid the need for a lengthy integration process. A site-specific ground motion attenuation model is an important element in seismic hazard assessment. Seismic attenuation behaviour is controlled by a number of wave modification mechanisms, some of which have characteristic specific to a local area or a particular site, while others can be generalised to the entire seismic region. The local seismological parameters include a crustal shear wave velocity (SWV) profile. A comprehensive methodology for modelling the SWV profile in crustal rock has been developed, enabling the amplification mechanisms in the transmission of seismic waves to be estimated. The κ parameter, which characterizes the extent of the near-surface attenuation mechanism in crustal rock, has also been investigated. Empirical correlations of κ with near-surface SWV parameters in crustal rock have been developed. This new modelling approach allows much better seismic hazard assessments to be conducted in regions of low and moderate seismicity. Site effects characterise the filtering mechanisms within the soil sedimentary layers overlying bedrock. A simple, heuristic manual procedure to calculate site amplification factor, site period shift factor and soil damping ratio has been developed. Displacement response spectra (RSD) can then be constructed for soil sites. The proposed model can take into account the nonlinear behaviour of soil that is dependent on the level of shaking, impedance contrast at the soil-bedrock interface and the plasticity of soil materials. Lastly, a case study was carried out, using Hong Kong as an example. SWV information for the four prevalent geological formations found in Hong Kong was first obtained, so as to evaluate the localised near-surface wave modification factors. A ground motion attenuation model was then developed by combining the near-surface modification factors with the regional source function of intra-plate earthquakes. Whilst the ground motion attenuation model was developed, PSHA was performed using the proposed DAB approach. Response spectral values were computed for the whole period range of engineering interest, to form a set of uniform hazard spectra for rock sites in Hong Kong. Site-specific RSD were then constructed for two representative soil and reclamation sites from different parts of Hong Kong. This case study also dealt with the estimation of the lateral building periods. By combining the period estimates with the seismic hazard mode


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Product Details
  • ISBN-13: 9781361429945
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 280
  • Sub Title: Direct Amplitude-Based Approach
  • Width: 216 mm
  • ISBN-10: 1361429941
  • Publisher Date: 27 Jan 2017
  • Binding: Hardback
  • Language: English
  • Spine Width: 18 mm
  • Weight: 939 gr


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