The exact and approximate conditional spectra in the multi-seismic-sources regions

Ebrahimian, H ; Sharif University of Technology | 2012

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  1. Type of Document: Article
  2. DOI: 10.1016/j.soildyn.2012.03.004
  3. Publisher: Elsevier , 2012
  4. Abstract:
  5. The exact and two approximate conditional spectra are compared in this manuscript as a target spectrum for the purpose of ground motion selection. The considered site is a real offshore site located at South Pars Gas Field in the Persian Gulf region. This case study site is influenced by four major seismic area sources in which the deaggregation results confirm that many comparable seismic scenarios can be taken into account. Therefore, an alternative to the conventional approximate conditional spectrum is proposed that has a small deviation from the exact solution. In addition, the use of different conditioning status of the probabilistic seismic hazard deaggregation (i.e., occurrence versus exceedance of the target spectral acceleration) for calculating the exact distribution of conditional spectrum was investigated. The results show that one of the proposed approximate approaches leads to conditional distributions which provide acceptable agreement with those obtained from the exact solution
  6. Keywords:
  7. Nonlinear dynamic analysis ; Probabilistic seismic hazard deaggregation ; Selection of ground motion records ; Conditional distribution ; Conditional spectrum ; De aggregations ; Exact distribution ; Exact solution ; Gas fields ; Persian Gulf region ; Seismic area ; Seismic scenarios ; Spectral acceleration ; Study sites ; Target spectrum ; Dynamics ; Gas industry ; Seismology ; Probability distributions ; Earthquake mechanism ; Earthquake trigger ; Ground motion ; Nonlinearity ; probability ; Seismic hazard ; Seismic source ; Seismic zone ; Spectral analysis ; Arabian Sea ; Indian Ocean ; Persian Gulf ; South Pars Field
  8. Source: Soil Dynamics and Earthquake Engineering ; Volume 39 , August , 2012 , Pages 61-77 ; 02677261 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S026772611200067X