Location

Chicago, Illinois

Session Start Date

4-29-2013

Session End Date

5-4-2013

Abstract

The characteristics of strong ground motion at a given site depend upon the source mechanism, the transmission path together with the geological characteristics of source to the site, and the local soil conditions at the site, mostly known in the engineering and seismological literature as site effects. In the context of the stochastic simulation methods (e.g. Boore 1983), site effects play a significant rule in ground-motion studies. The objective of this paper is the assessment of site effects (both crustal amplification and near surface attenuation) in the Iran plateau. The effects in different parts of Iran were estimated based on the average shear wave velocity of upper 30 m that is presented in site classification system of NEHPR. For deeper depths the global data of CRUST 2.0 model were used and shear wave velocity profiles in different depths were assessed accordingly. Afterwards, using the quarter-wave length method the crustal amplification have been determined for a grid of 1° by 1° over the whole country. In addition the near surface attenuation effect was estimated using the empirical correlation between kappa and shear wave parameters proposed by chandler et al. (2006). The final results are presented as site effects contours in the frequency range of most interest to engineers for the Iranian plateau.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Seventh Conference

Publisher

Missouri University of Science and Technology

Publication Date

4-29-2013

Document Version

Final Version

Rights

© 2013 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Apr 29th, 12:00 AM May 4th, 12:00 AM

Estimation of Site Effects in the Iranian Plateau Using the Quarter-Wavelength Method

Chicago, Illinois

The characteristics of strong ground motion at a given site depend upon the source mechanism, the transmission path together with the geological characteristics of source to the site, and the local soil conditions at the site, mostly known in the engineering and seismological literature as site effects. In the context of the stochastic simulation methods (e.g. Boore 1983), site effects play a significant rule in ground-motion studies. The objective of this paper is the assessment of site effects (both crustal amplification and near surface attenuation) in the Iran plateau. The effects in different parts of Iran were estimated based on the average shear wave velocity of upper 30 m that is presented in site classification system of NEHPR. For deeper depths the global data of CRUST 2.0 model were used and shear wave velocity profiles in different depths were assessed accordingly. Afterwards, using the quarter-wave length method the crustal amplification have been determined for a grid of 1° by 1° over the whole country. In addition the near surface attenuation effect was estimated using the empirical correlation between kappa and shear wave parameters proposed by chandler et al. (2006). The final results are presented as site effects contours in the frequency range of most interest to engineers for the Iranian plateau.