Abstract
Attenuation of seismic waves in the frequency domain for near- and far-source sites is the key parameter for inferring source properties, simulating ground motions and hazard analysis. The seismic devastation is directly related to the attenuation characteristics of the medium and the amount of seismic energy released during an earthquake. Based on the detailed literature review, it is observed that studies have been done worldwide to understand the attenuation characteristics by estimating frequency-dependent shear-wave attenuation factor (Q) for inter-plate region but very limited studies have focused on intra-plate region. This research paper focuses primarily on the determination of kappa factor (κ) and quality factor (Q) for intra-plate region as this region has scarcity of observed ground motion data sets. Around 105 recorded ground motions were collected from Canada and USA, monitored by Idaho National Laboratory, USA, during 2005–2015. This data is used to determine the farfield source geometric attenuation, kappa factor and inelastic attenuation of Q-value. An attenuation model of Fourier spectral amplitudes for a shear window for both horizontal and vertical components is also determined. Stochastic simulation of the ground motion records using EXSIM was carried out and very well comparable with the recorded ground motion data. It is also observed that spectral analysis of the ground motions shows a reliable match between the simulated and recorded spectra which supports the validity of the source parameters derived in this study. Also the results show that coefficients developed from vertical components are not applicable for horizontal components. Developed parameters kappa and quality factor are very well comparable with existing relationships from the literature. These parameters developed by considering the large data set from USA and Canada can be used for a wide intra-plate region.
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Satyam, N. et al. (2018). Determination of Anelastic Attenuation Factor (Q) and Decay Factor (K) from Ground Motion Records of the Intra-plate Region. In: Krishna, A., Dey, A., Sreedeep, S. (eds) Geotechnics for Natural and Engineered Sustainable Technologies. Developments in Geotechnical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-10-7721-0_21
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