1
Centre for Earthquake Engineering Research (CEER), Department of Civil Engineering, University of Hong Kong
2
Department of Civil and Environmental Engineering, The University of Melbourne
3
Department of Civil Engineering, The University of Hong Kong
Abstract
The significance of near-surface attenuation in bedrock, as distinct from attenuation in unconsolidated soft soil sediments, has been identified. The k parameter, which characterizes the extent of this attenuation mechanism, is generally difficult to measure, particularly in regions of low and moderate seismicity. Empirical correlation of k with the near-surface shear wave velocity parameter in rock has been developed using global information obtained from limited independent studies. The influence of shaking intensity on the value of k has been found to be negligible in conditions that are consistent with the average seismicity of Australia (as also for other intraplate regions). Thus, adjustment in the value of k to account for variations in earthquake magnitude, or the intensity of ground shaking, has not been recommended for intraplate conditions. In parallel with the empirical correlations, values of k have also been obtained from calibration analyses employing stochastic simulations of the seismological model, along with onedimensional non-linear shear wave analyses of the rock layers. Good agreement in the values of k obtained from the different approaches has been demonstrated. The correlation of k with the near-surface shear wave velocity of rock, as recommended in this paper, has thereby been reaffirmed.
Chandler,A. , Lam,N. , Tsang,H. and Sheikh,M. (2005). Estimation of Near-Surface Attenuation in Bedrock for Analysis of Intraplate Seismic Hazard. Journal of Seismology and Earthquake Engineering, 7(3), 159-173.
MLA
Chandler,A. , , Lam,N. , , Tsang,H. , and Sheikh,M. . "Estimation of Near-Surface Attenuation in Bedrock for Analysis of Intraplate Seismic Hazard", Journal of Seismology and Earthquake Engineering, 7, 3, 2005, 159-173.
HARVARD
Chandler A., Lam N., Tsang H., Sheikh M. (2005). 'Estimation of Near-Surface Attenuation in Bedrock for Analysis of Intraplate Seismic Hazard', Journal of Seismology and Earthquake Engineering, 7(3), pp. 159-173.
CHICAGO
A. Chandler, N. Lam, H. Tsang and M. Sheikh, "Estimation of Near-Surface Attenuation in Bedrock for Analysis of Intraplate Seismic Hazard," Journal of Seismology and Earthquake Engineering, 7 3 (2005): 159-173,
VANCOUVER
Chandler A., Lam N., Tsang H., Sheikh M. Estimation of Near-Surface Attenuation in Bedrock for Analysis of Intraplate Seismic Hazard. J Seismol Earthq Eng, 2005; 7(3): 159-173.