Estimation of near-surface attenuation in bedrock for analysis of intraplate seismic hazard
Chandler, A.M., Lam, N.T.K., Tsang, H.H. and Sheikh, M.N. (2005) Estimation of near-surface attenuation in bedrock for analysis of intraplate seismic hazard. Journal of Seismology and Earthquake Engineering, 7, (3), 159-173.
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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.
|Subjects:||Q Science > QE Geology
T Technology > TA Engineering (General). Civil engineering (General)
|Divisions:||University Structure - Pre August 2011 > School of Civil Engineering and the Environment
|Date Deposited:||18 Jul 2008|
|Last Modified:||02 Mar 2012 11:50|
|Contributors:||Chandler, A.M. (Author)
Lam, N.T.K. (Author)
Tsang, H.H. (Author)
Sheikh, M.N. (Author)
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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