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Estimation of near-surface attenuation in bedrock for analysis of intraplate seismic hazard

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posted on 2024-11-14, 02:08 authored by A M Chandler, N T Lam, H H Tsang, Md Neaz SheikhMd Neaz Sheikh
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.

History

Citation

This article was originally published as Chandler, A, Lam, N, Tsang, H & Sheikh, MN, Estimation of near-surface attenuation in bedrock for analysis of intraplate seismic hazard, Journal of Seismology and Earthquake Engineering, 7(3), 2005, 159-173.

Journal title

Journal of Seismology and Earthquake Engineering

Volume

7

Issue

3

Pagination

159-173

Language

English

RIS ID

20003

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