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

Estimation of near-surface attenuation in bedrock for analysis of intraplate seismic hazard
Estimation of near-surface attenuation in bedrock for analysis of intraplate seismic hazard
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.
1735-1669
159-173
Chandler, A.M.
65e06f78-0c92-4ee9-9222-24397b4869f7
Lam, N.T.K.
9edc6f4d-887a-4870-b4fb-713ffb9ee0b7
Tsang, H.H.
07092d7e-bb19-4374-ba6a-f33ccb5ee6da
Sheikh, M.N.
aae4a44f-c8d1-453c-8206-b746df5034a9
Chandler, A.M.
65e06f78-0c92-4ee9-9222-24397b4869f7
Lam, N.T.K.
9edc6f4d-887a-4870-b4fb-713ffb9ee0b7
Tsang, H.H.
07092d7e-bb19-4374-ba6a-f33ccb5ee6da
Sheikh, M.N.
aae4a44f-c8d1-453c-8206-b746df5034a9

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.

Record type: Article

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.

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Published date: 2005

Identifiers

Local EPrints ID: 53123
URI: https://eprints.soton.ac.uk/id/eprint/53123
ISSN: 1735-1669
PURE UUID: 6bdc788c-3147-45e1-b0af-a510b6a7ca1a

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Date deposited: 18 Jul 2008
Last modified: 13 Mar 2019 20:41

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