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Near-surface attenuation modelling based on rock shear-wave velocity profile

Near-surface attenuation modelling based on rock shear-wave velocity profile
Near-surface attenuation modelling based on rock shear-wave velocity profile
In a previous study published in this journal, the authors developed a comprehensive methodology for modelling the shear wave velocity profile in crustal rock, for purposes of seismic hazard assessment. The derived shear wave velocity profile was used to estimate the amplification and attenuation mechanisms in the transmission of seismic waves. The ability to conduct seismic hazard assessments in regions of low and moderate seismicity is greatly enhanced by this new modelling approach, given that developing a local attenuation model based on curve-fitting strong motion data is generally not feasible under such conditions. This paper reports a follow-up study conducted to evaluate the significance of near-surface attenuation in bedrock (as distinct from attenuation in unconsolidated soft soil sediments). The ? parameter is used to characterize the extent of this attenuation mechanism. Empirical correlations of ? with two forms of near-surface shear wave velocity parameter in crustal rock have been developed, employing information obtained from global sources in conjunction with that from local studies. The resulting development of two simple equations to predict median values of ? as functions of readily available shear wave velocity parameters represents the key outcome of this study. Applications of the proposed empirical approaches to determine ? have been provided, taking Hong Kong and Melbourne as case studies to illustrate different aspects of the proposed methodology. Consistency between the results obtained by the two recommended approaches has thereby been demonstrated.
upper-crust, near-surface attenuation, shear wave velocity, kappa
0267-7261
1004-1014
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
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

Chandler, A.M., Lam, N.T.K. and Tsang, H.H. (2006) Near-surface attenuation modelling based on rock shear-wave velocity profile. Soil Dynamics and Earthquake Engineering, 26 (11), 1004-1014. (doi:10.1016/j.soildyn.2006.02.010).

Record type: Article

Abstract

In a previous study published in this journal, the authors developed a comprehensive methodology for modelling the shear wave velocity profile in crustal rock, for purposes of seismic hazard assessment. The derived shear wave velocity profile was used to estimate the amplification and attenuation mechanisms in the transmission of seismic waves. The ability to conduct seismic hazard assessments in regions of low and moderate seismicity is greatly enhanced by this new modelling approach, given that developing a local attenuation model based on curve-fitting strong motion data is generally not feasible under such conditions. This paper reports a follow-up study conducted to evaluate the significance of near-surface attenuation in bedrock (as distinct from attenuation in unconsolidated soft soil sediments). The ? parameter is used to characterize the extent of this attenuation mechanism. Empirical correlations of ? with two forms of near-surface shear wave velocity parameter in crustal rock have been developed, employing information obtained from global sources in conjunction with that from local studies. The resulting development of two simple equations to predict median values of ? as functions of readily available shear wave velocity parameters represents the key outcome of this study. Applications of the proposed empirical approaches to determine ? have been provided, taking Hong Kong and Melbourne as case studies to illustrate different aspects of the proposed methodology. Consistency between the results obtained by the two recommended approaches has thereby been demonstrated.

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More information

Published date: November 2006
Keywords: upper-crust, near-surface attenuation, shear wave velocity, kappa

Identifiers

Local EPrints ID: 53118
URI: http://eprints.soton.ac.uk/id/eprint/53118
ISSN: 0267-7261
PURE UUID: 6b11b0e1-becb-4e24-b418-a97ad7e716c4

Catalogue record

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

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