Shear-wave Velocity Profile for Holocene Sediments Measured from Microtremor Array Studies, SCPT, and Seismic Refraction

Author:

Asten Michael W.12,(Bill) Stephenson W. R.12,Davenport Peter N.12

Affiliation:

1. Centre for Environmental and Geotechnical Applications of Surface Waves (CEGAS), School of Geosciences, Monash University, Melbourne, Victoria, Australia

2. Institute of Geological and Nuclear Sciences (IGNS), Lower Hutt, New Zealand

Abstract

The microtremor method was trialed on soft Holocene sediments overlying glacial gravels near the Hutt River, Wellington New Zealand. A triangular four-station array of radius [Formula: see text], processed using a modified spatial autocorrelation (SPAC) method was sufficient to establish shear velocity for sediments and gravels, and a thickness of [Formula: see text] for the soft sediments. The interpretation was performed blind to geological and geophysical data, and subsequent comparison with seismic cone penetrometer and seismic refraction data shows the accuracy from the SPAC interpretation to be better than 5%. Interpretation of horizontal: vertical spectral ratio data assists with estimates of thickness of the glacial gravels (hundreds of meters) but accuracy in thickness is poor, perhaps due to uncertainty in the 2D nature of the base of the gravel-filled glacial valley.

Publisher

Environmental and Engineering Geophysical Society

Subject

Geophysics,Geotechnical Engineering and Engineering Geology,Environmental Engineering

Reference21 articles.

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2. Asten, M. W. , N. Lam, G. Gibson, and J. Wilson, 2002, Microtremor survey design optimised for application to site amplification and resonance modeling: in Total Risk Management in the Privatised Era, Griffith, M., Love, D., McBean, P., McDougall, A., and Butler, B. (eds.), Proceedings of Conference, Australian Earthquake Engineering Soc., Adelaide, Paper 7.

3. Asten, M. W. , 2004, Passive seismic methods using the micro-tremor wave field for engineering and earthquake site zonation: 74th Annual Meeting of the SEG, Denver, Oct 2004, Session NSG-1.

4. Asten, M. W. , T. Dhu, and N. Lam, 2004, Optimised array design for microtremor array studies applied to site classification; observations, results and future use: Paper 2903, Conference Proceedings of the 13th World Conference of Earthquake Engineering, Vancouver, Aug. 1-6.

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