Geophysical characterization of variable limestone terrains

Tristan Campbell

doi:10.1071/ASEG2007ab017

ISSN: 2202-0586
E-ISSN:

oa Geophysical characterization of variable limestone terrains
Authors Tristan Campbell^a
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^a Geoforce Pty Ltd, 1/288 Victoria Rd, Malaga, WA, , Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab017
- Published online: 01 Dec 2007

Abstract

Summary

Between November 2005 and October 2006, a series of geophysical surveys were conducted over newly released industrial lots in the Australian Marine Complex (AMC) in Henderson. The objective of the surveys was to characterise the subsurface geology as preliminary geotechnical investigations of the site showed this to be highly variable.

Primarily through the use of GPR, with some additional ERI and MASW testing, we were able to successfully delineate the depth to limestone rock head, location of limestone pinnacles and thickness of gravelly fill layers where present over the site. This information was used in the geotechnical assessment of the sites and subsequent planning of earthworks to ensure the sites were developed to the required geotechnical standards.

GPR using shielded 250MHz antennas was found to be the most effective method to characterise the subsurface (at 50MHz the GPR had insufficient resolution), MASW effectively imaged the depth to rockhead and variations within the limestone and ERI imaged hydrogeological variations.

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2007-12-01

2026-01-23

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References

Loke, M.H., Ackworth, I., Dahlin, T., 2003, A comparison of smooth and blocky inversion methods in 2D electrical imaging surveys: Exploration Geophysics, 34, 182-187.
O’Neill, A., Dentith, M., and List, R., 2003, Full-waveform PSV reflectivity inversion of surface waves for shallow engineering applications: Exploration Geophysics, 34, 158 – 173.
Wedepohl, E., 2004, Cavity investigations – a serious business. Investigating the Australian marine complex in Western Australia: Presented at 16th International Geophysical Conference and Exhibition, ASEG.

/content/journals/10.1071/ASEG2007ab017

Article Type: Research Article

Keyword(s): ERI; GPR; limestone; MASW

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oa Geophysical characterization of variable limestone terrains

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