Application of gravity survey for geological mapping and cavity detection: Malaysian case studies

Abd Rahim Bin Harun, Abdul Rahim Samsudin

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

The gravity method is one of the geophysical tools used for geological, engineering and environmental investigations where the detection of geological boundaries, cavities, subsurface karstic features, subsoil irregularities, or landfills is essential. Successfully delineation of geological boundary of Bukit Arang Tertiary Basin in the east of Perlis and north of Kedah illustrates its usefulness as an efficient geological mapping tool. In higher accuracy measurements, the microgravity method has been widely and successfully used for locating and monitoring subsurface voids. Since microgravity methods measure gravity variations at the surface, they are directly influenced by the density distribution in the subsurface and particularly by the presence of voids, which create a mass deficit relative to the density of the surrounding terrain. In many cases, deep or small-scale heterogeneities generating low-amplitude anomalies can be detected and the reliability of further interpretation requires highly accurate measurements which are carefully corrected for any quantifiable disturbing effects. Most of the microgravity surveys in Malaysia were carried out by the Mineral and Geoscience Department mainly to detect the occurrence of subsurface cavities in limestone areas of Klang Valley in Federal Territory and Kinta Valley in Perak. Results of the sinkholes occurrences studies at the sites of a proposed public library building in Baling, Kedah and at the compound of the KTM Quarters, Ipoh, Perak showed that the low amplitude of gravity values located exactly or slightly adjacent to the sinkhole positions. Good correlation of borehole data with several results of microgravity survey such as at Mahkota Wira Condominum site, Jalan Sultan Azlan Shah, Ipoh, Perak and at the proposed Light Rail Transit Station in Jalan Ampang, Kuala Lumpur showed that the cavity location can be successfully determined by the microgravity measurement technique. Although the gravity method can be used successfully in locating the subsurface targets but it's still a non-unique interpretation and the results need to be confirmed either by drilling or by other geophysical methods.

Original languageEnglish
Pages (from-to)8247-8259
Number of pages13
JournalElectronic Journal of Geotechnical Engineering
Volume19
Issue numberX
Publication statusPublished - 2014

Fingerprint

gravity survey
geological mapping
Microgravity
Gravitation
cavity
gravity
sinkhole
void
valley
Light rail transit
geophysical method
subsoil
landfill
Land fill
Boreholes
Limestone
borehole
drilling
limestone
Drilling

Keywords

  • Cavity detection
  • Geological mapping
  • Gravity survey
  • Malaysian case studies

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology

Cite this

Application of gravity survey for geological mapping and cavity detection : Malaysian case studies. / Harun, Abd Rahim Bin; Samsudin, Abdul Rahim.

In: Electronic Journal of Geotechnical Engineering, Vol. 19, No. X, 2014, p. 8247-8259.

Research output: Contribution to journalArticle

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