Mapping of Subsurface Geological Structure and Land Cover Using Microgravity Techniques for Geography and Geophysic Surveys: A Case Study of Maluri Park, Malaysia

La Ode Nursalam; A Arisona; R Ramli; La Harudu; Sitti Kasmiati; Eko Harianto; Fahrudi Ahwan Ikhsan; Andri Estining Sejati

doi:10.19184/geosi.v4i3.13738

La Ode Nursalam Department of Geography Education, Halu Oleo University, Kendari, Sulawesi Tenggara, 93232, Indonesia
A Arisona Department of Geology Engineering, Halu Oleo University, Kendari, Sulawesi Tenggara, 93232, Indonesia
R Ramli Department of Geography Education, Halu Oleo University, Kendari, Sulawesi Tenggara, 93232, Indonesia
La Harudu Department of Geography Education, Halu Oleo University, Kendari, Sulawesi Tenggara, 93232, Indonesia
Sitti Kasmiati Department of Archeology, Halu Oleo University, Kendari, Sulawesi Tenggara 93232, Indonesia
Eko Harianto Department of Agrobusiness, Kendari Terbuka University, Kendari, Sulawesi Tenggara, 93232, Indonesia
Fahrudi Ahwan Ikhsan Department of Geography Education, Jember University, East Java, 68121, Indonesia
Andri Estining Sejati Department of Geography Education, Sembilanbelas November Kolaka University, Kolaka, Sulawesi Tenggara 93561, Indonesia http://orcid.org/0000-0003-2052-9094

DOI: https://doi.org/10.19184/geosi.v4i3.13738

Abstract

A microgravity investigation on bedrock topography was conducted at Maluri park reference level in Kuala Lumpur, Malaysia. The study aim to mapping the near-surface structure and soil and land cover distribution for geography and geophysics surveys. Two types of cross-section modeling of the residual anomaly generated the MaluriBouguer Anomaly model for site-1 and site-2 at Maluri Park. The 2D microgravity models produced the contour map, displaying the characterization due to density contrast in rock types while mapping the subsurface geological structure at different depths. Moreover, a synthetic model was initiated with the assumption of lateral distance on the left and right sides taken at 50 m and a depth of 60 m. The results of modeling confirmed that the soil and rock type composition on both models site tests are topsoil (1.1 to 1.92 g/cm³), soil (1.8 g/cm³), clay (1.63 g/cm³), gravel (1.7 g/cm³), sand (2.0 g/cm³), shale (2.4 g/cm³), sandstone (2.76 g/cm³), and limestone (2.9 g/cm³). The 2D gravity modeling using two model site tests obtained a correspondence with the observed microgravity data.

Keywords: Bouguer anomaly, limestone, microgravity, soil structure, topography.

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