Characterization and Hazard Study of Two Areas of Penang Island, Malaysia

Ali, M. M.; Ahmad, Fauziah; Yahaya, Ahmad Shukri; Farooqi, Mohd Ahmadullah

doi:10.1080/10807039.2011.588156

Cited by 20 publications

(14 citation statements)

References 10 publications

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“…Penang Island is located in the northern part of Peninsular Malaysia. It is centrally occupied by Penang hills of granitic origin, and it is rapidly becoming a major metropolitan city with the influx of tourists and increase in construction and industrial activities leading to expansion and building of infrastructure around the slope area, with a daily maximum high temperature of 35°C, annual average rainfall as high as 647 cm, and daily relative humidity as high as 96.8% in some cases (Ahmad et al, 2006;Ali et al, 2011). These climatic factors are responsible for rapid weathering of the granitic rocks which makes the slope potentially unstable resulting in shallow landslide in Balik Pulau and Paya Terubong axis.…”

Section: Site Selectionmentioning

confidence: 99%

Analysis of Geotechnical-Assisted 2-D Electrical Resistivity Tomography Monitoring of Slope Instability in Residual Soil of Weathered Granitic Basement

2020

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Section: Site Selectionmentioning

confidence: 99%

Analysis of Geotechnical-Assisted 2-D Electrical Resistivity Tomography Monitoring of Slope Instability in Residual Soil of Weathered Granitic Basement

2020

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“…The study area belongs to the South Penang Pluton, which is of late Carboniferous age. It composed of fined grained biotite and medium to coarse-grained biotite granite (Ali et al, 2011; Pradhan and Lee, Geology map of Penang Island modified from (Kong, 1994).…”

Section: Study Area and Geological Settingmentioning

confidence: 99%

Application of microgravity and electrical resistivity imaging techniques to identify ground subsidence prone zone

Mohammed¹

2021

Acta Geodynamica Et Geomaterialia

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Owing to the disastrous consequences of ground subsidence in the urban area, great attention had always been accorded to areas with suspected signs of subsidence occurrence in order to mitigate its effect. Microgravity and electrical resistivity imaging (ERI) survey techniques were conducted at a parking lot of which possible occurrence of subsidence is anticipated due to the increased exposure of surface cracks and very slight depression. This study aimed to map and delineate the subsurface condition of the area with the view of revealing probable subsidence prone zones within the study area. To this end, the microgravity survey data was acquired at a station interval of 2 m. Pole-dipole configuration with 2 m electrode separation was adopted for the electrical resistivity imaging survey. The two methods showed good correlation with each other and proved their effectiveness in imaging the subsurface. A large proportion of the subsurface area was found to be residual soil (mainly silt and or clayey sand) with saturated zones identified by low gravity (< -40.94 mGal) and resistivity (<150 Ω.m) values, which have the tendency to undergo expansion and contraction processes due to rise and fall in moisture content. The subsurface condition was found to be relatively stable, devoid of any subsidence triggering features such as voids or cavities. However, it is inferred to be unsuitable for engineering structures due to the expansive and contractive properties of the subsurface geomaterials (residual soil). Therefore, it is concluded that the area is not prone to subsidence and the surface cracks presents are mere effects of the expansion and contraction process, which could be avoided by the excavation of the expansive soil or good engineering design before the establishment of any structure.

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“…The study area is located in Universiti Sains Malaysia, Penang Island, Malaysia. The area has a tropical climate with temperature ranging from 23.5°C to 31.4°C, average annual rainfall from 2670 mm to 3250 mm, and relative humidity ranging from 60.9 % to 96.8 % (Ali et al, 2011). Geologically, the island is underlain by granitic rock (Figure . 1).…”

Section: Description Of Study Area and Geologymentioning

confidence: 99%

Solution of Collinearity Problem in Two-Dimensional Electrical Resistivity Tomography using Wenner Array

Mohammed¹,

Muztaza²,

Saad³

2021

JST

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Two-dimensional electrical resistivity tomography (2-D ERT) is one of the most common geophysical tools employed to satisfy the ever-growing need for obtaining subsurface information. Most of the conventional electrode arrays used for 2-D ERT survey are built with the theoretical assumption that the survey lines are straight to guarantee four collinear electrodes at every point of measurement. However, due to surface constraint associated with most survey areas, it is rarely possible to conduct a two-dimensional resistivity survey on a straight line. Therefore, 2-D ERT survey conducted on a surface constraint field requires shifting one or more electrodes off the survey line, which contrasts with the underlying assumption. Consequently, the result might be prone to false anomalies. Thus, this study aimed to device a new approach that could mitigate the false anomalies posed by non-collinearity of electrodes in 2-D ERT result. In view of this, ABEM Terrameter SAS4000 using Wenner array configuration was adopted for the survey. The data was acquired with all electrodes inline and one or more electrodes offline at stepwise distances, respectively. Based on the result obtained, the new approach mitigates the offline electrodes effect, as the inverse resistivity tomograms resolves the geometries of the true model reasonably well. More so, it has high R-value >90% which is an indication of proximity to the true model. Hence, it is concluded that the new approach is effective in mitigating offline electrode effect on a 2-D ERT result.

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Characterization and Hazard Study of Two Areas of Penang Island, Malaysia

Cited by 20 publications

References 10 publications

Analysis of Geotechnical-Assisted 2-D Electrical Resistivity Tomography Monitoring of Slope Instability in Residual Soil of Weathered Granitic Basement

Analysis of Geotechnical-Assisted 2-D Electrical Resistivity Tomography Monitoring of Slope Instability in Residual Soil of Weathered Granitic Basement

Application of microgravity and electrical resistivity imaging techniques to identify ground subsidence prone zone

Solution of Collinearity Problem in Two-Dimensional Electrical Resistivity Tomography using Wenner Array

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