Using gravity fault identification data in Bandung basin

Abdurrahman, Dadi; Santoso, Djoko; Kadir, Wawan Gunawan A.; Dahrin, Darharta; Setianingsih,; Alawiyah, Susanti

doi:10.1063/1.5047347

Cited by 3 publications

(2 citation statements)

References 1 publication

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“…The geophysical method is used to identify the exact location of active subterranean faults. Ground penetrating radar [23], geoelectric method [24], gravity method [25], and HVSR inversion method [26], are several geophysical methods commonly used to detect subsurface structures.…”

Section: Geophysicsmentioning

confidence: 99%

Gravity Modeling to Understand the Subsurface Geology of the Central Part of West Bandung Regency (Citatah Karst Area, Cipatat-Padalarang)

et al. 2023

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Understanding the subsurface system of the central part of West Bandung Regency (including Karst Area), Indonesia, is an important undertaking carried out by geological and geophysical investigations. This research aims to identify geological subsurface features, especially faults,that have an impact on geohazards in the area. To achieve this goal, deep analysis of geology, geomorphology, and geophysical data is conducted. The central part of West Bandung regency is crossed by the Cimandiri Fault, which is located east of the transitional zone between the frontal subduction of Java and the oblique subduction of Sumatra. The preliminary result shows that the active fault has an impact on geohazards (earthquakes and landslides) in the area. Gravity reduction, regional and residual separation, as well as forward modeling with the Pluoff Equation, are all parts of the examination of the gravity data. A second-order polynomial trend surface was subtracted from the entire Bouguer gravity grid to create the residual gravity anomaly map. The amplitudes of the anomalies range from −12 to 8 mGal. The density distribution from the inverse calculation using 4 horizontal line sections (AB, CD, EF, and GH) was set up in the range of −0.3 to +0.3 g/cc. Geological surface markers for the model can be correlated with the information from the Cianjur Sheet geological map. Regional structure is also interpreted in the model to show the main structure of the reverse fault in the study area. HIGHLIGHTS The gravity method using density properties can provide good information about the subsurface karst system Modeling data gravity contributes to an understanding of geological subsurface interpretation Identifying geological subsurface features, especially faults that cause earthquakes and trigger landslides, is part of geohazard mitigation GRAPHICAL ABSTRACT

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Section: Geophysicsmentioning

confidence: 99%

Gravity Modeling to Understand the Subsurface Geology of the Central Part of West Bandung Regency (Citatah Karst Area, Cipatat-Padalarang)

et al. 2023

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“…The mud volcano site is shown to be in the low to high residual anomaly zone. Abdurrahman et al (2018) showed that the low to high residual gravity anomaly pattern is associated with the presence of fault structures due to the density contrast caused by the activity of these structures. The low to high residual anomaly pattern at the mud volcano site is thought to be influenced by active tectonic activity between the Indian Ocean and South Java Island plates.…”

Section: Separation Of Gravity Anomalymentioning

confidence: 99%

Untitled

2023

JSM

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Mud volcanoes, known as mud extrusion phenomenon, is a geological feature that expels suspended fine-grained sedimentary materials and fluids to the surface due to buoyancy and pressure difference. This geological feature is found almost all over the world and formed in compressional tectonic environments, one of which is the Ciuyah Mud Volcano, Kuningan, Indonesia. Previous studies have shown that the appearance of the mud volcano was influenced by tectonic activity that formed a 'hypothetical' fault structure as a pathway for mud migration and extrusion to the surface. Integration of geophysical studies using satellite gravity and geology using fault fracture density analysis was conducted to prove the existence of the 'hypothetical' fault structure. The results show that the mud volcano site is located in a low to high gravity anomaly pattern associated with significant density contrast differentiation followed by the maximum value of FHD and low-high SVD pattern oriented west southwest -east northeast (WSW -ENE). The gravity anomaly pattern can be associated with the presence of faults. This is reinforced by the fault fracture density map which shows that the mud volcano site is located in a medium to high fracture density zone (weak zone) associated with good permeability conditions below the surface. Thus, the research results have proven the existence of a 'hypothetical' fault as the migration and extrusion pathway of Ciuyah Mud Volcano mud that has been studied previously.

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A High Resolution of Terrain Gravity of Bandung Area

Gunawan,

Prasetyo,

Alawiyah

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The Bandung basin spans around 30 km by 60 km and is encircled by mountains. Therefore, the gravity due to terrain variations has significantly contributed to the area’s Complete Bouguer Anomaly (CBA). In this study, we have applied a high resolution of terrain gravity (TG) using the block of rectangular prisms with 100 m x 100 m x 10 m dimensions. The investigation includes up to 70 km x 100 km terrain areas where the data was obtained from the shuttle radar topography mission digital elevation model (SRTM DEM). The results show that the southern region has about 20 mGal TG higher than the northern region due to more and higher mountain variation. Our investigation also found that the reasonable terrain areas included in the calculation must be at least 40 km wider from the outer gravity stations to get less than one mGal change in the 5 km terrain area width change. This result gives a good overview of the terrain effect on gravity calculation and interpretation, especially in the Bandung area.

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Using gravity fault identification data in Bandung basin

Cited by 3 publications

References 1 publication

Gravity Modeling to Understand the Subsurface Geology of the Central Part of West Bandung Regency (Citatah Karst Area, Cipatat-Padalarang)

Gravity Modeling to Understand the Subsurface Geology of the Central Part of West Bandung Regency (Citatah Karst Area, Cipatat-Padalarang)

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A High Resolution of Terrain Gravity of Bandung Area

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