Subsurface structure of Sumani segment in the Great Sumatran Fault inferred from magnetic and gravity modeling

Amir, Harman; Bijaksana, Satria; Dahrin, Darharta; Nugraha, Andri Dian; Arisbaya, Ilham; Pratama, Aditya; Suryanata, Putu Billy

doi:10.1016/j.tecto.2021.229149

Cited by 4 publications

(15 citation statements)

References 28 publications

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“…On the other hand, the subsurface structure provides the presence of rock types related to the rigidity and geometry/distribution of subsurface rocks related to the geological structure. As reported by Amir et al (2021), subsurface intrusion may be related to earthquake events. Natural disasters depend on the rate of deformation of the ground surface, which depends on the subsurface structure.…”

Section: Introductionmentioning

confidence: 69%

“…Certain areas, especially near the volcanoes, are not accessible due to their terrain. Blue circles are new survey points, while red survey points were from Amir et al (2021).…”

Section: Tectonic Settingmentioning

confidence: 99%

“…The results of the subsurface structure study by Amir et al (2021), based on combined magnetic and gravity data, are important for understanding the earthquake mechanism in the Sumani segment, which is one of the seismically active GSF segments that is located on the border of the Sianok segment. Why is it necessary to study the Sianok subsurface?…”

Section: Introductionmentioning

confidence: 99%

“…A combination of gravity and magnetic methods is commonly used to identify subsurface geological structures (see Zubaidah et al, 2014;Jiang et al, 2017;Araffa et al, 2018;Amir et al, 2021). The combination of gravitational and magnetic data is often used to overcome the problem of lack of data or the presence of non-uniqueness in the solution of the inversion process (Hinze et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…A study using the same method has also been carried out by Araffa et al (2018) in the Sinai Peninsula and identified the main tectonic deformation sites in the study area. Recently, Amir et al (2021) also conducted magnetic and gravitational studies in the Sumani Segment of the Great Sumatran Fault (GSF) and identified the presence of unexposed intrusive bodies in the study area, including under Lake Singkarak. The results of the study by Amir et al (2021) are important for understanding the earthquake mechanism in the Sumani segment, which is one of the seismically active GSF segments.…”

Section: Introductionmentioning

confidence: 99%

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Subsurface structures of Sianok Segment in the GSF (Great Sumatran Fault) inferred from magnetic and gravity modeling

et al. 2022

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Among the 19 segments of the Great Sumatran Fault (GSF), the Sianok segment is unique due to its proximity to active volcanoes as well as to the sizable Maninjau Caldera. Located next to the Sumani to its southeast, the Sianok segment also passes through a relatively densely populated area. To identify potential disasters in the future, it is imperative to understand the subsurface structures of the Sianok segment. In this study, ground magnetic measurements were conducted, and the data were combined with the Bouguer anomaly map. Hand samples were also collected and measured for magnetic susceptibility and density. The values were later used as initial parameters for modeling. Joint forward modeling of magnetic and gravity was then used in the modeling stage as well as in the interpretation stage. Subsurface models of 20 km in depth were then formulated based on the magnetic and gravity data. The models show shallow magma chambers beneath Maninjau Caldera, Mount Marapi, and Mount Singgalang-Tandikat. The models confirm that exposed and unexposed Permian metamorphic rocks are commonly distributed in the Sianok segment. The thickness of volcanic deposits such as tuff and andesites in the Sianok segment were found to be sizable, ranging from 1 km for tuff to 3.5 km for andesites of the Maninjau Caldera.

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Section: Introductionmentioning

confidence: 69%

“…Certain areas, especially near the volcanoes, are not accessible due to their terrain. Blue circles are new survey points, while red survey points were from Amir et al (2021).…”

Section: Tectonic Settingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Subsurface structures of Sianok Segment in the GSF (Great Sumatran Fault) inferred from magnetic and gravity modeling

et al. 2022

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Subsurface structure of Bali Island inferred from magnetic and gravity modeling: new insights into volcanic activity and migration of volcanic centers

Suryanata,

Bijaksana,

Dahrin

et al. 2024

Int J Earth Sci (Geol Rundsch)

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Subsurface Structure of Singkarak Pull Apart Inferred from Magnetic and Gravity Modeling

Amir,

Bijaksana,

Dahrin

et al. 2023

J. Phys.: Conf. Ser.

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The existence of active faults along the Sumatran fault has an impact on tectonic activities such as earthquakes and the formation of pull-apart along the Great Sumatran Fault (GSF). The Great Sumatran Fault is segmented into 19 segments. Fourteen segments of which are pull-apart. One of the pull-apart amongofthe GSF is the Singkarak pull-apart which is located on the Sumani segment. Magnetic and gravitational methods are appropriate geophysical methods used to determine rock structures below the earth’s surface. The subsurface structure of the Singkarak pull-apart analysis needed to identify potential future basins. Based on the analysis of the low magnetic anomaly closures on both sides of Lake Singkarak, this study has also succeeded in identifying the presence of a less dense Quaternary Coluvium volcanic deposition outcrop and concluded that the displacement of about 18± 3 km was resulted from a strike-slip process in the past. Furthermore, Lake Singkarak is estimated to have experienced an opening as far as 8 ±1 km which is based on the maximum width of the model profile that passes through the middle of Lake Singkarak.

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Subsurface structure of Sumani segment in the Great Sumatran Fault inferred from magnetic and gravity modeling

Cited by 4 publications

References 28 publications

Subsurface structures of Sianok Segment in the GSF (Great Sumatran Fault) inferred from magnetic and gravity modeling

Subsurface structures of Sianok Segment in the GSF (Great Sumatran Fault) inferred from magnetic and gravity modeling

Subsurface structure of Bali Island inferred from magnetic and gravity modeling: new insights into volcanic activity and migration of volcanic centers

Subsurface Structure of Singkarak Pull Apart Inferred from Magnetic and Gravity Modeling

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