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| 91 |
Solid Earth Sciences |
ABS-17 |
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Spatio Temporal of Recent Land Subsidence in Jakarta
Heri Andreas, Dina A. Sarsito, Hasanuddin Z. Abidin, Dhota Pradipta, Angga Trysa Yuherdha
Institute of Technology Bandung
Abstract
Land subsidence in a certain area is very dynamic, both spatially and temporally. Spatially, it means how widely land subsidence occurs and where it occurs. Meanwhile, temporally it means when it occurs, whether the subsidence rate is extreme or small. This dynamic behavior will determine the impact of the disaster and disaster management efforts. For example, if we found the extreme rate of land subsidence on the coast, in this case they will cause some coastal areas to become lower than sea level through times and coastal inundation will occurred. Another example is when one place has a higher subsidence rate than its neighbors, it will cause differential subsidence which further causes some damage to infrastructure. The impact from both conditions of extreme rates and differential subsidence of course must be managed well. If we see Jakarta area, the city is recorded experiencing land subsidence very serious with the impact already being a disaster, especially in the form of coastal inundation and wider expansion of fluvial floods. Spatially, areas that are experiencing significant of subsidence are the coastal areas. Meanwhile, it was recorded that in the mid to late 2000s the rate of land subsidence was very significant in many places, with some even reached 26 cm/year. As mentioned above, the dynamic spatio-temporal behavior of subsidence will determine the impact of a disaster and its management efforts. For this reason, it is very important to look at the spatio and temporal of recent subsidence in Jakarta. This paper will explore it. From the results of the data analysis, it is shown that in general the rate of subsidence in Jakarta is slowing while on the one hand, spatially there is a growth in subsidence in buffer areas of the city such as Tanggerang and Bekasi. This situation shows good news for Jakarta but bad news for the buffer area.
Keywords: Land subsidence, spatio, temporal, recent, Jakarta
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| Corresponding Author (Heri Andreas Ardiani)
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| 92 |
Solid Earth Sciences |
ABS-19 |
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Influence of continental crust in the magmatic process in the Sunda - Tangkubanperahu Volcanic Complex, West Java, Indonesia
Keisha Prillia Qayyima (a*), I G.B. Eddy Sucipta (b), Kurnaemi Fadelia Hasan (c), Idham Andri Kurniawan (b), Mirzam Abdurrachman (b), Asep Saepuloh (b), Very Susanto (b), Muhammad Rais Abdillah (d)
a) Department of Geological Engineering, Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung 40132, Indonesia
* keishapq[at]hotmail.com
b) Petrology, Volcanology, and Geochemistry Research Group, Department of Geological Engineering, Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung 40132, Indonesia
c) Laboratory of SEM-EDS UPP Chevron, Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung 40132, Indonesia
d) Atmospheric Science Research Group, Department of Meteorology, Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung 40132, Indonesia
Abstract
The Sunda Arc may possibly be one of the most complex volcanic systems in the world. While it is thought to result from the convergence between the Indo-Australian Plate and the Eurasian Plate, the understanding of the characteristics of the underlying crust, however, is still an enigma. This research was carried out to comprehend the characteristics of this arc. One of the volcanoes comprising this arc is the Sunda - Tangkubanperahu Volcanic Complex, in West Java. This volcanic complex consists of Sunda Volcano, Bukittunggul - Manglayang Cone Complex, and Tangkubanperahu Volcano. Analyses of the lava showed medium to high K calc-alkaline affinity in SiO2 vs. K2O diagram, but generally tholeiitic in SiO2 vs. FeO*/MgO diagram. The difference in affinity is due to the relative Fe enrichment in the majority of the samples, most notably in the Tangkubanperahu Volcano products. The abundance of K is accompanied by the enrichment of other incompatible elements such as Sr, Rb, Ba, Th, and Ce, also depletion in Ta, Nb, Zr, Hf, Ti, Y, and Yb, using MORB as a standard. These geochemical signatures indicate a possible (continental) crustal contamination during the magmatic processes. Other tectonic setting classifications using trace elements support that this volcanic complex is an active continental margin. The primary magmatic source is the melting of the oceanic crust of the Indo-Australian Plate, followed by a crustal contamination (continental crust fragment) during its activity. The parent magma undergoes three distinct differentiation processes, with a magma mixing playing a significant role before eruption.
Keywords: Sunda - Tangkubanperahu Volcanic Complex- magmatic process- crustal contamination
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| Corresponding Author (Keisha Prillia Qayyima)
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| 93 |
Solid Earth Sciences |
ABS-21 |
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The Principal Stress Analysis of Matano Fault From Focal Mechanism Inversion
Asyer Octhav (a*), David P. Sahara (b), Dian Kusumawati (b)
a) Magister of Earth Science, Faculty of Earth Science and Technology, Institut Teknologi Bandung, Indonesia
b) Global Geophysics Research Group, Faculty of Mining and Petroleum Engineering, Institut Teknologi Bandung, Indonesia
Abstract
The Matano Fault is an active left lateral strike slip fault located in Sulawesi as continuation segment of the Palu Koro Fault that separate Makassar Block from the North Sula Block. Many published studies revealed that the focal mechanism parameter can be used as useful information to estimate the principal stress orientation of an existing fault. We utilized the new moment tensor catalogue of Sulawesi which were produced from waveform inversion. We selected twenty five good waveform fitting solution. The solution composed of shallow earthquakes from 2009 to 2018 at Matano Fault and adjacent regions. We used the mechanism solution as input data in stress inversion method to calculate its principal stress orientation using STRESSINVERSE iterative code. The result of the inversion in PT axes shows that the maximum horizontal principal stress (\sigma1) of Matano Fault is 256.87 \pm 1.65 degrees, which has nearly westward direction that give a sufficient force along the fault plane and generate the left lateral strike slip fault, confirmed by the principal stress orientation vector of Matano Fault and adjacent regions from World Stress Map database. The result accuracy is well resolved through jackknife resampling method. Detailed analysis will be needed to understand the characteristics of stress field and its potential to generate a significant earthquake in the future.
Keywords: principal stress, focal mechanism, Matano Fault
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| Corresponding Author (Asyer Octhav)
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| 94 |
Solid Earth Sciences |
ABS-47 |
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Development of Groundwater Conceptual Model for Regional Groundwater Numerical Model
Nanda Rinaldi, Herdy Lukito, Taufiq Hadi Ramadhan, Lilik Eko Widodo, Rusmawan Sumarwan
Teknik Air Tanah, Fakultas Ilmu dan Teknologi Kebumian, Institut Teknologi Bandung
Abstract
This paper outlines the development of a conceptual groundwater model for a mountainous karstic region in the highlands of Papua Island. The model focuses on springs located at the base of an alpine karst system, where groundwater flow is significantly influenced by high recharge rates from rainfall and follows the regional topography in an unconfined manner. By incorporating geological, hydrological, and climatic data specific to the study area, the model elucidates the relationships between recharge processes, groundwater flow dynamics, and spring discharge patterns. The aim is to capture the complex interplay of topography and rainfall on groundwater behavior in this unique karst landscape. This conceptual framework serves as a foundation for further empirical studies and quantitative analyses, contributing to improved water resource management and a deeper understanding of the region^s hydrological characteristics. A Numerical groundwater model also has been developed under the understanding of the conceptual model.
Keywords: Groundwater Model, Conceptual Model, Alpine Karst Mountainous Region
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| Corresponding Author (Nanda Rinaldi)
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| 95 |
Solid Earth Sciences |
ABS-67 |
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Subsurface Resistivity Tomography Images of Some Aquifers and Minor Faults near Cimandiri and Lembang Regional Faults
Please Just Try toRahmi Elzulfiah1*, Bagus Endar B. Nurhandoko1, Wisnu A. Guntara2, Insan R. Komara2, Ratih Pertiwi2, and Maria Cindrawati2 Submit This Sample Abstract
1 Department of Physics, Institute of Technology Bandung, Bandung, Indonesia
2 Institute for Innovation and Entrepreneurship Development (LPIK) ITB, Bandung, Indonesia
Abstract
We investigated the typical subsurface characteristics of some minor faults that may be strongly impacted by the activity of the Cimandiri and Lembang regional faults. The area near these active regional faults is typically rich in fractures and cracks induced by tectonic stress. These fractures and cracks play an important role in groundwater storage and movement. The fractures and cracks surrounding the faults have created high-permeability zones, which facilitate groundwater flow. This study aims to characterize the subsurface conditions in several regions around the Cimandiri-Lembang fault system, particularly in hardrock environments such as paleo-carbonate or volcanic rocks, using 2D resistivity tomography imaging. We present images of the resistivity tomography data that reveal typical geological features and aquifers formed by fractures and cracks influenced by the Cimandiri-Lembang regional faults in West Java. Our findings highlight the significance of tectonic activity in shaping subsurface hydrology, providing critical insights for groundwater management and its potential exploration in fault-affected regions.
Keywords: Cimandiri-Lembang regional fault, hardrock environments, carbonate or volcanic rocks, Resistivity Tomography
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| Corresponding Author (RAHMI ELZULFIAH)
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| 96 |
Solid Earth Sciences |
ABS-88 |
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Quantitative Geomorphosite Analysis of Ranah Minang Silokek Geopark
Moh Fadhly Rizki Yazid (a*), Muhammad Bahrun Najah (a), Mirzam Abdurrachman (a), Idham Andri Kurniawan (a)
(a) Department of Geology Engineering, Faculty of Earth Science and Technology, Institut Teknologi Bandung, Jalan Ganesa No.10, Coblong, Bandung, 40132.
Abstract
The unique geological condition of Ranah Minang Silokek Geopark (RMSG) is the main reason for its designation as a geopark. RMSG, covering an area of 3,131 km2, has a long history of geological processes which begin from Carboniferous Period to Tertiary Period. The long geological history of RMSG is represented by 14 geosites found in this area. Studies about the geodiveristy of these geosites have been conducted by several researchers. However, the geosites eligibility assessment in this area has not been conducted specifically which is important to support RMSG becoming UNESCO Global Geopark (UGG). Thus, this research is aimed to determine the eligibility of RMSG as a geopark using a geomorphosite assessment method. In this research, the geomorphosite assessment will use five values as parameters which consist of scientific and intrinsic values, educational values, economical values, conservation values, and added values. Those parameters will be applied in each geosites in the RMSG area and the results will be in the percentage format. Then, the value of the geosite will be determined by the average results of the five parameters. Based on the assessment, a total of thirteen geosites have the value above 50%, while one geosite acquired below 50%. Despite gaining more than 50% value, most of the geosites have a low economic values parameter which is below 40%. Improvements of accessibility and amenities are necessary to be done in order to increase eligibility of RMSG as a sustainable geopark.
Keywords: geopark, RMSG, geosites, geomorphosite assessment, economic value.
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| Corresponding Author (Moh Fadhly Rizki Yazid)
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| 97 |
Solid Earth Sciences |
ABS-95 |
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IDENTIFICATION OF BARIBIS FAULT SEGMENT IN UJUNGJAYA AREA THROUGH A GEOMORPHOLOGICAL AND MORPHOTECTONIC APPROACH
CIRIA HUMANIS BRILIAN 1, GALIH AJI MAHENDRA 1, ASTYKA PAMUMPUNI 2, IMAM ACHMAD SADISUN 2
1. Environmental Geology and Hydrogeology Laboratory, Padjadjaran University (UNPAD),
2. Geological Engineering Study Program, Faculty of Earth Sciences and Technology, Bandung Institute of Technology (ITB)
Abstract
Baribis Fault is one of the active faults in Indonesia with a reverse movement which extending from Majalengka to Subang and suspected even to Jakarta. Baribis Fault is the northern part of back arc imbrication in West Java. Several studies have been carried out regarding the geometry of the Baribis Fault. However, not many studies have examined the exact location of the Baribis Fault segment. Therefore, it is very interesting to study the exact location of the Baribis Fault segment using a geomorphological and morphotectonic approach. The aim of this research is to determine the location of the Baribis Fault segment which extends in the Ujungjaya area and its surroundings, Sumedang Regency, West Java. The data used in this research is DEMNAS data with a resolution of 8 meters. This research consists of two stages, namely the stage of analyzing the exact location of the Baribis Fault and field validation. The first stage is identifying the location of the Baribis Fault segment in the research area. Identification of the location of faults is carried out using a geomorphological approach consisting of geomorphological analysis, density of geological structure lineaments, and identification of knickpoints. Meanwhile, the second stage is field identification to look for evidence of fault geological structures at the location of the Baribis Fault segment that has been identified in the first stage. Based on geomorphological analysis, lineament density, and identification of knickpoints, it was found that the location of the Baribis Fault segment in the research area is at initial coordinates 107 56 45,5 E and 6 38 14,2 S which extends eastward to coordinates 108 5 40,2 E and 6 43 16,7 S. The Baribis Fault segment has a length of 20,06 km which extends from the west to the east of the study area. Several further studies need to be carried out regarding its activity and the hazards it can cause.
Keywords: Baribis Fault, geomorphology, knickpoint, morphotectonic
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| Corresponding Author (CIRIA HUMANIS BRILIAN)
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