Geomorphic Analysis in Determining Tectonic Activity Affected by Sumatra Fault in Liwa Region and Its Surrounding Area, Lampung, Indonesia

Yudhicara, Yudhicara; Muslim, Dicky; Sudradjat, Adjat

doi:10.17014/ijog.4.3.193-208

Cited by 4 publications

(4 citation statements)

References 10 publications

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“…Goudie (2004) stated that sinuosity mountain front was an index reflecting the balance between erosional forces that tend to cut embayment into a mountain front and the tectonic forces that tended to produce a straight front coincident with an activity range-boundary fault. In addition, Yudhicara et al (2017) stated that the intensive uplift was indicated by a low S mf value. Given mountain fronts which associate with active tectonics are straight; they have low values of S mf .…”

Section: Valley Floor Width To Valley Height Ratio (V F )mentioning

confidence: 99%

Morphotectonics of Mount Rendingan Area Related To the Appearances of Geothermal Surface Manifestations

Gentana

Sulaksana

Sukiyah

et al. 2019

Indonesian J. Geosci.

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The researched area is situated at Mount Rendingan and its surrounding area, Lampung Province, the southern part of Sumatra Island. It has a big potential of geothermal resource in line with a unique graben like bowl landform and geothermal surface manifestations. This research was carried out using remote sensing and field observation methods. The remote sensing method used topography and Shuttle Radar Topography Mission-Digital Elevation Model (SRTM-DEM) maps to analyze morphotectonic attributes, and the result was validated by morphotectonic data analysis from field observation. The purpose of this research is to evaluate the relation between morphotectonic and the appearances of geothermal surface manifestations. The interpretation of SRTM-DEM and topographic maps are supported by morphotectonic analyses,which indicate that the geothermal surface manifestations in this area are controlled by tectonic activity. It has various levels of lift which are shown by the values of valley height weight ratio (V f) from 0.16 to 3.31 and the values of mountain front sinuosity (S mf) from 1.05 to 2.09. The morphotectonic characteristics can describe the geological structure activity levels which are reflected in the landform and its rock. The volcanic areas consist of igneous rocks which have small primary permeabilities. However, the development of geological structure can cause fractures in the rock that step in as a medium for passing geothermal fluid from depth to surface. They are found on the fault intersection zone system trending NE-SW and NW-SE, NNE-SSW and NNW-SSE, and WE system directions that indicate the fault system is correlated with the appearances of geothermal manifestations.

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Section: Valley Floor Width To Valley Height Ratio (V F )mentioning

confidence: 99%

Morphotectonics of Mount Rendingan Area Related To the Appearances of Geothermal Surface Manifestations

Gentana

Sulaksana

Sukiyah

et al. 2019

Indonesian J. Geosci.

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“…From geomorphological perspective, the research area is classified as part of the Barisan Mountains, characterized by the morphology of wavy hills and lowlands, which are influenced by tectonic activity (Mangga et al, 1993;Yudhicara et al, 2017;Radityo et al, 2020). Based on the Regional Geological Map of Tanjungkarang (Mangga et al, 1993), the research area consists of several rock formation units, namely Tarahan Formation (Tpot), Lampung Formation (QTl), and Betung Young Volcanic Deposit (Qhv (b)) which are dominated by Tertiary to Quaternary volcanic products.…”

Section: Introductionmentioning

confidence: 99%

Identification of Saltwater Intrusion Distribution in North Padang Cermin Area, Lampung, Indonesia

Alviyanda,

Anjar Dwi Asterina,

Redhatul Irma

2023

J. Geoscience Eng. Environ. Technol.

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The residential areas of North Padang Cermin are mainly located near the coastal area with a high level of groundwater use. Continuous groundwater use could potentially raise saltwater intrusion and lead to a decrease in groundwater quality. The research is conducted to identify the saltwater intrusion spread based on groundwater quality data. Geological observations were carried out to determine the geological conditions of the research area, followed by qualitative and quantitative hydrogeological observations by measuring TDS (Total Dissolved Solid), EC (Electrical Conductivity), pH, temperature, color, and taste. The Herzberg method was used to identify freshwater thickness against seawater intrusion. Hydrogeologically, the research area has four aquifer systems: aquifers with fissure and intergranular flow, aquifers with intergranular flow and wide-distribution productivity, aquifers with fissure and intergranular flow and local distribution, and aquifers with rare groundwater. Groundwater flow has a radial pattern with the most extensive hydraulic gradient with a value of 0.16 m towards the eastern part of the research area. The indications of seawater intrusion were found in the water samples measurement located on the east of the research area with water type of brackish–salty with a TDS value of 1,443 – 3,790 ppm and an EC of 3,000 – 7,580 (μS). Based on the Herzberg method, the distribution of seawater intrusion is estimated to occur at a depth of 36.8 m.

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“…Landscape and spatial data are very important for studying active tectonics because they can estimate the exact position and historical seismic records (Arrowsmith & Zielke, 2009). Tectonic geomorphological analysis has been widely used as a parameter to measure earthquake hazard in an area (Galadini and Galli, 2000;Faghih et al, 2015;Keller and Pinter, 1996;El Hamdouni et al, 2008;Yudhicara et al, 2017;Hidayat, 2010). Large landforms of the Earth's surface resulting from the competition between uplift and denudation processes were studied (Burbank and Anderson, 2001).…”

Section: Introductionmentioning

confidence: 99%

Tectonic Geomorphology of the Karangsambung Area, Central Java, Indonesia

Hidayat

Muslim

Zakaria

et al. 2021

MGPB

Self Cite

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Karangsambung, located in Central Java, Indonesia has complex geological conditions of the tectonic evolution of Java Island due to the subduction process of the India-Australia plate with the Eurasian plate in the Cretaceous-Paleocene. The tectonic movements in the subduction zone have resulted in diverse geological structures and rock types and impact the morphological shape of the study area. The level of tectonic activity in the study area can be determined using a tectonic geomorphological approach. A digital elevation model and geographic information systems are used for geomorphic data processing. Geological data observations were also carried out in the form of river terraces. Seven geomorphic index parameters have been calculated to determine the youngest tectonic activity through the relative tectonic activity index (IAT) of the study area: the ratio of the valley floor width to the valley height, the drainage basin asymmetry, the river gradient-length index, the basin shape index, mountain front sinuosity, drainage density, and the hypsometric integral/hypsometric curve. The IAT score is divided into four classes which are class 1 (0%) very highly, class 2 (13%) highly, class 3 (56%) moderately, and class 4 (31%) low. The IAT shows that the research area is categorized as an active tectonic area so that the morphology formed is more influenced by tectonic activity than erosion. Geological data analysis on uplifted and deformed river terrace outcrops shows that the study area is affected by neotectonic activity.

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Geomorphic Analysis in Determining Tectonic Activity Affected by Sumatra Fault in Liwa Region and Its Surrounding Area, Lampung, Indonesia

Cited by 4 publications

References 10 publications

Morphotectonics of Mount Rendingan Area Related To the Appearances of Geothermal Surface Manifestations

Morphotectonics of Mount Rendingan Area Related To the Appearances of Geothermal Surface Manifestations

Identification of Saltwater Intrusion Distribution in North Padang Cermin Area, Lampung, Indonesia

Tectonic Geomorphology of the Karangsambung Area, Central Java, Indonesia

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