Fig 4 - uploaded by Muhammad Ronggour Pardamean Siahaan
Content may be subject to copyright.
Yellow color shows weak tectonic zones classified by < 3 variables, pink is moderate tectonic zones classified by three variables and red color shows active tectonic zones classified by > 3 variables.
Context in source publication
Context 1
... W-20, W-21, W-23, W-35, W-36 and W-37) as weak tectonic zones ( Table 7). The dominant active tectonic zones (red color) are related to the Seulimeum-fault and minor faults. The moderate tectonic zones (pink color) are related to the Ie Su'um (hot spring) manifestation and the weak tectonic zones (yellow color) are related to several minor faults (Fig. ...
Citations
... The digital elevation model (DEM) data was leveraged to collect the high spatial resolution database of the seamless digital elevation model (DEM) and Batimetri Nasional Indonesia (DEMNAS). In addition, this study site was the focus of an examination of the geological model of Plawangan Hill using DEMNAS data (30 mresolution) and the 1984 World Geodetic System's projected Universal Transverse Mercator (UTM) Zone 46 North coordinate system (Siahaan et al., 2022). Following the fundamental morphologic types, elevation and slope are ordered from low to high altitudes, such as low and high altitudes. ...
Mount Merapi National Park (TNGM) is one of the active volcanos in Indonesia. It has past volcano eruption history since 1911 up to date. Specifically, Plawangan Hill is a part of the TNGM recently designated as Geo-heritage and has experienced volcano eruption indirectly and directly. Additionally, since the Indonesian government designates Plawangan Hill as a Geological Heritage (Geo-Heritage) location, it is crucial to determine its geological features and how they relate to the development of the vegetation there as the study’s objectives. A field survey and a soil laboratory examination were conducted to obtain the data. As a result, Plawangan Hill’s DEM was classified from very low to very high classes, while the DSM was categorized from flat to very steep slopes. Further, the results demonstrated that the pH of the soil was typically somewhat acidic (5.93–6.54). While the soil’s nitrogen content was found to be low to medium, both phosphorus and potassium levels were typically very low. The carbon-nitrogen ratio was generally categorized into the medium, while the organic C ranged from low to medium (1.44% to 3.22%). The soil’s N total, K total, organic matter, carbon content, and C-N ratio increased by the erupted material age. Additionally, it was discovered that the vegetation growth was excellent in indirect (IA) and directly affected (DA) conditions, as indicated by their diameter at breast height (Dbh) and height (H). The correlation between soil characteristics and vegetation growth differed in indirectly affected (IA) and directly affected (DA) areas. As a result, the study found that volcanic materials significantly contributed to Plawangan Hill’s soil characteristics and vegetation growth. Furthermore, this study’s findings were highly beneficial because they were one of the primary explanations for why Plawangan Hill was designated a Geo-heritage site.
... Geomorphological studies such as morphometric, morphotectonic, and morphstructure analyses can identify zones of tectonic activity and the presence of structures as well as surface morphological conditions with certain classifications related to volcanic systems Riswandi et al., 2020;Siahaan et al., 2022). Morphometric analysis has been widely used as a technique for identifying young mountains, which has been proven to develop geomorphic features Riswandi et al., 2020;Siahaan et al., 2022). ...
... Geomorphological studies such as morphometric, morphotectonic, and morphstructure analyses can identify zones of tectonic activity and the presence of structures as well as surface morphological conditions with certain classifications related to volcanic systems Riswandi et al., 2020;Siahaan et al., 2022). Morphometric analysis has been widely used as a technique for identifying young mountains, which has been proven to develop geomorphic features Riswandi et al., 2020;Siahaan et al., 2022). On the other hand, morphometric and morhotectonic indications are influenced by the condition of the Earth's surface, the shape, stream dimensions, elevation, and surface relief. ...
... Based on the classification of Dd, Rb, Rc, Bs, and Vf, the existence of an active tectonic zone can be confirmed (Sharma et al., 2017;Sukiyah et al., 2018). Important geomorphic indices that define landforms undergoing active deformation and provide information on active tectonic zones can be derived through coarse analysis of topographic maps, aerial photographs, satellite images, and quantification of morphotectonic features Riswandi et al., 2020;Siahaan et al., 2022). DEM resolution will greatly affect the raw data to be worked on due to the importance of geomorphological index results. ...
The Digital Elevation Number (DEM) is the main tool for quantitative geomorphological tests. Furthermore, Shuttle Radar Topography Mission (SRTM) images with a resolution of 30 m have been widely used as a source of DEM data in geomorphological studies, while DEMNAS (National DEM) images with 8 m are rarely used. Both images can identify typical volcanic morphology based on a visual comparison of hillshade with certain variations in slope. The objective of this study was to determine the feasibility of DEM for tectonic activity assessment based on morphotectonic indices. In this study, geomorphological comparisons were carried out on twelve watersheds in the Seulawah Agam Volcano (SAV). The data extraction of DEM resulted in the total area and perimeter, namely 486.8 km<sup>2</sup> and 455 km (SRTM), as well as 482.8 km<sup>2</sup> and 460.3 km (DEMNAS). The total segments up to the 4<sup>th</sup> order and the resulting lengths were 290 and 512.8 km for SRTM, while DEMNAS were 527 and 711.7 km. The morphotectonic variables used included drainage density, bifurcation, circularity, and valley floor ratio, as well as basin shape index. The results of these parameter calculations using mean values of SRTM imagery showed very coarse textures, deformed, more elongated, moderate tectonic, and low uplift. On the other hand, those of DEMNAS imagery showed coarse textures, not-deformed, more elongated, low tectonic, and low uplift of the basin’s characteristics.
Geology of sedimentary rift-basins require strong geomorphic input for a proper interpretation of active tectonics. Rift-related sedimentation took place in western Rajasthan of the Indian shield, which includes the Bikaner-Nagaur basin (BNB) and a few other adjacent basins. The sedimentation history of the BNB includes Proterozoic, Cambrian, Permo-Carboniferous and from Paleocene to the Recent. This study analyses river profiles with the best-fit curve (R 2) model for the BNB and the surrounding regions. The research shows that the watershed 3 within the study area is most active tectonically, through which multiple faults and lineaments pass. Hypsometric Curves (HCs) of watersheds 1, 2 and 3 indicate that these watersheds are tectonically active. This inference is based on the concave profiles of HCs at the head, and convex profiles of HCs at the body and toe sections. Clustering of sixty segments (S) of the considered rivers based on linear-scale morphometric parameters, e.g., sinuosity index (SI), stream length gradient index (SL) and concavity (θ θ θ θ θ) enabled segment-wise comparison of river profiles with similar values. These segments were compared pair-wise, and Euclidean-based dissimilarity (d R) values were calculated between each such pair. The findings too imply that tectonic activeness exists in parts of watersheds 1, 2 and 3. The channel flow lines are controlled by faults/lineaments as per the micro-scale examination of the drainage network and faults/ lineaments analysis. Under structural control, nine major geomorphic units emerged with distinct erosional surfaces, denudational hillocks, dissected hills and inselbergs. Detailed geomorphic map with micro-scale studies revealed a slope retreat process that resulted in landforms viz., pediment, pediment slope and active flood plains.
