JOURNAL OF DEGRADED AND MINING LANDS MANAGEMENT Volume 10, Number 3 (April 2023):4445-4456, doi:10.15243/jdmlm.2023.103.4445 ISSN: 2339-076X (p); 2502-2458 (e), www.jdmlm.ub.ac.id Open Access 4445 Research Article The impact of digital elevation models resolution on tectonic activity assessment based on morphotectonic indices: a case study of Seulawah Agam Volcano, Indonesia Muhammad Ronggour Pardamean Siahaan 1* , Emi Sukiyah 1 , Nana Sulaksana 2 , Agus Didit Haryanto 1 1 Department of Geoscience, Faculty of Geological Engineering, Padjadjaran University, Bandung, Indonesia 2 Department of Applied Geology, Faculty of Geological Engineering, Padjadjaran University, Bandung, Indonesia * corresponding author: muhammad19219@mail.unpad.ac.id Abstract Article history: Received 30 October 2022 Accepted 6 January 2023 Published 1 April 2023 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 2 and 455 km (SRTM), as well as 482.8 km 2 and 460.3 km (DEMNAS). The total segments up to the 4 th 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. Keywords: DEMNAS GIS morphotectonic Seulawah Agam SRTM To cite this article: Siahaan, M.R.P., Sukiyah, E., Sulaksana, N. and Haryanto, A.D. 2023. The impact of digital elevation models resolution on tectonic activity assessment based on morphotectonic indices. A study case of Seulawah Agam Volcano, Indonesia. Journal of Degraded and Mining Lands Management 10(3):4445-4456, doi:10.15243/jdmlm.2023.103.4445. Introduction The Seulawah Agam Volcano (SAV) is a stratovolcano-type volcano located on the north side of the island of Sumatra, precisely to the northeast of the Sumatra fault. Stratovolcano type is a very dominant type of volcano in Indonesia, which is more than a hundred; this type is a product of the subduction of continental plates and oceanic plates with very high tectonic intensity and volcanic activity. Therefore, potential hazards due to high tectonic activity are very likely to occur in the area around SAV. The common volcanic hazards are lava flow, ash fall, glowing clouds, direct blasts, lahar (volcanic debris and mudflows), volcanic gases, volcanic earthquakes, ash clouds, landslides and subsidence (Ghosh, 2016). Particularly in SAV, where there has been no tectonic or volcanic activity for two decades, there is a need for research to increase attention and awareness of potential hazards from tectonic and volcanic activity. This study aimed to identify tectonic activity based on geomorphological and GIS analysis based on two