Morphometric Assessment and Tectonic Stress Orientation of Mount Dempo, South Sumatra, Indonesia

Bimantara Panca Utama; Refrizon; Arif Ismul Hadi; Nanang Sugianto; Dadin Mars Abimayu; Naela Sahada Salsabila; Adrian Daniel

doi:10.23960/jgrs.ft.unila.517

Bimantara Panca Utama Geophysics Program, Faculty of Mathematics and Natural Science, University of Bengkulu
Refrizon Geophysics Program, Faculty of Mathematics and Natural Science, University of Bengkulu
Arif Ismul Hadi Geophysics Program, Faculty of Mathematics and Natural Science, University of Bengkulu
Nanang Sugianto Geophysics program, Faculty of Mathematics and Natural Science, University of Bengkulu
Dadin Mars Abimayu Geophysics Program, Faculty of Mathematics and Natural Science, University of Bengkulu
Naela Sahada Salsabila Geophysics Program, Faculty of Mathematics and Natural Science, University of Bengkulu
Adrian Daniel Geophysics Program, Faculty of Mathematics and Natural Science, University of Bengkulu

DOI: https://doi.org/10.23960/jgrs.ft.unila.517

Keywords: DEMNAS, morphometric analysis, mount dempo, stress orientation, σHmax

Abstract

Mount Dempo in South Sumatra lies within the Bukit Barisan volcanic arc, where interactions between volcanism and the Sumatra Fault Zone remain poorly understood. This study presents the first systematic morphometric assessment to determine the maximum horizontal stress (σHmax) orientation at Mount Dempo using high-resolution DEMNAS data and GIS-based analysis. Crater elongation, breach azimuth, and parasitic cone alignments from monogenetic features were measured—each azimuth recorded three times per feature to ensure precision. Statistical evaluation using the circular mean and Rayleigh test reveals a dominant σHmax orientation of 138° ± 12° (SE–NW), consistent with the oblique convergence between the Indo-Australian and Eurasian plates. These findings provide new quantitative constraints on stress-controlled magma migration pathways and contribute to the World Stress Map database for volcanic regions in Southeast Asia. The results also support improved volcanic hazard assessment frameworks in tectonically complex terrains.

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