Surface expressions of morphostructural features at Hasandağ stratovolcano on DEM datasets

Abstract

Although the young pyroclastic cover tends to hide the structural features, derivatives of Digital Elevation Models (DEM) help reveal the morphological elements exposing the structure of the volcanoes. While the shaded relief maps improve the visuality of the DEM data, they are not the best derivatives to express the detailed morphological characteristics of the terrain. Advanced morphometric DEM derivatives, such as Red Relief Image Maps and Openness images, provide improved terrain legibility especially on volcanic landforms. Satellite-derived mid-resolution DEM and very-high-resolution aerial stereo-photogrammetric summit model of Hasandağ was used to investigate the structural features of the volcano. The mid-resolution topographic derivatives evidently mapped structural features which have had important role in the evolution of the volcano. Effect of fault systems on the development of the volcano, evident and probable topographic rims of collapse structures, avalanche and lava flow surface morphologies and characteristics revealed by the advanced derivatives of DEMs were evaluated. Summit of Greater Hasandağ volcano was modeled using Structure-from-Motion/Multiview stereophotogrammetry using acquired drone imagery; the model presents the summit geology in high-resolution and precision.

Volcanic unrest possibilities in response to recent Obruk seismic swarm on and around Hasandağ stratovolcano (Central Anatolia, Turkey)

“…Hasandag is an active/subactive volcano having summit fumarole activities [Aydar, 1992, Aydar andGourgaud, 1998]. Diker et al [2018] worked on hydrothermal activities of Hasandag with self-potential, surface temperature and CO 2 measurements and they relate those activities with structural discontinuities [Ulusoy et al, 2021] on the volcano. They concluded that the hydrothermal zone starts above 2250 m; on the summit zone, fumaroles, hot grounds, and water Erkan Aydar et al…”

Reconstructing the Belbaşhanı Pumice Plinian eruption, Hasandağ Volcano, Turkey

“…8), the vent of the Belbaşhanı Pumice eruption was located near the intersection of the Tuz Gölü fault and the Ulukışla caldera (Fig. 1c; Ulusoy et al 2021;Diker et al 2024). Isomaps indicate that volcanic material was dispersed towards the northeast.…”

“…1c) is covered by a debris-avalanche deposit forming a hummocky terrain between the Hasandağ volcano and Ihlara river (Fig. 1c; Kuzucuoğlu et al 2020;Ulusoy et al 2021). Parts of this avalanche deposit are distributed within the Kitreli basin, which lies towards the northeast of Hasandağ and spans the territory between the towns of Yenipınar, Ihlara, and Kitreli (Fig.…”

“…1a, b) since the middle Pleistocene (e.g., Friedrichs et al 2020a). The volcano is currently experiencing an increase in local seismicity with an ongoing fumarolic activity over the last years (Ulusoy et al 2021), thus posing a threat for future eruptive activity. This unrest holds particular significance when considering the mid-to-upper crustal low-seismic velocity zones, which could suggest the presence of potentially eruptible magma beneath the volcano (e.g., Abgarmi et al 2017;Friedrichs et al 2021;Tank and Karaş, 2020).…”

Investigating Stress Transfer Between the Tuz Gölü Fault Zone and Hasan Dağ Volcano (Turkey)

“…Moment magnitude of earthquake (M w ), horizontal distance (D) distance between earthquake epicenter and volcanic system. and fumarolic degassing on its western flank with temperatures of up to 68.7 °C and CO 2 levels ∼10,000 ppm are indicative of the presence of an active magmatic system (Dİker et al, 2018;Ulusoy et al, 2020;Aydar et al, 2021). Mid-crustal low-seismic velocity layers beneath the volcanic province may represent magma reservoirs feeding active surface volcanism (Abgarmi et al, 2017).…”