In Turkey, the record of earthquakes with the use of devices began in 1900. On September 20, 2020, an earthquake of Mw 5.1 happened near Obruk village of Nigde-Bor province (Central Anatolia, Turkey) and a swarm consisting of >100 aftershocks continued for one month. This swarm happened in an area where no seismic activity had been recorded before, according to the earthquake catalog covering the period 1900-2020. The area concerned is known for its monogenetic volcano sequences and is located immediately south of the active Hasandag volcano of the Central Anatolian Volcanic Province, Turkey. In this paper, we reported a volcano-structural interpretation of the seismic events, and evaluate the volcanic unrest possibilities related to the seismic activity on and around Hasandag.

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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.

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