Acigol-Nevsehir Volcano - John Seach



38.57 N, 34.52 E
summit elevation 1689 m
Caldera, Maars

Acigol-Nevsehir Volcano is located in central Turkey between the towns of Nevaehir and Acigol.

The volcano contains a 8 x 7 km wide caldera, lava flows, maars, lava domes, and pyroclastic cones. Acigol caldera (Kocadag caldera) contains steep, fresh collapse scarps up to 150 m high which are broadly concentric about the dome of
Kocadag Tepe.

Eruptions at the volcano have been explosive.

Acigol volcano has produced two major rhyolitic explosive eruptions in the last 180,000 years. Both produced Plinian type eruptions, and generated extensive ignimbrite. Fallout from the eruptions reached 35 km to the NE of the volcano.

Eruptions 20,000 years ago
Eruption of the domes of Korudagi, Giineydag, Kaleci, Kuzay, Karniyarik and associated tuff cones. Eruption of the Korudagi Tuff. Formation of the Acigol maars.

Eruption 70,000 years ago
Extrusion of the Kocadag dome.

Eruptions 70,000 to 150,000 years ago
Eruption of Upper Acigol Tuff from the Kocadag vent, producing a major Plinian
pumice, widespread ignimbrite, and a thick fallout and surge.

Eruptions 150,000 to 180,000 years ago
Extrusion of the Bogazkoy Obsidian, Taskesik dome, Vigla Tepe dome, and Tepekoy dome.

Eruptions before 180,000 years ago
Eruption of the Lower Acigol Tuff from a vent located near Kocadag Tepe.

Acigol-Nevsehir Volcano Eruptions

2080 BC ± 200, 2370 BC ± 200, 3500 BC?, 6230 BC?, 7810 BC?