Gedemsa
About Gedemsa
The Gedemsa caldera covers 7 x 9 km along the Main Ethiopian Rift E of Lake Koka and SW of Wonji Sugar Estate Farm. The steep-sided edifice has walls 100-200 m high whose upper part consists primarily of rhyolitic lava flows, formed by the eruption of a series of trachytic ignimbrites, It is also cut by many NNE-SSW-trending regional faults, particularly on the E side. Late-Pleistocene to Holocene volcanics form a chain of rhyolitic lava flows and pumice deposits, known as Ittisa, that rises above the floor of the caldera. A large 1-km-wide crater is located at the eastern part of the chain. A Holocene lava dome or flow is found on the SW flank. Small basaltic spatter cones have formed inside the caldera rim. Weak fumarolic activity was reported at two locations.
Eruption reports
Reports from GDACS and NASA EONET linked to this volcano.
No eruption reports in our records yet. New reports appear here automatically.
Earthquakes nearby, 30 days
Within about 50 km. Swarms of small quakes can sometimes accompany volcanic unrest.
No earthquakes recorded nearby in the last 30 days.