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Sentinel-2B liber Emi Koussi 
Aufgenommen am 27. November 2017 
„Reminiscent of an artist's pallet, this is the Emi Koussi volcano in northern Chad, imaged by the 
Copernicus Sentinel-2B satellite. 
Emi Koussi lies at the southeast end of the Tibesti Mountains. At almost 3500 m, this pyroclastic 
shield volcano rises high above the surrounding sandstone plains. It is not only the highest mountain 
in Chad, but also the highest in the Sahara. Calderas, or depressions, can be seen nestling in the cap 
of the volcano. These are a result of magma erupting quickly and the surface collapsing into the 
partially emptied magma chamber. Emi Koussi is extinct and it is not known when it last erupted. 
The lack of vegetation allows wind and water to carve long grooves in the rock. These grooves can be 
30 metres deep and several kilometres long. 
The Copernicus Sentinel-2 satellites carry innovative high-resolution multispectral cameras with 13 
spectral bands. Processing the image here reveals differences in the minerals of the rock. For 
example, the green around the cone of the volcano is old lava, while sandstone in the surrounding 
area appear in reds and yellows." 
Weblink: https://www.esa.int/spaceinimages/lmages/2018/05/Emi_Koussi