Sif Mons

Description

Sif Mons is a large shield volcano located in western Eistla Regio, a highland region on Venus. It is composed of a main volcanic structure with a 40-kilometre (25 mi) wide summit caldera surrounded by an outer apron of lava flows 1,200 kilometres (750 mi) in diameter. It rises about 2 kilometres (1.2 mi) from its base. It is one of a few extraterrestrial volcanoes where signs of ongoing volcanic activity have been observed, with candidate eruptions in 1990 and 1992. It is named after the Norse goddess Sif; the name Sif Mons was officially adopted by the International Astronomical Union (IAU) in 1982.