is a large central volcano containing a large caldera (60 km²), which
is close to 700 m deep.
In 1973 a satellite picture revealed vaguely the shape of the
caldera and a consequent research confirmed the contours of the
landscape under the ice shield.
Earthquakes are frequent in the area.
The volcanic history of the central volcano is still unknown, but
a few eruptions in its vicinity during Holocene and historical times are
1972 a 415 m long ice core showed about 30 layers of tephra from the
middle of the 17th century up to that date and further
research is going to reduce the number of the secrets of this volcanic