BackgroundExcept for the upper parts of the slope, the flanks are vegetated. At the ash covered summit, Bola contains a 400 m wide crater with a 100 m steep cliff on the eastern side and almost no inner wall on the western side. There are active fumaroles in the crater.
The eastern half of the Bola has steep ash slopes. 3 large explosion craters are located on the lower NE flank. Andesite lava flows are located on the western side of the mountain.
The most recent eruptions were lava flows from the summit crater. The flows are at least 50 m thick, and give the volcano a hump when viewed from the north or south.
(Smithsonian / GVP volcano information)
The glow from the lava lake is so strong, that it is impossible to photograph parabola of flying bombs. (Photo: Tom Pfeiffer)
The trajectory of the fire hose is a gently curved perfect steep parabola following the laws of ballistic trajectories. (Photo: Tom Pfeiffer)
Pieces of lava are flying from the vent in a parabola above the lava lake. (Photo: Tom Pfeiffer)
See also: Sentinel hub | Landsat 8 | NASA FIRMS