The Prahu stratovolcano was truncated by a large Pleistocene caldera and then filled by parasitic cones, lava domes and craters which is 120° celsius.
The Prahu stratovolcano's growth was halted by a large Pleistocene caldera, which was then occupied by smaller volcanic features like parasitic cones, lava domes, and craters, leading to unusually high temperatures of 120° Celsius.