Mandalagan VulkanMandalagan volcano in northern Negros Island, Central Philippines, is an eroded dominantly andesitic-dacitic volcanic complex. It is formed by 7 volcanic edifices and has at least 5 craters of up to 2 km in diameter, some of which are probably calderas. The age of its last eruptions, which produced a thin basalt lava flow, is unknown.
Mandalagan has very active fumaroles in at least 11 locations.
One fumarole field is particularly powerful. It emits a high-temperature (106 degrees C) plume to 30 m height accompanied by a roaring noise like a high-pressure geothermal borehole.
Mandalagan volcano is part of the northern Negros volcanic arc which also contains Mt Silay (1534 m), Mt Kanlaon (2465 m). Mt Mandalagan volcanoes.